Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

125 files changed, 21605 insertions, 0 deletions

diff --git a/dom/media/gmp/CDMStorageIdProvider.cpp b/dom/media/gmp/CDMStorageIdProvider.cpp
new file mode 100644
index 0000000000..52255879b3
--- /dev/null
+++ b/dom/media/gmp/CDMStorageIdProvider.cpp
@@ -0,0 +1,68 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "CDMStorageIdProvider.h"
+#include "GMPLog.h"
+#include "nsCOMPtr.h"
+#include "nsComponentManagerUtils.h"
+#include "nsICryptoHash.h"
+
+#ifdef SUPPORT_STORAGE_ID
+#  include "rlz/lib/machine_id.h"
+#endif
+
+namespace mozilla {
+
+/*static*/
+nsCString CDMStorageIdProvider::ComputeStorageId(const nsCString& aOriginSalt) {
+#ifndef SUPPORT_STORAGE_ID
+  return ""_ns;
+#else
+  GMP_LOG_DEBUG("CDMStorageIdProvider::ComputeStorageId");
+
+  std::string machineId;
+  if (!rlz_lib::GetMachineId(&machineId)) {
+    GMP_LOG_DEBUG(
+        "CDMStorageIdProvider::ComputeStorageId: get machineId failed.");
+    return ""_ns;
+  }
+
+  std::string originSalt(aOriginSalt.BeginReading(), aOriginSalt.Length());
+  std::string input =
+      machineId + originSalt + CDMStorageIdProvider::kBrowserIdentifier;
+  nsCOMPtr<nsICryptoHash> hasher;
+  nsresult rv = NS_NewCryptoHash(nsICryptoHash::SHA256, getter_AddRefs(hasher));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    GMP_LOG_DEBUG(
+        "CDMStorageIdProvider::ComputeStorageId: failed to initialize "
+        "hash(0x%08" PRIx32 ")",
+        static_cast<uint32_t>(rv));
+    return ""_ns;
+  }
+
+  rv = hasher->Update(reinterpret_cast<const uint8_t*>(input.c_str()),
+                      input.size());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    GMP_LOG_DEBUG(
+        "CDMStorageIdProvider::ComputeStorageId: failed to update "
+        "hash(0x%08" PRIx32 ")",
+        static_cast<uint32_t>(rv));
+    return ""_ns;
+  }
+
+  nsCString storageId;
+  rv = hasher->Finish(false, storageId);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    GMP_LOG_DEBUG(
+        "CDMStorageIdProvider::ComputeStorageId: failed to get the final hash "
+        "result(0x%08" PRIx32 ")",
+        static_cast<uint32_t>(rv));
+    return ""_ns;
+  }
+  return storageId;
+#endif
+}
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/CDMStorageIdProvider.h b/dom/media/gmp/CDMStorageIdProvider.h
new file mode 100644
index 0000000000..6904792607
--- /dev/null
+++ b/dom/media/gmp/CDMStorageIdProvider.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef CDMStorageIdProvider_h_
+#define CDMStorageIdProvider_h_
+
+/**
+ * CDM will try to request a latest version(0) of storage id.
+ * If the storage id computation algorithm changed, we should increase the
+ * kCurrentVersion.
+ */
+
+#include <string>
+
+#include "nsString.h"
+
+namespace mozilla {
+
+class CDMStorageIdProvider {
+  static constexpr const char* kBrowserIdentifier = "mozilla_firefox_gecko";
+
+ public:
+  // Should increase the value when the storage id algorithm changed.
+  static constexpr int kCurrentVersion = 1;
+  static constexpr int kCDMRequestLatestVersion = 0;
+
+  // Return empty string when
+  // 1. Call on unsupported storageid platform.
+  // 2. Failed to compute the storage id.
+  // This function only provide the storage id for kCurrentVersion=1.
+  // If you want to change the algorithm or output of storageid,
+  // you should keep the version 1 storage id and consider to provide
+  // higher version storage id in another function.
+  static nsCString ComputeStorageId(const nsCString& aOriginSalt);
+};
+
+}  // namespace mozilla
+
+#endif  // CDMStorageIdProvider_h_
diff --git a/dom/media/gmp/ChromiumCDMAdapter.cpp b/dom/media/gmp/ChromiumCDMAdapter.cpp
new file mode 100644
index 0000000000..74197c882a
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMAdapter.cpp
@@ -0,0 +1,304 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ChromiumCDMAdapter.h"
+
+#include <utility>
+
+#include "GMPLog.h"
+#include "WidevineUtils.h"
+#include "content_decryption_module.h"
+#include "content_decryption_module_ext.h"
+#include "gmp-api/gmp-entrypoints.h"
+#include "gmp-api/gmp-video-codec.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/HelperMacros.h"
+#include "mozilla/dom/KeySystemNames.h"
+
+#ifdef XP_WIN
+#  include "WinUtils.h"
+#  include "nsWindowsDllInterceptor.h"
+#  include <windows.h>
+#  include <strsafe.h>
+#  include <unordered_map>
+#  include <vector>
+#else
+#  include <sys/types.h>
+#  include <sys/stat.h>
+#  include <unistd.h>
+#  include <fcntl.h>
+#endif
+
+const GMPPlatformAPI* sPlatform = nullptr;
+
+namespace mozilla {
+
+#ifdef XP_WIN
+static void InitializeHooks();
+#endif
+
+ChromiumCDMAdapter::ChromiumCDMAdapter(
+    nsTArray<std::pair<nsCString, nsCString>>&& aHostPathPairs) {
+#ifdef XP_WIN
+  InitializeHooks();
+#endif
+  PopulateHostFiles(std::move(aHostPathPairs));
+}
+
+void ChromiumCDMAdapter::SetAdaptee(PRLibrary* aLib) { mLib = aLib; }
+
+void* ChromiumCdmHost(int aHostInterfaceVersion, void* aUserData) {
+  GMP_LOG_DEBUG("ChromiumCdmHostFunc(%d, %p)", aHostInterfaceVersion,
+                aUserData);
+  if (aHostInterfaceVersion != cdm::Host_10::kVersion) {
+    return nullptr;
+  }
+  return aUserData;
+}
+
+#ifdef MOZILLA_OFFICIAL
+static cdm::HostFile TakeToCDMHostFile(HostFileData& aHostFileData) {
+  return cdm::HostFile(aHostFileData.mBinary.Path().get(),
+                       aHostFileData.mBinary.TakePlatformFile(),
+                       aHostFileData.mSig.TakePlatformFile());
+}
+#endif
+
+GMPErr ChromiumCDMAdapter::GMPInit(const GMPPlatformAPI* aPlatformAPI) {
+  GMP_LOG_DEBUG("ChromiumCDMAdapter::GMPInit");
+  sPlatform = aPlatformAPI;
+  if (!mLib) {
+    return GMPGenericErr;
+  }
+
+#ifdef MOZILLA_OFFICIAL
+  // Note: we must call the VerifyCdmHost_0 function if it's present before
+  // we call the initialize function.
+  auto verify = reinterpret_cast<decltype(::VerifyCdmHost_0)*>(
+      PR_FindFunctionSymbol(mLib, MOZ_STRINGIFY(VerifyCdmHost_0)));
+  if (verify) {
+    nsTArray<cdm::HostFile> files;
+    for (HostFileData& hostFile : mHostFiles) {
+      files.AppendElement(TakeToCDMHostFile(hostFile));
+    }
+    bool result = verify(files.Elements(), files.Length());
+    GMP_LOG_DEBUG("%s VerifyCdmHost_0 returned %d", __func__, result);
+  }
+#endif
+
+  auto init = reinterpret_cast<decltype(::INITIALIZE_CDM_MODULE)*>(
+      PR_FindFunctionSymbol(mLib, MOZ_STRINGIFY(INITIALIZE_CDM_MODULE)));
+  if (!init) {
+    return GMPGenericErr;
+  }
+
+  GMP_LOG_DEBUG(MOZ_STRINGIFY(INITIALIZE_CDM_MODULE) "()");
+  init();
+
+  return GMPNoErr;
+}
+
+GMPErr ChromiumCDMAdapter::GMPGetAPI(const char* aAPIName, void* aHostAPI,
+                                     void** aPluginAPI,
+                                     const nsACString& aKeySystem) {
+  MOZ_ASSERT(
+      aKeySystem.EqualsLiteral(kWidevineKeySystemName) ||
+          aKeySystem.EqualsLiteral(kClearKeyKeySystemName) ||
+          aKeySystem.EqualsLiteral(kClearKeyWithProtectionQueryKeySystemName) ||
+          aKeySystem.EqualsLiteral("fake"),
+      "Should not get an unrecognized key system. Why didn't it get "
+      "blocked by MediaKeySystemAccess?");
+  GMP_LOG_DEBUG("ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p, %s) this=0x%p",
+                aAPIName, aHostAPI, aPluginAPI,
+                PromiseFlatCString(aKeySystem).get(), this);
+  bool isCdm10 = !strcmp(aAPIName, CHROMIUM_CDM_API);
+
+  if (!isCdm10) {
+    MOZ_ASSERT_UNREACHABLE("We only support and expect cdm10!");
+    GMP_LOG_DEBUG(
+        "ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p) this=0x%p got "
+        "unsupported CDM version!",
+        aAPIName, aHostAPI, aPluginAPI, this);
+    return GMPGenericErr;
+  }
+  auto create = reinterpret_cast<decltype(::CreateCdmInstance)*>(
+      PR_FindFunctionSymbol(mLib, "CreateCdmInstance"));
+  if (!create) {
+    GMP_LOG_DEBUG(
+        "ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p) this=0x%p "
+        "FAILED to find CreateCdmInstance",
+        aAPIName, aHostAPI, aPluginAPI, this);
+    return GMPGenericErr;
+  }
+
+  const int version = cdm::ContentDecryptionModule_10::kVersion;
+  void* cdm = create(version, aKeySystem.BeginReading(), aKeySystem.Length(),
+                     &ChromiumCdmHost, aHostAPI);
+  if (!cdm) {
+    GMP_LOG_DEBUG(
+        "ChromiumCDMAdapter::GMPGetAPI(%s, 0x%p, 0x%p) this=0x%p "
+        "FAILED to create cdm version %d",
+        aAPIName, aHostAPI, aPluginAPI, this, version);
+    return GMPGenericErr;
+  }
+  GMP_LOG_DEBUG("cdm: 0x%p, version: %d", cdm, version);
+  *aPluginAPI = cdm;
+
+  return *aPluginAPI ? GMPNoErr : GMPNotImplementedErr;
+}
+
+void ChromiumCDMAdapter::GMPShutdown() {
+  GMP_LOG_DEBUG("ChromiumCDMAdapter::GMPShutdown()");
+
+  decltype(::DeinitializeCdmModule)* deinit;
+  deinit =
+      (decltype(deinit))(PR_FindFunctionSymbol(mLib, "DeinitializeCdmModule"));
+  if (deinit) {
+    GMP_LOG_DEBUG("DeinitializeCdmModule()");
+    deinit();
+  }
+}
+
+/* static */
+bool ChromiumCDMAdapter::Supports(int32_t aModuleVersion,
+                                  int32_t aInterfaceVersion,
+                                  int32_t aHostVersion) {
+  return aModuleVersion == CDM_MODULE_VERSION &&
+         aInterfaceVersion == cdm::ContentDecryptionModule_10::kVersion &&
+         aHostVersion == cdm::Host_10::kVersion;
+}
+
+#ifdef XP_WIN
+
+static WindowsDllInterceptor sKernel32Intercept;
+
+typedef DWORD(WINAPI* QueryDosDeviceWFnPtr)(_In_opt_ LPCWSTR lpDeviceName,
+                                            _Out_ LPWSTR lpTargetPath,
+                                            _In_ DWORD ucchMax);
+
+static WindowsDllInterceptor::FuncHookType<QueryDosDeviceWFnPtr>
+    sOriginalQueryDosDeviceWFnPtr;
+
+static std::unordered_map<std::wstring, std::wstring>* sDeviceNames = nullptr;
+
+DWORD WINAPI QueryDosDeviceWHook(LPCWSTR lpDeviceName, LPWSTR lpTargetPath,
+                                 DWORD ucchMax) {
+  if (!sDeviceNames) {
+    return 0;
+  }
+  std::wstring name = std::wstring(lpDeviceName);
+  auto iter = sDeviceNames->find(name);
+  if (iter == sDeviceNames->end()) {
+    return 0;
+  }
+  const std::wstring& device = iter->second;
+  if (device.size() + 1 > ucchMax) {
+    return 0;
+  }
+  PodCopy(lpTargetPath, device.c_str(), device.size());
+  lpTargetPath[device.size()] = 0;
+  GMP_LOG_DEBUG("QueryDosDeviceWHook %S -> %S", lpDeviceName, lpTargetPath);
+  return device.size();
+}
+
+static std::vector<std::wstring> GetDosDeviceNames() {
+  std::vector<std::wstring> v;
+  std::vector<wchar_t> buf;
+  buf.resize(1024);
+  DWORD rv = GetLogicalDriveStringsW(buf.size(), buf.data());
+  if (rv == 0 || rv > buf.size()) {
+    return v;
+  }
+
+  // buf will be a list of null terminated strings, with the last string
+  // being 0 length.
+  const wchar_t* p = buf.data();
+  const wchar_t* end = &buf.back();
+  size_t l;
+  while (p < end && (l = wcsnlen_s(p, end - p)) > 0) {
+    // The string is of the form "C:\". We need to strip off the trailing
+    // backslash.
+    std::wstring drive = std::wstring(p, p + l);
+    if (drive.back() == '\\') {
+      drive.erase(drive.end() - 1);
+    }
+    v.push_back(std::move(drive));
+    p += l + 1;
+  }
+  return v;
+}
+
+static std::wstring GetDeviceMapping(const std::wstring& aDosDeviceName) {
+  wchar_t buf[MAX_PATH] = {0};
+  DWORD rv = QueryDosDeviceW(aDosDeviceName.c_str(), buf, MAX_PATH);
+  if (rv == 0) {
+    return std::wstring(L"");
+  }
+  return std::wstring(buf, buf + rv);
+}
+
+static void InitializeHooks() {
+  static bool initialized = false;
+  if (initialized) {
+    return;
+  }
+  initialized = true;
+  sDeviceNames = new std::unordered_map<std::wstring, std::wstring>();
+  for (const std::wstring& name : GetDosDeviceNames()) {
+    sDeviceNames->emplace(name, GetDeviceMapping(name));
+  }
+
+  sKernel32Intercept.Init("kernelbase.dll");
+  sOriginalQueryDosDeviceWFnPtr.Set(sKernel32Intercept, "QueryDosDeviceW",
+                                    &QueryDosDeviceWHook);
+}
+#endif
+
+HostFile::HostFile(HostFile&& aOther)
+    : mPath(aOther.mPath), mFile(aOther.TakePlatformFile()) {}
+
+HostFile::~HostFile() {
+  if (mFile != cdm::kInvalidPlatformFile) {
+#ifdef XP_WIN
+    CloseHandle(mFile);
+#else
+    close(mFile);
+#endif
+    mFile = cdm::kInvalidPlatformFile;
+  }
+}
+
+#ifdef XP_WIN
+HostFile::HostFile(const nsCString& aPath)
+    : mPath(NS_ConvertUTF8toUTF16(aPath)) {
+  HANDLE handle =
+      CreateFileW(mPath.get(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
+                  NULL, OPEN_EXISTING, 0, NULL);
+  mFile = (handle == INVALID_HANDLE_VALUE) ? cdm::kInvalidPlatformFile : handle;
+}
+#endif
+
+#ifndef XP_WIN
+HostFile::HostFile(const nsCString& aPath) : mPath(aPath) {
+  // Note: open() returns -1 on failure; i.e. kInvalidPlatformFile.
+  mFile = open(aPath.get(), O_RDONLY);
+}
+#endif
+
+cdm::PlatformFile HostFile::TakePlatformFile() {
+  cdm::PlatformFile f = mFile;
+  mFile = cdm::kInvalidPlatformFile;
+  return f;
+}
+
+void ChromiumCDMAdapter::PopulateHostFiles(
+    nsTArray<std::pair<nsCString, nsCString>>&& aHostPathPairs) {
+  for (const auto& pair : aHostPathPairs) {
+    mHostFiles.AppendElement(HostFileData(mozilla::HostFile(pair.first),
+                                          mozilla::HostFile(pair.second)));
+  }
+}
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/ChromiumCDMAdapter.h b/dom/media/gmp/ChromiumCDMAdapter.h
new file mode 100644
index 0000000000..747345fb27
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMAdapter.h
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ChromiumAdapter_h_
+#define ChromiumAdapter_h_
+
+#include "GMPLoader.h"
+#include "prlink.h"
+#include "GMPUtils.h"
+#include "nsTArray.h"
+#include "content_decryption_module_ext.h"
+#include "nsString.h"
+
+#include <utility>
+
+struct GMPPlatformAPI;
+
+namespace mozilla {
+
+#if defined(XP_WIN)
+typedef nsString HostFileString;
+#else
+typedef nsCString HostFileString;
+#endif
+
+class HostFile {
+ public:
+  explicit HostFile(const nsCString& aPath);
+  HostFile(HostFile&& aOther);
+  ~HostFile();
+
+  const HostFileString& Path() const { return mPath; }
+  cdm::PlatformFile TakePlatformFile();
+
+ private:
+  const HostFileString mPath;
+  cdm::PlatformFile mFile = cdm::kInvalidPlatformFile;
+};
+
+struct HostFileData {
+  HostFileData(HostFile&& aBinary, HostFile&& aSig)
+      : mBinary(std::move(aBinary)), mSig(std::move(aSig)) {}
+
+  HostFileData(HostFileData&& aOther)
+      : mBinary(std::move(aOther.mBinary)), mSig(std::move(aOther.mSig)) {}
+
+  ~HostFileData() = default;
+
+  HostFile mBinary;
+  HostFile mSig;
+};
+
+class ChromiumCDMAdapter : public gmp::GMPAdapter {
+ public:
+  explicit ChromiumCDMAdapter(
+      nsTArray<std::pair<nsCString, nsCString>>&& aHostPathPairs);
+
+  void SetAdaptee(PRLibrary* aLib) override;
+
+  // These are called in place of the corresponding GMP API functions.
+  GMPErr GMPInit(const GMPPlatformAPI* aPlatformAPI) override;
+  GMPErr GMPGetAPI(const char* aAPIName, void* aHostAPI, void** aPluginAPI,
+                   const nsACString& aKeySystem) override;
+  void GMPShutdown() override;
+
+  static bool Supports(int32_t aModuleVersion, int32_t aInterfaceVersion,
+                       int32_t aHostVersion);
+
+ private:
+  void PopulateHostFiles(
+      nsTArray<std::pair<nsCString, nsCString>>&& aHostFilePaths);
+
+  PRLibrary* mLib = nullptr;
+  nsTArray<HostFileData> mHostFiles;
+};
+
+}  // namespace mozilla
+
+#endif  // ChromiumAdapter_h_
diff --git a/dom/media/gmp/ChromiumCDMCallback.h b/dom/media/gmp/ChromiumCDMCallback.h
new file mode 100644
index 0000000000..3f62634933
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMCallback.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ChromiumCDMCallback_h_
+#define ChromiumCDMCallback_h_
+
+#include "mozilla/CDMProxy.h"
+#include "mozilla/dom/MediaKeyStatusMapBinding.h"     // For MediaKeyStatus
+#include "mozilla/dom/MediaKeyMessageEventBinding.h"  // For MediaKeyMessageType
+#include "mozilla/gmp/GMPTypes.h"                     // For CDMKeyInformation
+
+namespace mozilla {
+class ErrorResult;
+}
+
+class ChromiumCDMCallback {
+ public:
+  virtual ~ChromiumCDMCallback() = default;
+
+  virtual void SetSessionId(uint32_t aPromiseId,
+                            const nsCString& aSessionId) = 0;
+
+  virtual void ResolveLoadSessionPromise(uint32_t aPromiseId,
+                                         bool aSuccessful) = 0;
+
+  virtual void ResolvePromiseWithKeyStatus(uint32_t aPromiseId,
+                                           uint32_t aKeyStatus) = 0;
+
+  virtual void ResolvePromise(uint32_t aPromiseId) = 0;
+
+  virtual void RejectPromise(uint32_t aPromiseId, mozilla::ErrorResult&& aError,
+                             const nsCString& aErrorMessage) = 0;
+
+  virtual void SessionMessage(const nsACString& aSessionId,
+                              uint32_t aMessageType,
+                              nsTArray<uint8_t>&& aMessage) = 0;
+
+  virtual void SessionKeysChange(
+      const nsCString& aSessionId,
+      nsTArray<mozilla::gmp::CDMKeyInformation>&& aKeysInfo) = 0;
+
+  virtual void ExpirationChange(const nsCString& aSessionId,
+                                double aSecondsSinceEpoch) = 0;
+
+  virtual void SessionClosed(const nsCString& aSessionId) = 0;
+
+  virtual void QueryOutputProtectionStatus() = 0;
+
+  virtual void Terminated() = 0;
+
+  virtual void Shutdown() = 0;
+};
+
+#endif
diff --git a/dom/media/gmp/ChromiumCDMCallbackProxy.cpp b/dom/media/gmp/ChromiumCDMCallbackProxy.cpp
new file mode 100644
index 0000000000..481534c0e4
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMCallbackProxy.cpp
@@ -0,0 +1,159 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ChromiumCDMCallbackProxy.h"
+
+#include <type_traits>
+
+#include "ChromiumCDMProxy.h"
+#include "content_decryption_module.h"
+
+namespace mozilla {
+
+template <class Func, class... Args>
+void ChromiumCDMCallbackProxy::DispatchToMainThread(const char* const aLabel,
+                                                    Func aFunc,
+                                                    Args&&... aArgs) {
+  mMainThread->Dispatch(
+      // Use decay to ensure all the types are passed by value not by reference.
+      NewRunnableMethod<std::decay_t<Args>...>(aLabel, mProxy, aFunc,
+                                               std::forward<Args>(aArgs)...),
+      NS_DISPATCH_NORMAL);
+}
+
+void ChromiumCDMCallbackProxy::SetSessionId(uint32_t aPromiseId,
+                                            const nsCString& aSessionId) {
+  DispatchToMainThread("ChromiumCDMProxy::OnSetSessionId",
+                       &ChromiumCDMProxy::OnSetSessionId, aPromiseId,
+                       NS_ConvertUTF8toUTF16(aSessionId));
+}
+
+void ChromiumCDMCallbackProxy::ResolveLoadSessionPromise(uint32_t aPromiseId,
+                                                         bool aSuccessful) {
+  DispatchToMainThread("ChromiumCDMProxy::OnResolveLoadSessionPromise",
+                       &ChromiumCDMProxy::OnResolveLoadSessionPromise,
+                       aPromiseId, aSuccessful);
+}
+
+void ChromiumCDMCallbackProxy::ResolvePromise(uint32_t aPromiseId) {
+  DispatchToMainThread("ChromiumCDMProxy::ResolvePromise",
+                       &ChromiumCDMProxy::ResolvePromise, aPromiseId);
+}
+
+void ChromiumCDMCallbackProxy::RejectPromise(uint32_t aPromiseId,
+                                             ErrorResult&& aException,
+                                             const nsCString& aErrorMessage) {
+  // Use CopyableErrorResult to store our exception in the runnable,
+  // because ErrorResult is not OK to move across threads.
+  DispatchToMainThread<decltype(&ChromiumCDMProxy::RejectPromiseOnMainThread),
+                       int32_t, StoreCopyPassByRRef<CopyableErrorResult>,
+                       const nsCString&>(
+      "ChromiumCDMProxy::RejectPromise",
+      &ChromiumCDMProxy::RejectPromiseOnMainThread, aPromiseId,
+      std::move(aException), aErrorMessage);
+}
+
+static dom::MediaKeyMessageType ToDOMMessageType(uint32_t aMessageType) {
+  switch (static_cast<cdm::MessageType>(aMessageType)) {
+    case cdm::kLicenseRequest:
+      return dom::MediaKeyMessageType::License_request;
+    case cdm::kLicenseRenewal:
+      return dom::MediaKeyMessageType::License_renewal;
+    case cdm::kLicenseRelease:
+      return dom::MediaKeyMessageType::License_release;
+    case cdm::kIndividualizationRequest:
+      return dom::MediaKeyMessageType::Individualization_request;
+  }
+  MOZ_ASSERT_UNREACHABLE("Invalid cdm::MessageType enum value.");
+  return dom::MediaKeyMessageType::License_request;
+}
+
+void ChromiumCDMCallbackProxy::SessionMessage(const nsACString& aSessionId,
+                                              uint32_t aMessageType,
+                                              nsTArray<uint8_t>&& aMessage) {
+  DispatchToMainThread("ChromiumCDMProxy::OnSessionMessage",
+                       &ChromiumCDMProxy::OnSessionMessage,
+                       NS_ConvertUTF8toUTF16(aSessionId),
+                       ToDOMMessageType(aMessageType), std::move(aMessage));
+}
+
+static dom::MediaKeyStatus ToDOMMediaKeyStatus(uint32_t aStatus) {
+  switch (static_cast<cdm::KeyStatus>(aStatus)) {
+    case cdm::kUsable:
+      return dom::MediaKeyStatus::Usable;
+    case cdm::kInternalError:
+      return dom::MediaKeyStatus::Internal_error;
+    case cdm::kExpired:
+      return dom::MediaKeyStatus::Expired;
+    case cdm::kOutputRestricted:
+      return dom::MediaKeyStatus::Output_restricted;
+    case cdm::kOutputDownscaled:
+      return dom::MediaKeyStatus::Output_downscaled;
+    case cdm::kStatusPending:
+      return dom::MediaKeyStatus::Status_pending;
+    case cdm::kReleased:
+      return dom::MediaKeyStatus::Released;
+  }
+  MOZ_ASSERT_UNREACHABLE("Invalid cdm::KeyStatus enum value.");
+  return dom::MediaKeyStatus::Internal_error;
+}
+
+void ChromiumCDMCallbackProxy::ResolvePromiseWithKeyStatus(
+    uint32_t aPromiseId, uint32_t aKeyStatus) {
+  DispatchToMainThread("ChromiumCDMProxy::OnResolvePromiseWithKeyStatus",
+                       &ChromiumCDMProxy::OnResolvePromiseWithKeyStatus,
+                       aPromiseId, ToDOMMediaKeyStatus(aKeyStatus));
+}
+
+void ChromiumCDMCallbackProxy::SessionKeysChange(
+    const nsCString& aSessionId,
+    nsTArray<mozilla::gmp::CDMKeyInformation>&& aKeysInfo) {
+  bool keyStatusesChange = false;
+  {
+    auto caps = mProxy->Capabilites().Lock();
+    for (const auto& keyInfo : aKeysInfo) {
+      keyStatusesChange |= caps->SetKeyStatus(
+          keyInfo.mKeyId(), NS_ConvertUTF8toUTF16(aSessionId),
+          dom::Optional<dom::MediaKeyStatus>(
+              ToDOMMediaKeyStatus(keyInfo.mStatus())));
+    }
+  }
+  if (keyStatusesChange) {
+    DispatchToMainThread("ChromiumCDMProxy::OnKeyStatusesChange",
+                         &ChromiumCDMProxy::OnKeyStatusesChange,
+                         NS_ConvertUTF8toUTF16(aSessionId));
+  }
+}
+
+void ChromiumCDMCallbackProxy::ExpirationChange(const nsCString& aSessionId,
+                                                double aSecondsSinceEpoch) {
+  DispatchToMainThread("ChromiumCDMProxy::OnExpirationChange",
+                       &ChromiumCDMProxy::OnExpirationChange,
+                       NS_ConvertUTF8toUTF16(aSessionId),
+                       UnixTime(aSecondsSinceEpoch * 1000));
+}
+
+void ChromiumCDMCallbackProxy::SessionClosed(const nsCString& aSessionId) {
+  DispatchToMainThread("ChromiumCDMProxy::OnSessionClosed",
+                       &ChromiumCDMProxy::OnSessionClosed,
+                       NS_ConvertUTF8toUTF16(aSessionId));
+}
+
+void ChromiumCDMCallbackProxy::QueryOutputProtectionStatus() {
+  DispatchToMainThread("ChromiumCDMProxy::QueryOutputProtectionStatus",
+                       &ChromiumCDMProxy::QueryOutputProtectionStatus);
+}
+
+void ChromiumCDMCallbackProxy::Terminated() {
+  DispatchToMainThread("ChromiumCDMProxy::Terminated",
+                       &ChromiumCDMProxy::Terminated);
+}
+
+void ChromiumCDMCallbackProxy::Shutdown() {
+  DispatchToMainThread("ChromiumCDMProxy::Shutdown",
+                       &ChromiumCDMProxy::Shutdown);
+}
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/ChromiumCDMCallbackProxy.h b/dom/media/gmp/ChromiumCDMCallbackProxy.h
new file mode 100644
index 0000000000..5b240f9102
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMCallbackProxy.h
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ChromiumCDMCallbackProxy_h_
+#define ChromiumCDMCallbackProxy_h_
+
+#include "ChromiumCDMCallback.h"
+#include "ChromiumCDMProxy.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+
+class ChromiumCDMCallbackProxy : public ChromiumCDMCallback {
+ public:
+  ChromiumCDMCallbackProxy(ChromiumCDMProxy* aProxy,
+                           nsIEventTarget* aMainThread)
+      : mProxy(aProxy), mMainThread(aMainThread) {}
+
+  void SetSessionId(uint32_t aPromiseId, const nsCString& aSessionId) override;
+
+  void ResolveLoadSessionPromise(uint32_t aPromiseId,
+                                 bool aSuccessful) override;
+
+  void ResolvePromiseWithKeyStatus(uint32_t aPromiseId,
+                                   uint32_t aKeyStatus) override;
+
+  void ResolvePromise(uint32_t aPromiseId) override;
+
+  void RejectPromise(uint32_t aPromiseId, ErrorResult&& aException,
+                     const nsCString& aErrorMessage) override;
+
+  void SessionMessage(const nsACString& aSessionId, uint32_t aMessageType,
+                      nsTArray<uint8_t>&& aMessage) override;
+
+  void SessionKeysChange(
+      const nsCString& aSessionId,
+      nsTArray<mozilla::gmp::CDMKeyInformation>&& aKeysInfo) override;
+
+  void ExpirationChange(const nsCString& aSessionId,
+                        double aSecondsSinceEpoch) override;
+
+  void SessionClosed(const nsCString& aSessionId) override;
+
+  void QueryOutputProtectionStatus() override;
+
+  void Terminated() override;
+
+  void Shutdown() override;
+
+ private:
+  template <class Func, class... Args>
+  void DispatchToMainThread(const char* const aLabel, Func aFunc,
+                            Args&&... aArgs);
+  // Warning: Weak ref.
+  ChromiumCDMProxy* mProxy;
+  const nsCOMPtr<nsIEventTarget> mMainThread;
+};
+
+}  // namespace mozilla
+#endif
diff --git a/dom/media/gmp/ChromiumCDMChild.cpp b/dom/media/gmp/ChromiumCDMChild.cpp
new file mode 100644
index 0000000000..dc3dff1ab0
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMChild.cpp
@@ -0,0 +1,858 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ChromiumCDMChild.h"
+#include "GMPContentChild.h"
+#include "WidevineUtils.h"
+#include "WidevineFileIO.h"
+#include "WidevineVideoFrame.h"
+#include "GMPLog.h"
+#include "GMPPlatform.h"
+#include "mozilla/Unused.h"
+#include "nsPrintfCString.h"
+#include "base/time.h"
+#include "GMPUtils.h"
+#include "mozilla/ScopeExit.h"
+#include "CDMStorageIdProvider.h"
+#include "nsReadableUtils.h"
+
+#include <type_traits>
+
+namespace mozilla::gmp {
+
+ChromiumCDMChild::ChromiumCDMChild(GMPContentChild* aPlugin)
+    : mPlugin(aPlugin) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild:: ctor this=%p", this);
+}
+
+void ChromiumCDMChild::Init(cdm::ContentDecryptionModule_10* aCDM,
+                            const nsACString& aStorageId) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  mCDM = aCDM;
+  MOZ_ASSERT(mCDM);
+  mStorageId = aStorageId;
+}
+
+void ChromiumCDMChild::TimerExpired(void* aContext) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::TimerExpired(context=0x%p)", aContext);
+  if (mCDM) {
+    mCDM->TimerExpired(aContext);
+  }
+}
+
+class CDMShmemBuffer : public CDMBuffer {
+ public:
+  CDMShmemBuffer(ChromiumCDMChild* aProtocol, ipc::Shmem aShmem)
+      : mProtocol(aProtocol), mSize(aShmem.Size<uint8_t>()), mShmem(aShmem) {
+    GMP_LOG_DEBUG("CDMShmemBuffer(size=%" PRIu32 ") created", Size());
+    // Note: Chrome initializes the size of a buffer to it capacity. We do the
+    // same.
+  }
+
+  CDMShmemBuffer(ChromiumCDMChild* aProtocol, ipc::Shmem aShmem,
+                 WidevineBuffer* aLocalBuffer)
+      : CDMShmemBuffer(aProtocol, aShmem) {
+    MOZ_ASSERT(aLocalBuffer->Size() == Size());
+    memcpy(Data(), aLocalBuffer->Data(),
+           std::min<uint32_t>(aLocalBuffer->Size(), Size()));
+  }
+
+  ~CDMShmemBuffer() override {
+    GMP_LOG_DEBUG("CDMShmemBuffer(size=%" PRIu32 ") destructed writable=%d",
+                  Size(), mShmem.IsWritable());
+    if (mShmem.IsWritable()) {
+      // The shmem wasn't extracted to send its data back up to the parent
+      // process, so we can reuse the shmem.
+      mProtocol->GiveBuffer(std::move(mShmem));
+    }
+  }
+
+  void Destroy() override {
+    GMP_LOG_DEBUG("CDMShmemBuffer::Destroy(size=%" PRIu32 ")", Size());
+    delete this;
+  }
+  uint32_t Capacity() const override { return mShmem.Size<uint8_t>(); }
+
+  uint8_t* Data() override { return mShmem.get<uint8_t>(); }
+
+  void SetSize(uint32_t aSize) override {
+    MOZ_ASSERT(aSize <= Capacity());
+    // Note: We can't use the shmem's size member after ExtractShmem(),
+    // has been called, so we track the size exlicitly so that we can use
+    // Size() in logging after we've called ExtractShmem().
+    GMP_LOG_DEBUG("CDMShmemBuffer::SetSize(size=%" PRIu32 ")", Size());
+    mSize = aSize;
+  }
+
+  uint32_t Size() const override { return mSize; }
+
+  ipc::Shmem ExtractShmem() {
+    ipc::Shmem shmem = mShmem;
+    mShmem = ipc::Shmem();
+    return shmem;
+  }
+
+  CDMShmemBuffer* AsShmemBuffer() override { return this; }
+
+ private:
+  RefPtr<ChromiumCDMChild> mProtocol;
+  uint32_t mSize;
+  mozilla::ipc::Shmem mShmem;
+  CDMShmemBuffer(const CDMShmemBuffer&);
+  void operator=(const CDMShmemBuffer&);
+};
+
+static auto ToString(const nsTArray<ipc::Shmem>& aBuffers) {
+  return StringJoin(","_ns, aBuffers, [](auto& s, const ipc::Shmem& shmem) {
+    s.AppendInt(static_cast<uint32_t>(shmem.Size<uint8_t>()));
+  });
+}
+
+cdm::Buffer* ChromiumCDMChild::Allocate(uint32_t aCapacity) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::Allocate(capacity=%" PRIu32
+                ") bufferSizes={%s}",
+                aCapacity, ToString(mBuffers).get());
+  MOZ_ASSERT(IsOnMessageLoopThread());
+
+  if (mBuffers.IsEmpty()) {
+    Unused << SendIncreaseShmemPoolSize();
+  }
+
+  // Find the shmem with the least amount of wasted space if we were to
+  // select it for this sized allocation. We need to do this because shmems
+  // for decrypted audio as well as video frames are both stored in this
+  // list, and we don't want to use the video frame shmems for audio samples.
+  const size_t invalid = std::numeric_limits<size_t>::max();
+  size_t best = invalid;
+  auto wastedSpace = [this, aCapacity](size_t index) {
+    return mBuffers[index].Size<uint8_t>() - aCapacity;
+  };
+  for (size_t i = 0; i < mBuffers.Length(); i++) {
+    if (mBuffers[i].Size<uint8_t>() >= aCapacity &&
+        (best == invalid || wastedSpace(i) < wastedSpace(best))) {
+      best = i;
+    }
+  }
+  if (best == invalid) {
+    // The parent process should have bestowed upon us a shmem of appropriate
+    // size, but did not! Do a "dive and catch", and create an non-shared
+    // memory buffer. The parent will detect this and send us an extra shmem
+    // so future frames can be in shmems, i.e. returned on the fast path.
+    return new WidevineBuffer(aCapacity);
+  }
+  ipc::Shmem shmem = mBuffers[best];
+  mBuffers.RemoveElementAt(best);
+  return new CDMShmemBuffer(this, shmem);
+}
+
+void ChromiumCDMChild::SetTimer(int64_t aDelayMs, void* aContext) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::SetTimer(delay=%" PRId64 ", context=0x%p)",
+                aDelayMs, aContext);
+  RefPtr<ChromiumCDMChild> self(this);
+  SetTimerOnMainThread(
+      NewGMPTask([self, aContext]() { self->TimerExpired(aContext); }),
+      aDelayMs);
+}
+
+cdm::Time ChromiumCDMChild::GetCurrentWallTime() {
+  return base::Time::Now().ToDoubleT();
+}
+
+template <typename MethodType, typename... ParamType>
+void ChromiumCDMChild::CallMethod(MethodType aMethod, ParamType&&... aParams) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  // Avoid calling member function after destroy.
+  if (!mDestroyed) {
+    Unused << (this->*aMethod)(std::forward<ParamType>(aParams)...);
+  }
+}
+
+template <typename MethodType, typename... ParamType>
+void ChromiumCDMChild::CallOnMessageLoopThread(const char* const aName,
+                                               MethodType aMethod,
+                                               ParamType&&... aParams) {
+  if (IsOnMessageLoopThread()) {
+    CallMethod(aMethod, std::forward<ParamType>(aParams)...);
+  } else {
+    auto m = &ChromiumCDMChild::CallMethod<
+        decltype(aMethod), const std::remove_reference_t<ParamType>&...>;
+    RefPtr<mozilla::Runnable> t =
+        NewRunnableMethod<decltype(aMethod),
+                          const std::remove_reference_t<ParamType>...>(
+            aName, this, m, aMethod, std::forward<ParamType>(aParams)...);
+    mPlugin->GMPMessageLoop()->PostTask(t.forget());
+  }
+}
+
+void ChromiumCDMChild::OnResolveKeyStatusPromise(uint32_t aPromiseId,
+                                                 cdm::KeyStatus aKeyStatus) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::OnResolveKeyStatusPromise(pid=%" PRIu32
+                "keystatus=%d)",
+                aPromiseId, aKeyStatus);
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::OnResolveKeyStatusPromise",
+                          &ChromiumCDMChild::SendOnResolvePromiseWithKeyStatus,
+                          aPromiseId, static_cast<uint32_t>(aKeyStatus));
+}
+
+bool ChromiumCDMChild::OnResolveNewSessionPromiseInternal(
+    uint32_t aPromiseId, const nsACString& aSessionId) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  if (mLoadSessionPromiseIds.Contains(aPromiseId)) {
+    // As laid out in the Chromium CDM API, if the CDM fails to load
+    // a session it calls OnResolveNewSessionPromise with nullptr as the
+    // sessionId. We can safely assume this means that we have failed to load a
+    // session as the other methods specify calling 'OnRejectPromise' when they
+    // fail.
+    bool loadSuccessful = !aSessionId.IsEmpty();
+    GMP_LOG_DEBUG(
+        "ChromiumCDMChild::OnResolveNewSessionPromise(pid=%u, sid=%s) "
+        "resolving %s load session ",
+        aPromiseId, PromiseFlatCString(aSessionId).get(),
+        (loadSuccessful ? "successful" : "failed"));
+    mLoadSessionPromiseIds.RemoveElement(aPromiseId);
+    return SendResolveLoadSessionPromise(aPromiseId, loadSuccessful);
+  }
+
+  return SendOnResolveNewSessionPromise(aPromiseId, aSessionId);
+}
+void ChromiumCDMChild::OnResolveNewSessionPromise(uint32_t aPromiseId,
+                                                  const char* aSessionId,
+                                                  uint32_t aSessionIdSize) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::OnResolveNewSessionPromise(pid=%" PRIu32
+                ", sid=%s)",
+                aPromiseId, aSessionId);
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::OnResolveNewSessionPromise",
+                          &ChromiumCDMChild::OnResolveNewSessionPromiseInternal,
+                          aPromiseId, nsCString(aSessionId, aSessionIdSize));
+}
+
+void ChromiumCDMChild::OnResolvePromise(uint32_t aPromiseId) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::OnResolvePromise(pid=%" PRIu32 ")",
+                aPromiseId);
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::OnResolvePromise",
+                          &ChromiumCDMChild::SendOnResolvePromise, aPromiseId);
+}
+
+void ChromiumCDMChild::OnRejectPromise(uint32_t aPromiseId,
+                                       cdm::Exception aException,
+                                       uint32_t aSystemCode,
+                                       const char* aErrorMessage,
+                                       uint32_t aErrorMessageSize) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::OnRejectPromise(pid=%" PRIu32
+                ", err=%" PRIu32 " code=%" PRIu32 ", msg='%s')",
+                aPromiseId, aException, aSystemCode, aErrorMessage);
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::OnRejectPromise",
+                          &ChromiumCDMChild::SendOnRejectPromise, aPromiseId,
+                          static_cast<uint32_t>(aException), aSystemCode,
+                          nsCString(aErrorMessage, aErrorMessageSize));
+}
+
+void ChromiumCDMChild::OnSessionMessage(const char* aSessionId,
+                                        uint32_t aSessionIdSize,
+                                        cdm::MessageType aMessageType,
+                                        const char* aMessage,
+                                        uint32_t aMessageSize) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::OnSessionMessage(sid=%s, type=%" PRIu32
+                " size=%" PRIu32 ")",
+                aSessionId, aMessageType, aMessageSize);
+  CopyableTArray<uint8_t> message;
+  message.AppendElements(aMessage, aMessageSize);
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::OnSessionMessage",
+                          &ChromiumCDMChild::SendOnSessionMessage,
+                          nsCString(aSessionId, aSessionIdSize),
+                          static_cast<uint32_t>(aMessageType), message);
+}
+
+static auto ToString(const cdm::KeyInformation* aKeysInfo,
+                     uint32_t aKeysInfoCount) {
+  return StringJoin(","_ns, Span{aKeysInfo, aKeysInfoCount},
+                    [](auto& str, const cdm::KeyInformation& key) {
+                      str.Append(ToHexString(key.key_id, key.key_id_size));
+                      str.AppendLiteral("=");
+                      str.AppendInt(key.status);
+                    });
+}
+
+void ChromiumCDMChild::OnSessionKeysChange(const char* aSessionId,
+                                           uint32_t aSessionIdSize,
+                                           bool aHasAdditionalUsableKey,
+                                           const cdm::KeyInformation* aKeysInfo,
+                                           uint32_t aKeysInfoCount) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::OnSessionKeysChange(sid=%s) keys={%s}",
+                aSessionId, ToString(aKeysInfo, aKeysInfoCount).get());
+
+  CopyableTArray<CDMKeyInformation> keys;
+  keys.SetCapacity(aKeysInfoCount);
+  for (uint32_t i = 0; i < aKeysInfoCount; i++) {
+    const cdm::KeyInformation& key = aKeysInfo[i];
+    nsTArray<uint8_t> kid;
+    kid.AppendElements(key.key_id, key.key_id_size);
+    keys.AppendElement(CDMKeyInformation(kid, key.status, key.system_code));
+  }
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::OnSessionMessage",
+                          &ChromiumCDMChild::SendOnSessionKeysChange,
+                          nsCString(aSessionId, aSessionIdSize), keys);
+}
+
+void ChromiumCDMChild::OnExpirationChange(const char* aSessionId,
+                                          uint32_t aSessionIdSize,
+                                          cdm::Time aNewExpiryTime) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::OnExpirationChange(sid=%s, time=%lf)",
+                aSessionId, aNewExpiryTime);
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::OnExpirationChange",
+                          &ChromiumCDMChild::SendOnExpirationChange,
+                          nsCString(aSessionId, aSessionIdSize),
+                          aNewExpiryTime);
+}
+
+void ChromiumCDMChild::OnSessionClosed(const char* aSessionId,
+                                       uint32_t aSessionIdSize) {
+  GMP_LOG_DEBUG("ChromiumCDMChild::OnSessionClosed(sid=%s)", aSessionId);
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::OnSessionClosed",
+                          &ChromiumCDMChild::SendOnSessionClosed,
+                          nsCString(aSessionId, aSessionIdSize));
+}
+
+void ChromiumCDMChild::QueryOutputProtectionStatus() {
+  GMP_LOG_DEBUG("ChromiumCDMChild::QueryOutputProtectionStatus()");
+  // We'll handle the response in `CompleteQueryOutputProtectionStatus`.
+  CallOnMessageLoopThread("gmp::ChromiumCDMChild::QueryOutputProtectionStatus",
+                          &ChromiumCDMChild::SendOnQueryOutputProtectionStatus);
+}
+
+void ChromiumCDMChild::OnInitialized(bool aSuccess) {
+  MOZ_ASSERT(!mInitPromise.IsEmpty(),
+             "mInitPromise should exist during init callback!");
+  if (!aSuccess) {
+    mInitPromise.RejectIfExists(NS_ERROR_FAILURE, __func__);
+  }
+  mInitPromise.ResolveIfExists(true, __func__);
+}
+
+cdm::FileIO* ChromiumCDMChild::CreateFileIO(cdm::FileIOClient* aClient) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::CreateFileIO()");
+  if (!mPersistentStateAllowed) {
+    return nullptr;
+  }
+  return new WidevineFileIO(aClient);
+}
+
+void ChromiumCDMChild::RequestStorageId(uint32_t aVersion) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RequestStorageId() aVersion = %u", aVersion);
+  // aVersion >= 0x80000000 are reserved.
+  if (aVersion >= 0x80000000) {
+    mCDM->OnStorageId(aVersion, nullptr, 0);
+    return;
+  }
+  if (aVersion > CDMStorageIdProvider::kCurrentVersion) {
+    mCDM->OnStorageId(aVersion, nullptr, 0);
+    return;
+  }
+
+  mCDM->OnStorageId(CDMStorageIdProvider::kCurrentVersion,
+                    !mStorageId.IsEmpty()
+                        ? reinterpret_cast<const uint8_t*>(mStorageId.get())
+                        : nullptr,
+                    mStorageId.Length());
+}
+
+ChromiumCDMChild::~ChromiumCDMChild() {
+  GMP_LOG_DEBUG("ChromiumCDMChild:: dtor this=%p", this);
+}
+
+bool ChromiumCDMChild::IsOnMessageLoopThread() {
+  return mPlugin && mPlugin->GMPMessageLoop() == MessageLoop::current();
+}
+
+void ChromiumCDMChild::PurgeShmems() {
+  for (ipc::Shmem& shmem : mBuffers) {
+    DeallocShmem(shmem);
+  }
+  mBuffers.Clear();
+}
+
+ipc::IPCResult ChromiumCDMChild::RecvPurgeShmems() {
+  PurgeShmems();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvInit(
+    const bool& aAllowDistinctiveIdentifier, const bool& aAllowPersistentState,
+    InitResolver&& aResolver) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMChild::RecvInit(distinctiveId=%s, persistentState=%s)",
+      aAllowDistinctiveIdentifier ? "true" : "false",
+      aAllowPersistentState ? "true" : "false");
+  mPersistentStateAllowed = aAllowPersistentState;
+
+  RefPtr<ChromiumCDMChild::InitPromise> promise = mInitPromise.Ensure(__func__);
+  promise->Then(
+      mPlugin->GMPMessageLoop()->SerialEventTarget(), __func__,
+      [aResolver](bool /* unused */) { aResolver(true); },
+      [aResolver](nsresult rv) {
+        GMP_LOG_DEBUG(
+            "ChromiumCDMChild::RecvInit() init promise rejected with "
+            "rv=%" PRIu32,
+            static_cast<uint32_t>(rv));
+        aResolver(false);
+      });
+
+  if (mCDM) {
+    // Once the CDM is initialized we expect it to resolve mInitPromise via
+    // ChromiumCDMChild::OnInitialized
+    mCDM->Initialize(aAllowDistinctiveIdentifier, aAllowPersistentState,
+                     // We do not yet support hardware secure codecs
+                     false);
+  } else {
+    GMP_LOG_DEBUG(
+        "ChromiumCDMChild::RecvInit() mCDM not set! Is GMP shutting down?");
+    mInitPromise.RejectIfExists(NS_ERROR_FAILURE, __func__);
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvSetServerCertificate(
+    const uint32_t& aPromiseId, nsTArray<uint8_t>&& aServerCert)
+
+{
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvSetServerCertificate() certlen=%zu",
+                aServerCert.Length());
+  if (mCDM) {
+    mCDM->SetServerCertificate(aPromiseId, aServerCert.Elements(),
+                               aServerCert.Length());
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvCreateSessionAndGenerateRequest(
+    const uint32_t& aPromiseId, const uint32_t& aSessionType,
+    const uint32_t& aInitDataType, nsTArray<uint8_t>&& aInitData) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMChild::RecvCreateSessionAndGenerateRequest("
+      "pid=%" PRIu32 ", sessionType=%" PRIu32 ", initDataType=%" PRIu32
+      ") initDataLen=%zu",
+      aPromiseId, aSessionType, aInitDataType, aInitData.Length());
+  MOZ_ASSERT(aSessionType <= cdm::SessionType::kPersistentUsageRecord);
+  MOZ_ASSERT(aInitDataType <= cdm::InitDataType::kWebM);
+  if (mCDM) {
+    mCDM->CreateSessionAndGenerateRequest(
+        aPromiseId, static_cast<cdm::SessionType>(aSessionType),
+        static_cast<cdm::InitDataType>(aInitDataType), aInitData.Elements(),
+        aInitData.Length());
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvLoadSession(
+    const uint32_t& aPromiseId, const uint32_t& aSessionType,
+    const nsACString& aSessionId) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMChild::RecvLoadSession(pid=%u, type=%u, sessionId=%s)",
+      aPromiseId, aSessionType, PromiseFlatCString(aSessionId).get());
+  if (mCDM) {
+    mLoadSessionPromiseIds.AppendElement(aPromiseId);
+    mCDM->LoadSession(aPromiseId, static_cast<cdm::SessionType>(aSessionType),
+                      aSessionId.BeginReading(), aSessionId.Length());
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvUpdateSession(
+    const uint32_t& aPromiseId, const nsACString& aSessionId,
+    nsTArray<uint8_t>&& aResponse) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvUpdateSession(pid=%" PRIu32
+                ", sid=%s) responseLen=%zu",
+                aPromiseId, PromiseFlatCString(aSessionId).get(),
+                aResponse.Length());
+  if (mCDM) {
+    mCDM->UpdateSession(aPromiseId, aSessionId.BeginReading(),
+                        aSessionId.Length(), aResponse.Elements(),
+                        aResponse.Length());
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvCloseSession(
+    const uint32_t& aPromiseId, const nsACString& aSessionId) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvCloseSession(pid=%" PRIu32 ", sid=%s)",
+                aPromiseId, PromiseFlatCString(aSessionId).get());
+  if (mCDM) {
+    mCDM->CloseSession(aPromiseId, aSessionId.BeginReading(),
+                       aSessionId.Length());
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvRemoveSession(
+    const uint32_t& aPromiseId, const nsACString& aSessionId) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvRemoveSession(pid=%" PRIu32 ", sid=%s)",
+                aPromiseId, PromiseFlatCString(aSessionId).get());
+  if (mCDM) {
+    mCDM->RemoveSession(aPromiseId, aSessionId.BeginReading(),
+                        aSessionId.Length());
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult
+ChromiumCDMChild::RecvCompleteQueryOutputProtectionStatus(
+    const bool& aSuccess, const uint32_t& aLinkMask,
+    const uint32_t& aProtectionMask) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMChild::RecvCompleteQueryOutputProtectionStatus(aSuccess=%s, "
+      "aLinkMask=%" PRIu32 ", aProtectionMask=%" PRIu32 ")",
+      aSuccess ? "true" : "false", aLinkMask, aProtectionMask);
+
+  if (mCDM) {
+    cdm::QueryResult queryResult = aSuccess ? cdm::QueryResult::kQuerySucceeded
+                                            : cdm::QueryResult::kQueryFailed;
+    mCDM->OnQueryOutputProtectionStatus(queryResult, aLinkMask,
+                                        aProtectionMask);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvGetStatusForPolicy(
+    const uint32_t& aPromiseId, const cdm::HdcpVersion& aMinHdcpVersion) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvGetStatusForPolicy(pid=%" PRIu32
+                ", MinHdcpVersion=%" PRIu32 ")",
+                aPromiseId, static_cast<uint32_t>(aMinHdcpVersion));
+  if (mCDM) {
+    cdm::Policy policy;
+    policy.min_hdcp_version = aMinHdcpVersion;
+    mCDM->GetStatusForPolicy(aPromiseId, policy);
+  }
+  return IPC_OK();
+}
+
+static void InitInputBuffer(const CDMInputBuffer& aBuffer,
+                            nsTArray<cdm::SubsampleEntry>& aSubSamples,
+                            cdm::InputBuffer_2& aInputBuffer) {
+  aInputBuffer.data = aBuffer.mData().get<uint8_t>();
+  aInputBuffer.data_size = aBuffer.mData().Size<uint8_t>();
+
+  if (aBuffer.mEncryptionScheme() != cdm::EncryptionScheme::kUnencrypted) {
+    MOZ_ASSERT(aBuffer.mEncryptionScheme() == cdm::EncryptionScheme::kCenc ||
+               aBuffer.mEncryptionScheme() == cdm::EncryptionScheme::kCbcs);
+    aInputBuffer.key_id = aBuffer.mKeyId().Elements();
+    aInputBuffer.key_id_size = aBuffer.mKeyId().Length();
+
+    aInputBuffer.iv = aBuffer.mIV().Elements();
+    aInputBuffer.iv_size = aBuffer.mIV().Length();
+
+    aSubSamples.SetCapacity(aBuffer.mClearBytes().Length());
+    for (size_t i = 0; i < aBuffer.mCipherBytes().Length(); i++) {
+      aSubSamples.AppendElement(cdm::SubsampleEntry{aBuffer.mClearBytes()[i],
+                                                    aBuffer.mCipherBytes()[i]});
+    }
+    aInputBuffer.subsamples = aSubSamples.Elements();
+    aInputBuffer.num_subsamples = aSubSamples.Length();
+    aInputBuffer.encryption_scheme = aBuffer.mEncryptionScheme();
+  }
+  aInputBuffer.pattern.crypt_byte_block = aBuffer.mCryptByteBlock();
+  aInputBuffer.pattern.skip_byte_block = aBuffer.mSkipByteBlock();
+  aInputBuffer.timestamp = aBuffer.mTimestamp();
+}
+
+bool ChromiumCDMChild::HasShmemOfSize(size_t aSize) const {
+  for (const ipc::Shmem& shmem : mBuffers) {
+    if (shmem.Size<uint8_t>() == aSize) {
+      return true;
+    }
+  }
+  return false;
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvDecrypt(
+    const uint32_t& aId, const CDMInputBuffer& aBuffer) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvDecrypt()");
+
+  // Parent should have already gifted us a shmem to use as output.
+  size_t outputShmemSize = aBuffer.mData().Size<uint8_t>();
+  MOZ_ASSERT(HasShmemOfSize(outputShmemSize));
+
+  // Ensure we deallocate the shmem used to send input.
+  RefPtr<ChromiumCDMChild> self = this;
+  auto autoDeallocateInputShmem =
+      MakeScopeExit([&, self] { self->DeallocShmem(aBuffer.mData()); });
+
+  // On failure, we need to ensure that the shmem that the parent sent
+  // for the CDM to use to return output back to the parent is deallocated.
+  // Otherwise, it will leak.
+  auto autoDeallocateOutputShmem = MakeScopeExit([self, outputShmemSize] {
+    self->mBuffers.RemoveElementsBy(
+        [outputShmemSize, self](ipc::Shmem& aShmem) {
+          if (aShmem.Size<uint8_t>() != outputShmemSize) {
+            return false;
+          }
+          self->DeallocShmem(aShmem);
+          return true;
+        });
+  });
+
+  if (!mCDM) {
+    GMP_LOG_DEBUG("ChromiumCDMChild::RecvDecrypt() no CDM");
+    Unused << SendDecryptFailed(aId, cdm::kDecryptError);
+    return IPC_OK();
+  }
+  if (aBuffer.mClearBytes().Length() != aBuffer.mCipherBytes().Length()) {
+    GMP_LOG_DEBUG(
+        "ChromiumCDMChild::RecvDecrypt() clear/cipher bytes length doesn't "
+        "match");
+    Unused << SendDecryptFailed(aId, cdm::kDecryptError);
+    return IPC_OK();
+  }
+
+  cdm::InputBuffer_2 input = {};
+  nsTArray<cdm::SubsampleEntry> subsamples;
+  InitInputBuffer(aBuffer, subsamples, input);
+
+  WidevineDecryptedBlock output;
+  cdm::Status status = mCDM->Decrypt(input, &output);
+
+  // CDM should have allocated a cdm::Buffer for output.
+  CDMShmemBuffer* buffer =
+      output.DecryptedBuffer()
+          ? static_cast<CDMShmemBuffer*>(output.DecryptedBuffer())
+          : nullptr;
+  MOZ_ASSERT_IF(buffer, buffer->AsShmemBuffer());
+  if (status != cdm::kSuccess || !buffer) {
+    Unused << SendDecryptFailed(aId, status);
+    return IPC_OK();
+  }
+
+  // Success! Return the decrypted sample to parent.
+  MOZ_ASSERT(!HasShmemOfSize(outputShmemSize));
+  ipc::Shmem shmem = buffer->ExtractShmem();
+  if (SendDecrypted(aId, cdm::kSuccess, std::move(shmem))) {
+    // No need to deallocate the output shmem; it should have been returned
+    // to the content process.
+    autoDeallocateOutputShmem.release();
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvInitializeVideoDecoder(
+    const CDMVideoDecoderConfig& aConfig) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  MOZ_ASSERT(!mDecoderInitialized);
+  if (!mCDM) {
+    GMP_LOG_DEBUG("ChromiumCDMChild::RecvInitializeVideoDecoder() no CDM");
+    Unused << SendOnDecoderInitDone(cdm::kInitializationError);
+    return IPC_OK();
+  }
+  cdm::VideoDecoderConfig_2 config = {};
+  config.codec = static_cast<cdm::VideoCodec>(aConfig.mCodec());
+  config.profile = static_cast<cdm::VideoCodecProfile>(aConfig.mProfile());
+  config.format = static_cast<cdm::VideoFormat>(aConfig.mFormat());
+  config.coded_size =
+      mCodedSize = {aConfig.mImageWidth(), aConfig.mImageHeight()};
+  nsTArray<uint8_t> extraData(aConfig.mExtraData().Clone());
+  config.extra_data = extraData.Elements();
+  config.extra_data_size = extraData.Length();
+  config.encryption_scheme = aConfig.mEncryptionScheme();
+  cdm::Status status = mCDM->InitializeVideoDecoder(config);
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvInitializeVideoDecoder() status=%u",
+                status);
+  Unused << SendOnDecoderInitDone(status);
+  mDecoderInitialized = status == cdm::kSuccess;
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvDeinitializeVideoDecoder() {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvDeinitializeVideoDecoder()");
+  MOZ_ASSERT(mDecoderInitialized);
+  if (mDecoderInitialized && mCDM) {
+    mCDM->DeinitializeDecoder(cdm::kStreamTypeVideo);
+  }
+  mDecoderInitialized = false;
+  PurgeShmems();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvResetVideoDecoder() {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvResetVideoDecoder()");
+  if (mDecoderInitialized && mCDM) {
+    mCDM->ResetDecoder(cdm::kStreamTypeVideo);
+  }
+  Unused << SendResetVideoDecoderComplete();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvDecryptAndDecodeFrame(
+    const CDMInputBuffer& aBuffer) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvDecryptAndDecodeFrame() t=%" PRId64 ")",
+                aBuffer.mTimestamp());
+  MOZ_ASSERT(mDecoderInitialized);
+
+  if (!mCDM) {
+    GMP_LOG_DEBUG("ChromiumCDMChild::RecvDecryptAndDecodeFrame() no CDM");
+    Unused << SendDecodeFailed(cdm::kDecodeError);
+    return IPC_OK();
+  }
+
+  RefPtr<ChromiumCDMChild> self = this;
+  auto autoDeallocateShmem =
+      MakeScopeExit([&, self] { self->DeallocShmem(aBuffer.mData()); });
+
+  // The output frame may not have the same timestamp as the frame we put in.
+  // We may need to input a number of frames before we receive output. The
+  // CDM's decoder reorders to ensure frames output are in presentation order.
+  // So we need to store the durations of the frames input, and retrieve them
+  // on output.
+  mFrameDurations.Insert(aBuffer.mTimestamp(), aBuffer.mDuration());
+
+  cdm::InputBuffer_2 input = {};
+  nsTArray<cdm::SubsampleEntry> subsamples;
+  InitInputBuffer(aBuffer, subsamples, input);
+
+  WidevineVideoFrame frame;
+  cdm::Status rv = mCDM->DecryptAndDecodeFrame(input, &frame);
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvDecryptAndDecodeFrame() t=%" PRId64
+                " CDM decoder rv=%d",
+                aBuffer.mTimestamp(), rv);
+
+  switch (rv) {
+    case cdm::kNeedMoreData:
+      Unused << SendDecodeFailed(rv);
+      break;
+    case cdm::kNoKey:
+      GMP_LOG_DEBUG("NoKey for sample at time=%" PRId64 "!", input.timestamp);
+      // Somehow our key became unusable. Typically this would happen when
+      // a stream requires output protection, and the configuration changed
+      // such that output protection is no longer available. For example, a
+      // non-compliant monitor was attached. The JS player should notice the
+      // key status changing to "output-restricted", and is supposed to switch
+      // to a stream that doesn't require OP. In order to keep the playback
+      // pipeline rolling, just output a black frame. See bug 1343140.
+      if (!frame.InitToBlack(mCodedSize.width, mCodedSize.height,
+                             input.timestamp)) {
+        Unused << SendDecodeFailed(cdm::kDecodeError);
+        break;
+      }
+      [[fallthrough]];
+    case cdm::kSuccess:
+      if (frame.FrameBuffer()) {
+        ReturnOutput(frame);
+        break;
+      }
+      // CDM didn't set a frame buffer on the sample, report it as an error.
+      [[fallthrough]];
+    default:
+      Unused << SendDecodeFailed(rv);
+      break;
+  }
+
+  return IPC_OK();
+}
+
+void ChromiumCDMChild::ReturnOutput(WidevineVideoFrame& aFrame) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  MOZ_ASSERT(aFrame.FrameBuffer());
+  gmp::CDMVideoFrame output;
+  output.mFormat() = static_cast<cdm::VideoFormat>(aFrame.Format());
+  output.mImageWidth() = aFrame.Size().width;
+  output.mImageHeight() = aFrame.Size().height;
+  output.mYPlane() = {aFrame.PlaneOffset(cdm::VideoPlane::kYPlane),
+                      aFrame.Stride(cdm::VideoPlane::kYPlane)};
+  output.mUPlane() = {aFrame.PlaneOffset(cdm::VideoPlane::kUPlane),
+                      aFrame.Stride(cdm::VideoPlane::kUPlane)};
+  output.mVPlane() = {aFrame.PlaneOffset(cdm::VideoPlane::kVPlane),
+                      aFrame.Stride(cdm::VideoPlane::kVPlane)};
+  output.mTimestamp() = aFrame.Timestamp();
+
+  uint64_t duration = 0;
+  if (mFrameDurations.Find(aFrame.Timestamp(), duration)) {
+    output.mDuration() = duration;
+  }
+
+  CDMBuffer* base = reinterpret_cast<CDMBuffer*>(aFrame.FrameBuffer());
+  if (base->AsShmemBuffer()) {
+    ipc::Shmem shmem = base->AsShmemBuffer()->ExtractShmem();
+    Unused << SendDecodedShmem(output, std::move(shmem));
+  } else {
+    MOZ_ASSERT(base->AsArrayBuffer());
+    Unused << SendDecodedData(output, base->AsArrayBuffer()->ExtractBuffer());
+  }
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvDrain() {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  if (!mCDM) {
+    GMP_LOG_DEBUG("ChromiumCDMChild::RecvDrain() no CDM");
+    Unused << SendDrainComplete();
+    return IPC_OK();
+  }
+  WidevineVideoFrame frame;
+  cdm::InputBuffer_2 sample = {};
+  cdm::Status rv = mCDM->DecryptAndDecodeFrame(sample, &frame);
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvDrain();  DecryptAndDecodeFrame() rv=%d",
+                rv);
+  if (rv == cdm::kSuccess) {
+    MOZ_ASSERT(frame.Format() != cdm::kUnknownVideoFormat);
+    ReturnOutput(frame);
+  } else {
+    Unused << SendDrainComplete();
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvDestroy() {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  GMP_LOG_DEBUG("ChromiumCDMChild::RecvDestroy()");
+
+  MOZ_ASSERT(!mDecoderInitialized);
+
+  mInitPromise.RejectIfExists(NS_ERROR_ABORT, __func__);
+
+  if (mCDM) {
+    mCDM->Destroy();
+    mCDM = nullptr;
+  }
+  mDestroyed = true;
+
+  Unused << Send__delete__(this);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult ChromiumCDMChild::RecvGiveBuffer(ipc::Shmem&& aBuffer) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+
+  GiveBuffer(std::move(aBuffer));
+  return IPC_OK();
+}
+
+void ChromiumCDMChild::GiveBuffer(ipc::Shmem&& aBuffer) {
+  MOZ_ASSERT(IsOnMessageLoopThread());
+  size_t sz = aBuffer.Size<uint8_t>();
+  mBuffers.AppendElement(std::move(aBuffer));
+  GMP_LOG_DEBUG(
+      "ChromiumCDMChild::RecvGiveBuffer(capacity=%zu"
+      ") bufferSizes={%s} mDecoderInitialized=%d",
+      sz, ToString(mBuffers).get(), mDecoderInitialized);
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/ChromiumCDMChild.h b/dom/media/gmp/ChromiumCDMChild.h
new file mode 100644
index 0000000000..a0c929a4e6
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMChild.h
@@ -0,0 +1,146 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ChromiumCDMChild_h_
+#define ChromiumCDMChild_h_
+
+#include "content_decryption_module.h"
+#include "mozilla/gmp/PChromiumCDMChild.h"
+#include "SimpleMap.h"
+#include "WidevineVideoFrame.h"
+
+namespace mozilla::gmp {
+
+class GMPContentChild;
+
+class ChromiumCDMChild : public PChromiumCDMChild, public cdm::Host_10 {
+ public:
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PChromiumCDMChild.
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ChromiumCDMChild, final);
+
+  explicit ChromiumCDMChild(GMPContentChild* aPlugin);
+
+  void Init(cdm::ContentDecryptionModule_10* aCDM,
+            const nsACString& aStorageId);
+
+  void TimerExpired(void* aContext);
+
+  // cdm::Host_10 implementation
+  cdm::Buffer* Allocate(uint32_t aCapacity) override;
+  void SetTimer(int64_t aDelayMs, void* aContext) override;
+  cdm::Time GetCurrentWallTime() override;
+  void OnResolveKeyStatusPromise(uint32_t aPromiseId,
+                                 cdm::KeyStatus aKeyStatus) override;
+  void OnResolveNewSessionPromise(uint32_t aPromiseId, const char* aSessionId,
+                                  uint32_t aSessionIdSize) override;
+  void OnResolvePromise(uint32_t aPromiseId) override;
+  void OnRejectPromise(uint32_t aPromiseId, cdm::Exception aException,
+                       uint32_t aSystemCode, const char* aErrorMessage,
+                       uint32_t aErrorMessageSize) override;
+  void OnSessionMessage(const char* aSessionId, uint32_t aSessionIdSize,
+                        cdm::MessageType aMessageType, const char* aMessage,
+                        uint32_t aMessageSize) override;
+  void OnSessionKeysChange(const char* aSessionId, uint32_t aSessionIdSize,
+                           bool aHasAdditionalUsableKey,
+                           const cdm::KeyInformation* aKeysInfo,
+                           uint32_t aKeysInfoCount) override;
+  void OnExpirationChange(const char* aSessionId, uint32_t aSessionIdSize,
+                          cdm::Time aNewExpiryTime) override;
+  void OnSessionClosed(const char* aSessionId,
+                       uint32_t aSessionIdSize) override;
+  void SendPlatformChallenge(const char* aServiceId, uint32_t aServiceIdSize,
+                             const char* aChallenge,
+                             uint32_t aChallengeSize) override {}
+  void EnableOutputProtection(uint32_t aDesiredProtectionMask) override {}
+  void QueryOutputProtectionStatus() override;
+  void OnDeferredInitializationDone(cdm::StreamType aStreamType,
+                                    cdm::Status aDecoderStatus) override {}
+  void RequestStorageId(uint32_t aVersion) override;
+  cdm::FileIO* CreateFileIO(cdm::FileIOClient* aClient) override;
+  void OnInitialized(bool aSuccess) override;
+  // end cdm::Host_10 specific methods
+
+  void GiveBuffer(ipc::Shmem&& aBuffer);
+
+ protected:
+  ~ChromiumCDMChild();
+
+  bool OnResolveNewSessionPromiseInternal(uint32_t aPromiseId,
+                                          const nsACString& aSessionId);
+
+  bool IsOnMessageLoopThread();
+
+  ipc::IPCResult RecvGiveBuffer(ipc::Shmem&& aShmem) override;
+  ipc::IPCResult RecvPurgeShmems() override;
+  void PurgeShmems();
+  ipc::IPCResult RecvInit(const bool& aAllowDistinctiveIdentifier,
+                          const bool& aAllowPersistentState,
+                          InitResolver&& aResolver) override;
+  ipc::IPCResult RecvSetServerCertificate(
+      const uint32_t& aPromiseId, nsTArray<uint8_t>&& aServerCert) override;
+  ipc::IPCResult RecvCreateSessionAndGenerateRequest(
+      const uint32_t& aPromiseId, const uint32_t& aSessionType,
+      const uint32_t& aInitDataType, nsTArray<uint8_t>&& aInitData) override;
+  ipc::IPCResult RecvLoadSession(const uint32_t& aPromiseId,
+                                 const uint32_t& aSessionType,
+                                 const nsACString& aSessionId) override;
+  ipc::IPCResult RecvUpdateSession(const uint32_t& aPromiseId,
+                                   const nsACString& aSessionId,
+                                   nsTArray<uint8_t>&& aResponse) override;
+  ipc::IPCResult RecvCloseSession(const uint32_t& aPromiseId,
+                                  const nsACString& aSessionId) override;
+  ipc::IPCResult RecvRemoveSession(const uint32_t& aPromiseId,
+                                   const nsACString& aSessionId) override;
+  ipc::IPCResult RecvCompleteQueryOutputProtectionStatus(
+      const bool& aSuccess, const uint32_t& aLinkMask,
+      const uint32_t& aProtectionMask) override;
+  ipc::IPCResult RecvGetStatusForPolicy(
+      const uint32_t& aPromiseId,
+      const cdm::HdcpVersion& aMinHdcpVersion) override;
+  ipc::IPCResult RecvDecrypt(const uint32_t& aId,
+                             const CDMInputBuffer& aBuffer) override;
+  ipc::IPCResult RecvInitializeVideoDecoder(
+      const CDMVideoDecoderConfig& aConfig) override;
+  ipc::IPCResult RecvDeinitializeVideoDecoder() override;
+  ipc::IPCResult RecvResetVideoDecoder() override;
+  ipc::IPCResult RecvDecryptAndDecodeFrame(
+      const CDMInputBuffer& aBuffer) override;
+  ipc::IPCResult RecvDrain() override;
+  ipc::IPCResult RecvDestroy() override;
+
+  void ReturnOutput(WidevineVideoFrame& aFrame);
+  bool HasShmemOfSize(size_t aSize) const;
+
+  template <typename MethodType, typename... ParamType>
+  void CallMethod(MethodType, ParamType&&...);
+
+  template <typename MethodType, typename... ParamType>
+  void CallOnMessageLoopThread(const char* const, MethodType, ParamType&&...);
+
+  GMPContentChild* mPlugin = nullptr;
+  cdm::ContentDecryptionModule_10* mCDM = nullptr;
+
+  typedef SimpleMap<uint64_t> DurationMap;
+  DurationMap mFrameDurations;
+  nsTArray<uint32_t> mLoadSessionPromiseIds;
+
+  cdm::Size mCodedSize = {0, 0};
+  nsTArray<ipc::Shmem> mBuffers;
+
+  bool mDecoderInitialized = false;
+  bool mPersistentStateAllowed = false;
+  bool mDestroyed = false;
+  nsCString mStorageId;
+
+  typedef MozPromise<bool, nsresult, /* IsExclusive = */ true> InitPromise;
+  // Created when we RecvInit, should be resolved once the CDM is initialized
+  // or rejected if init fails.
+  MozPromiseHolder<InitPromise> mInitPromise;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // ChromiumCDMChild_h_
diff --git a/dom/media/gmp/ChromiumCDMParent.cpp b/dom/media/gmp/ChromiumCDMParent.cpp
new file mode 100644
index 0000000000..ddb1e38d33
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMParent.cpp
@@ -0,0 +1,1319 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ChromiumCDMParent.h"
+
+#include "ChromiumCDMCallback.h"
+#include "ChromiumCDMCallbackProxy.h"
+#include "ChromiumCDMProxy.h"
+#include "content_decryption_module.h"
+#include "GMPContentChild.h"
+#include "GMPContentParent.h"
+#include "GMPLog.h"
+#include "GMPService.h"
+#include "GMPUtils.h"
+#include "VideoUtils.h"
+#include "mozilla/dom/MediaKeyMessageEventBinding.h"
+#include "mozilla/gmp/GMPTypes.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "mozilla/Unused.h"
+#include "AnnexB.h"
+#include "H264.h"
+
+#define NS_DispatchToMainThread(...) CompileError_UseAbstractMainThreadInstead
+
+namespace mozilla::gmp {
+
+using namespace eme;
+
+ChromiumCDMParent::ChromiumCDMParent(GMPContentParent* aContentParent,
+                                     uint32_t aPluginId)
+    : mPluginId(aPluginId),
+      mContentParent(aContentParent),
+      mVideoShmemLimit(StaticPrefs::media_eme_chromium_api_video_shmems())
+#ifdef DEBUG
+      ,
+      mGMPThread(aContentParent->GMPEventTarget())
+#endif
+{
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::ChromiumCDMParent(this=%p, contentParent=%p, "
+      "id=%" PRIu32 ")",
+      this, aContentParent, aPluginId);
+}
+
+RefPtr<ChromiumCDMParent::InitPromise> ChromiumCDMParent::Init(
+    ChromiumCDMCallback* aCDMCallback, bool aAllowDistinctiveIdentifier,
+    bool aAllowPersistentState, nsIEventTarget* aMainThread) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::Init(this=%p) shutdown=%s abormalShutdown=%s "
+      "actorDestroyed=%s",
+      this, mIsShutdown ? "true" : "false",
+      mAbnormalShutdown ? "true" : "false", mActorDestroyed ? "true" : "false");
+  if (!aCDMCallback || !aMainThread) {
+    GMP_LOG_DEBUG(
+        "ChromiumCDMParent::Init(this=%p) failed "
+        "nullCallback=%s nullMainThread=%s",
+        this, !aCDMCallback ? "true" : "false",
+        !aMainThread ? "true" : "false");
+
+    return ChromiumCDMParent::InitPromise::CreateAndReject(
+        MediaResult(NS_ERROR_FAILURE,
+                    nsPrintfCString("ChromiumCDMParent::Init() failed "
+                                    "nullCallback=%s nullMainThread=%s",
+                                    !aCDMCallback ? "true" : "false",
+                                    !aMainThread ? "true" : "false")),
+        __func__);
+  }
+
+  RefPtr<ChromiumCDMParent::InitPromise> promise =
+      mInitPromise.Ensure(__func__);
+  RefPtr<ChromiumCDMParent> self = this;
+  SendInit(aAllowDistinctiveIdentifier, aAllowPersistentState)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [self, aCDMCallback](bool aSuccess) {
+            if (!aSuccess) {
+              GMP_LOG_DEBUG(
+                  "ChromiumCDMParent::Init() failed with callback from "
+                  "child indicating CDM failed init");
+              self->mInitPromise.RejectIfExists(
+                  MediaResult(NS_ERROR_FAILURE,
+                              "ChromiumCDMParent::Init() failed with callback "
+                              "from child indicating CDM failed init"),
+                  __func__);
+              return;
+            }
+            GMP_LOG_DEBUG(
+                "ChromiumCDMParent::Init() succeeded with callback from child");
+            self->mCDMCallback = aCDMCallback;
+            self->mInitPromise.ResolveIfExists(true /* unused */, __func__);
+          },
+          [self](ResponseRejectReason&& aReason) {
+            RefPtr<gmp::GeckoMediaPluginService> service =
+                gmp::GeckoMediaPluginService::GetGeckoMediaPluginService();
+            bool xpcomWillShutdown =
+                service && service->XPCOMWillShutdownReceived();
+            GMP_LOG_DEBUG(
+                "ChromiumCDMParent::Init(this=%p) failed "
+                "shutdown=%s cdmCrash=%s actorDestroyed=%s "
+                "browserShutdown=%s promiseRejectReason=%d",
+                self.get(), self->mIsShutdown ? "true" : "false",
+                self->mAbnormalShutdown ? "true" : "false",
+                self->mActorDestroyed ? "true" : "false",
+                xpcomWillShutdown ? "true" : "false",
+                static_cast<int>(aReason));
+            self->mInitPromise.RejectIfExists(
+                MediaResult(
+                    NS_ERROR_FAILURE,
+                    nsPrintfCString("ChromiumCDMParent::Init() failed "
+                                    "shutdown=%s cdmCrash=%s actorDestroyed=%s "
+                                    "browserShutdown=%s promiseRejectReason=%d",
+                                    self->mIsShutdown ? "true" : "false",
+                                    self->mAbnormalShutdown ? "true" : "false",
+                                    self->mActorDestroyed ? "true" : "false",
+                                    xpcomWillShutdown ? "true" : "false",
+                                    static_cast<int>(aReason))),
+                __func__);
+          });
+  return promise;
+}
+
+void ChromiumCDMParent::CreateSession(uint32_t aCreateSessionToken,
+                                      uint32_t aSessionType,
+                                      uint32_t aInitDataType,
+                                      uint32_t aPromiseId,
+                                      const nsTArray<uint8_t>& aInitData) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::CreateSession(this=%p)", this);
+  if (mIsShutdown) {
+    RejectPromiseShutdown(aPromiseId);
+    return;
+  }
+  if (!SendCreateSessionAndGenerateRequest(aPromiseId, aSessionType,
+                                           aInitDataType, aInitData)) {
+    RejectPromiseWithStateError(
+        aPromiseId, "Failed to send generateRequest to CDM process."_ns);
+    return;
+  }
+  mPromiseToCreateSessionToken.InsertOrUpdate(aPromiseId, aCreateSessionToken);
+}
+
+void ChromiumCDMParent::LoadSession(uint32_t aPromiseId, uint32_t aSessionType,
+                                    nsString aSessionId) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::LoadSession(this=%p, pid=%" PRIu32
+                ", type=%" PRIu32 ", sid=%s)",
+                this, aPromiseId, aSessionType,
+                NS_ConvertUTF16toUTF8(aSessionId).get());
+  if (mIsShutdown) {
+    RejectPromiseShutdown(aPromiseId);
+    return;
+  }
+  if (!SendLoadSession(aPromiseId, aSessionType,
+                       NS_ConvertUTF16toUTF8(aSessionId))) {
+    RejectPromiseWithStateError(
+        aPromiseId, "Failed to send loadSession to CDM process."_ns);
+    return;
+  }
+}
+
+void ChromiumCDMParent::SetServerCertificate(uint32_t aPromiseId,
+                                             const nsTArray<uint8_t>& aCert) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::SetServerCertificate(this=%p)", this);
+  if (mIsShutdown) {
+    RejectPromiseShutdown(aPromiseId);
+    return;
+  }
+  if (!SendSetServerCertificate(aPromiseId, aCert)) {
+    RejectPromiseWithStateError(
+        aPromiseId, "Failed to send setServerCertificate to CDM process"_ns);
+  }
+}
+
+void ChromiumCDMParent::UpdateSession(const nsCString& aSessionId,
+                                      uint32_t aPromiseId,
+                                      const nsTArray<uint8_t>& aResponse) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::UpdateSession(this=%p)", this);
+  if (mIsShutdown) {
+    RejectPromiseShutdown(aPromiseId);
+    return;
+  }
+  if (!SendUpdateSession(aPromiseId, aSessionId, aResponse)) {
+    RejectPromiseWithStateError(
+        aPromiseId, "Failed to send updateSession to CDM process"_ns);
+  }
+}
+
+void ChromiumCDMParent::CloseSession(const nsCString& aSessionId,
+                                     uint32_t aPromiseId) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::CloseSession(this=%p)", this);
+  if (mIsShutdown) {
+    RejectPromiseShutdown(aPromiseId);
+    return;
+  }
+  if (!SendCloseSession(aPromiseId, aSessionId)) {
+    RejectPromiseWithStateError(
+        aPromiseId, "Failed to send closeSession to CDM process"_ns);
+  }
+}
+
+void ChromiumCDMParent::RemoveSession(const nsCString& aSessionId,
+                                      uint32_t aPromiseId) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RemoveSession(this=%p)", this);
+  if (mIsShutdown) {
+    RejectPromiseShutdown(aPromiseId);
+    return;
+  }
+  if (!SendRemoveSession(aPromiseId, aSessionId)) {
+    RejectPromiseWithStateError(
+        aPromiseId, "Failed to send removeSession to CDM process"_ns);
+  }
+}
+
+void ChromiumCDMParent::NotifyOutputProtectionStatus(bool aSuccess,
+                                                     uint32_t aLinkMask,
+                                                     uint32_t aProtectionMask) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::NotifyOutputProtectionStatus(this=%p)",
+                this);
+  if (mIsShutdown) {
+    return;
+  }
+  const bool haveCachedValue = mOutputProtectionLinkMask.isSome();
+  if (mAwaitingOutputProtectionInformation && !aSuccess) {
+    MOZ_DIAGNOSTIC_ASSERT(
+        !haveCachedValue,
+        "Should not have a cached value if we're still awaiting infomation");
+    // We're awaiting info and don't yet have a cached value, and the check
+    // failed, don't cache the result, just forward the failure.
+    CompleteQueryOutputProtectionStatus(false, aLinkMask, aProtectionMask);
+    return;
+  }
+  if (!mAwaitingOutputProtectionInformation && haveCachedValue && !aSuccess) {
+    // We're not awaiting info, already have a cached value, and the check
+    // failed. Ignore this, we'll update our info from any future successful
+    // checks.
+    return;
+  }
+  MOZ_ASSERT(aSuccess, "Failed checks should be handled by this point");
+  // Update our protection information.
+  mOutputProtectionLinkMask = Some(aLinkMask);
+
+  if (mAwaitingOutputProtectionInformation) {
+    // If we have an outstanding query, service that query with this
+    // information.
+    mAwaitingOutputProtectionInformation = false;
+    MOZ_ASSERT(!haveCachedValue,
+               "If we were waiting on information, we shouldn't have yet "
+               "cached a value");
+    CompleteQueryOutputProtectionStatus(true, mOutputProtectionLinkMask.value(),
+                                        aProtectionMask);
+  }
+}
+
+void ChromiumCDMParent::CompleteQueryOutputProtectionStatus(
+    bool aSuccess, uint32_t aLinkMask, uint32_t aProtectionMask) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::CompleteQueryOutputProtectionStatus(this=%p) "
+      "mIsShutdown=%s aSuccess=%s aLinkMask=%" PRIu32,
+      this, mIsShutdown ? "true" : "false", aSuccess ? "true" : "false",
+      aLinkMask);
+  if (mIsShutdown) {
+    return;
+  }
+  Unused << SendCompleteQueryOutputProtectionStatus(aSuccess, aLinkMask,
+                                                    aProtectionMask);
+}
+
+// See
+// https://cs.chromium.org/chromium/src/media/blink/webcontentdecryptionmodule_impl.cc?l=33-66&rcl=d49aa59ac8c2925d5bec229f3f1906537b6b4547
+static Result<cdm::HdcpVersion, nsresult> ToCDMHdcpVersion(
+    const nsCString& aMinHdcpVersion) {
+  if (aMinHdcpVersion.IsEmpty()) {
+    return cdm::HdcpVersion::kHdcpVersionNone;
+  }
+  if (aMinHdcpVersion.EqualsIgnoreCase("1.0")) {
+    return cdm::HdcpVersion::kHdcpVersion1_0;
+  }
+  if (aMinHdcpVersion.EqualsIgnoreCase("1.1")) {
+    return cdm::HdcpVersion::kHdcpVersion1_1;
+  }
+  if (aMinHdcpVersion.EqualsIgnoreCase("1.2")) {
+    return cdm::HdcpVersion::kHdcpVersion1_2;
+  }
+  if (aMinHdcpVersion.EqualsIgnoreCase("1.3")) {
+    return cdm::HdcpVersion::kHdcpVersion1_3;
+  }
+  if (aMinHdcpVersion.EqualsIgnoreCase("1.4")) {
+    return cdm::HdcpVersion::kHdcpVersion1_4;
+  }
+  if (aMinHdcpVersion.EqualsIgnoreCase("2.0")) {
+    return cdm::HdcpVersion::kHdcpVersion2_0;
+  }
+  if (aMinHdcpVersion.EqualsIgnoreCase("2.1")) {
+    return cdm::HdcpVersion::kHdcpVersion2_1;
+  }
+  if (aMinHdcpVersion.EqualsIgnoreCase("2.2")) {
+    return cdm::HdcpVersion::kHdcpVersion2_2;
+  }
+  // When adding another version remember to update GMPMessageUtils so that we
+  // can serialize it correctly and have correct bounds on the enum!
+
+  // Invalid hdcp version string.
+  return Err(NS_ERROR_INVALID_ARG);
+}
+
+void ChromiumCDMParent::GetStatusForPolicy(uint32_t aPromiseId,
+                                           const nsCString& aMinHdcpVersion) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::GetStatusForPolicy(this=%p)", this);
+  if (mIsShutdown) {
+    RejectPromiseShutdown(aPromiseId);
+    return;
+  }
+  auto hdcpVersionResult = ToCDMHdcpVersion(aMinHdcpVersion);
+  if (hdcpVersionResult.isErr()) {
+    ErrorResult rv;
+    // XXXbz there's no spec for this yet, and
+    // <https://github.com/WICG/hdcp-detection/blob/master/explainer.md>
+    // does not define what exceptions get thrown.  Let's assume
+    // TypeError for invalid args, as usual.
+    constexpr auto err =
+        "getStatusForPolicy failed due to bad hdcp version argument"_ns;
+    rv.ThrowTypeError(err);
+    RejectPromise(aPromiseId, std::move(rv), err);
+    return;
+  }
+
+  if (!SendGetStatusForPolicy(aPromiseId, hdcpVersionResult.unwrap())) {
+    RejectPromiseWithStateError(
+        aPromiseId, "Failed to send getStatusForPolicy to CDM process"_ns);
+  }
+}
+
+bool ChromiumCDMParent::InitCDMInputBuffer(gmp::CDMInputBuffer& aBuffer,
+                                           MediaRawData* aSample) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  const CryptoSample& crypto = aSample->mCrypto;
+  if (crypto.mEncryptedSizes.Length() != crypto.mPlainSizes.Length()) {
+    GMP_LOG_DEBUG("InitCDMInputBuffer clear/cipher subsamples don't match");
+    return false;
+  }
+
+  Shmem shmem;
+  if (!AllocShmem(aSample->Size(), &shmem)) {
+    return false;
+  }
+  memcpy(shmem.get<uint8_t>(), aSample->Data(), aSample->Size());
+  cdm::EncryptionScheme encryptionScheme = cdm::EncryptionScheme::kUnencrypted;
+  switch (crypto.mCryptoScheme) {
+    case CryptoScheme::None:
+      break;  // Default to none
+    case CryptoScheme::Cenc:
+      encryptionScheme = cdm::EncryptionScheme::kCenc;
+      break;
+    case CryptoScheme::Cbcs:
+      encryptionScheme = cdm::EncryptionScheme::kCbcs;
+      break;
+    default:
+      GMP_LOG_DEBUG(
+          "InitCDMInputBuffer got unexpected encryption scheme with "
+          "value of %" PRIu8 ". Treating as no encryption.",
+          static_cast<uint8_t>(crypto.mCryptoScheme));
+      MOZ_ASSERT_UNREACHABLE("Should not have unrecognized encryption type");
+      break;
+  }
+
+  const nsTArray<uint8_t>& iv = encryptionScheme != cdm::EncryptionScheme::kCbcs
+                                    ? crypto.mIV
+                                    : crypto.mConstantIV;
+  aBuffer = gmp::CDMInputBuffer(
+      shmem, crypto.mKeyId, iv, aSample->mTime.ToMicroseconds(),
+      aSample->mDuration.ToMicroseconds(), crypto.mPlainSizes,
+      crypto.mEncryptedSizes, crypto.mCryptByteBlock, crypto.mSkipByteBlock,
+      encryptionScheme);
+  return true;
+}
+
+bool ChromiumCDMParent::SendBufferToCDM(uint32_t aSizeInBytes) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::SendBufferToCDM() size=%" PRIu32,
+                aSizeInBytes);
+  Shmem shmem;
+  if (!AllocShmem(aSizeInBytes, &shmem)) {
+    return false;
+  }
+  if (!SendGiveBuffer(std::move(shmem))) {
+    DeallocShmem(shmem);
+    return false;
+  }
+  return true;
+}
+
+RefPtr<DecryptPromise> ChromiumCDMParent::Decrypt(MediaRawData* aSample) {
+  if (mIsShutdown) {
+    MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+    return DecryptPromise::CreateAndReject(DecryptResult(GenericErr, aSample),
+                                           __func__);
+  }
+  CDMInputBuffer buffer;
+  if (!InitCDMInputBuffer(buffer, aSample)) {
+    return DecryptPromise::CreateAndReject(DecryptResult(GenericErr, aSample),
+                                           __func__);
+  }
+  // Send a buffer to the CDM to store the output. The CDM will either fill
+  // it with the decrypted sample and return it, or deallocate it on failure.
+  if (!SendBufferToCDM(aSample->Size())) {
+    DeallocShmem(buffer.mData());
+    return DecryptPromise::CreateAndReject(DecryptResult(GenericErr, aSample),
+                                           __func__);
+  }
+
+  RefPtr<DecryptJob> job = new DecryptJob(aSample);
+  if (!SendDecrypt(job->mId, buffer)) {
+    GMP_LOG_DEBUG(
+        "ChromiumCDMParent::Decrypt(this=%p) failed to send decrypt message",
+        this);
+    DeallocShmem(buffer.mData());
+    return DecryptPromise::CreateAndReject(DecryptResult(GenericErr, aSample),
+                                           __func__);
+  }
+  RefPtr<DecryptPromise> promise = job->Ensure();
+  mDecrypts.AppendElement(job);
+  return promise;
+}
+
+ipc::IPCResult ChromiumCDMParent::Recv__delete__() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  MOZ_ASSERT(mIsShutdown);
+  GMP_LOG_DEBUG("ChromiumCDMParent::Recv__delete__(this=%p)", this);
+  if (mContentParent) {
+    mContentParent->ChromiumCDMDestroyed(this);
+    mContentParent = nullptr;
+  }
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnResolvePromiseWithKeyStatus(
+    const uint32_t& aPromiseId, const uint32_t& aKeyStatus) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::RecvOnResolvePromiseWithKeyStatus(this=%p, "
+      "pid=%" PRIu32 ", keystatus=%" PRIu32 ")",
+      this, aPromiseId, aKeyStatus);
+  if (!mCDMCallback || mIsShutdown) {
+    return IPC_OK();
+  }
+
+  mCDMCallback->ResolvePromiseWithKeyStatus(aPromiseId, aKeyStatus);
+
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnResolveNewSessionPromise(
+    const uint32_t& aPromiseId, const nsCString& aSessionId) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::RecvOnResolveNewSessionPromise(this=%p, pid=%" PRIu32
+      ", sid=%s)",
+      this, aPromiseId, aSessionId.get());
+  if (!mCDMCallback || mIsShutdown) {
+    return IPC_OK();
+  }
+
+  Maybe<uint32_t> token = mPromiseToCreateSessionToken.Extract(aPromiseId);
+  if (token.isNothing()) {
+    RejectPromiseWithStateError(aPromiseId,
+                                "Lost session token for new session."_ns);
+    return IPC_OK();
+  }
+
+  mCDMCallback->SetSessionId(token.value(), aSessionId);
+
+  ResolvePromise(aPromiseId);
+
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvResolveLoadSessionPromise(
+    const uint32_t& aPromiseId, const bool& aSuccessful) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::RecvResolveLoadSessionPromise(this=%p, pid=%" PRIu32
+      ", successful=%d)",
+      this, aPromiseId, aSuccessful);
+  if (!mCDMCallback || mIsShutdown) {
+    return IPC_OK();
+  }
+
+  mCDMCallback->ResolveLoadSessionPromise(aPromiseId, aSuccessful);
+
+  return IPC_OK();
+}
+
+void ChromiumCDMParent::ResolvePromise(uint32_t aPromiseId) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::ResolvePromise(this=%p, pid=%" PRIu32 ")",
+                this, aPromiseId);
+
+  // Note: The MediaKeys rejects all pending DOM promises when it
+  // initiates shutdown.
+  if (!mCDMCallback || mIsShutdown) {
+    return;
+  }
+
+  mCDMCallback->ResolvePromise(aPromiseId);
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnResolvePromise(
+    const uint32_t& aPromiseId) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  ResolvePromise(aPromiseId);
+  return IPC_OK();
+}
+
+void ChromiumCDMParent::RejectPromise(uint32_t aPromiseId,
+                                      ErrorResult&& aException,
+                                      const nsCString& aErrorMessage) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RejectPromise(this=%p, pid=%" PRIu32 ")",
+                this, aPromiseId);
+  // Note: The MediaKeys rejects all pending DOM promises when it
+  // initiates shutdown.
+  if (!mCDMCallback || mIsShutdown) {
+    // Suppress the exception as it will not be explicitly handled due to the
+    // early return.
+    aException.SuppressException();
+    return;
+  }
+
+  mCDMCallback->RejectPromise(aPromiseId, std::move(aException), aErrorMessage);
+}
+
+void ChromiumCDMParent::RejectPromiseShutdown(uint32_t aPromiseId) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  RejectPromiseWithStateError(aPromiseId, "CDM is shutdown"_ns);
+}
+
+void ChromiumCDMParent::RejectPromiseWithStateError(
+    uint32_t aPromiseId, const nsCString& aErrorMessage) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  ErrorResult rv;
+  rv.ThrowInvalidStateError(aErrorMessage);
+  RejectPromise(aPromiseId, std::move(rv), aErrorMessage);
+}
+
+static ErrorResult ToErrorResult(uint32_t aException,
+                                 const nsCString& aErrorMessage) {
+  // XXXbz could we have a CopyableErrorResult sent to us with a better error
+  // message?
+  ErrorResult rv;
+  switch (static_cast<cdm::Exception>(aException)) {
+    case cdm::Exception::kExceptionNotSupportedError:
+      rv.ThrowNotSupportedError(aErrorMessage);
+      break;
+    case cdm::Exception::kExceptionInvalidStateError:
+      rv.ThrowInvalidStateError(aErrorMessage);
+      break;
+    case cdm::Exception::kExceptionTypeError:
+      rv.ThrowTypeError(aErrorMessage);
+      break;
+    case cdm::Exception::kExceptionQuotaExceededError:
+      rv.ThrowQuotaExceededError(aErrorMessage);
+      break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("Invalid cdm::Exception enum value.");
+      // Note: Unique placeholder.
+      rv.ThrowTimeoutError(aErrorMessage);
+  };
+  return rv;
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnRejectPromise(
+    const uint32_t& aPromiseId, const uint32_t& aException,
+    const uint32_t& aSystemCode, const nsCString& aErrorMessage) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  RejectPromise(aPromiseId, ToErrorResult(aException, aErrorMessage),
+                aErrorMessage);
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnSessionMessage(
+    const nsCString& aSessionId, const uint32_t& aMessageType,
+    nsTArray<uint8_t>&& aMessage) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvOnSessionMessage(this=%p, sid=%s)",
+                this, aSessionId.get());
+  if (!mCDMCallback || mIsShutdown) {
+    return IPC_OK();
+  }
+
+  mCDMCallback->SessionMessage(aSessionId, aMessageType, std::move(aMessage));
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnSessionKeysChange(
+    const nsCString& aSessionId, nsTArray<CDMKeyInformation>&& aKeysInfo) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvOnSessionKeysChange(this=%p)", this);
+  if (!mCDMCallback || mIsShutdown) {
+    return IPC_OK();
+  }
+
+  mCDMCallback->SessionKeysChange(aSessionId, std::move(aKeysInfo));
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnExpirationChange(
+    const nsCString& aSessionId, const double& aSecondsSinceEpoch) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvOnExpirationChange(this=%p) time=%lf",
+                this, aSecondsSinceEpoch);
+  if (!mCDMCallback || mIsShutdown) {
+    return IPC_OK();
+  }
+
+  mCDMCallback->ExpirationChange(aSessionId, aSecondsSinceEpoch);
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnSessionClosed(
+    const nsCString& aSessionId) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvOnSessionClosed(this=%p)", this);
+  if (!mCDMCallback || mIsShutdown) {
+    return IPC_OK();
+  }
+
+  mCDMCallback->SessionClosed(aSessionId);
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnQueryOutputProtectionStatus() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::RecvOnQueryOutputProtectionStatus(this=%p) "
+      "mIsShutdown=%s mCDMCallback=%s mAwaitingOutputProtectionInformation=%s",
+      this, mIsShutdown ? "true" : "false", mCDMCallback ? "true" : "false",
+      mAwaitingOutputProtectionInformation ? "true" : "false");
+  if (mIsShutdown) {
+    // We're shutdown, don't try to service the query.
+    return IPC_OK();
+  }
+  if (!mCDMCallback) {
+    // We don't have a callback. We're not yet outputting anything so can report
+    // we're safe.
+    CompleteQueryOutputProtectionStatus(true, uint32_t{}, uint32_t{});
+    return IPC_OK();
+  }
+
+  if (mOutputProtectionLinkMask.isSome()) {
+    MOZ_DIAGNOSTIC_ASSERT(
+        !mAwaitingOutputProtectionInformation,
+        "If we have a cached value we should not be awaiting information");
+    // We have a cached value, use that.
+    CompleteQueryOutputProtectionStatus(true, mOutputProtectionLinkMask.value(),
+                                        uint32_t{});
+    return IPC_OK();
+  }
+
+  // We need to call up the stack to get the info. The CDM proxy will finish
+  // the request via `NotifyOutputProtectionStatus`.
+  mAwaitingOutputProtectionInformation = true;
+  mCDMCallback->QueryOutputProtectionStatus();
+  return IPC_OK();
+}
+
+DecryptStatus ToDecryptStatus(uint32_t aStatus) {
+  switch (static_cast<cdm::Status>(aStatus)) {
+    case cdm::kSuccess:
+      return DecryptStatus::Ok;
+    case cdm::kNoKey:
+      return DecryptStatus::NoKeyErr;
+    default:
+      return DecryptStatus::GenericErr;
+  }
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvDecryptFailed(const uint32_t& aId,
+                                                    const uint32_t& aStatus) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvDecryptFailed(this=%p, id=%" PRIu32
+                ", status=%" PRIu32 ")",
+                this, aId, aStatus);
+
+  if (mIsShutdown) {
+    MOZ_ASSERT(mDecrypts.IsEmpty());
+    return IPC_OK();
+  }
+
+  for (size_t i = 0; i < mDecrypts.Length(); i++) {
+    if (mDecrypts[i]->mId == aId) {
+      mDecrypts[i]->PostResult(ToDecryptStatus(aStatus));
+      mDecrypts.RemoveElementAt(i);
+      break;
+    }
+  }
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvDecrypted(const uint32_t& aId,
+                                                const uint32_t& aStatus,
+                                                ipc::Shmem&& aShmem) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvDecrypted(this=%p, id=%" PRIu32
+                ", status=%" PRIu32 ")",
+                this, aId, aStatus);
+
+  // We must deallocate the shmem once we've copied the result out of it
+  // in PostResult below.
+  auto autoDeallocateShmem = MakeScopeExit([&, this] { DeallocShmem(aShmem); });
+
+  if (mIsShutdown) {
+    MOZ_ASSERT(mDecrypts.IsEmpty());
+    return IPC_OK();
+  }
+  for (size_t i = 0; i < mDecrypts.Length(); i++) {
+    if (mDecrypts[i]->mId == aId) {
+      mDecrypts[i]->PostResult(
+          ToDecryptStatus(aStatus),
+          Span<const uint8_t>(aShmem.get<uint8_t>(), aShmem.Size<uint8_t>()));
+      mDecrypts.RemoveElementAt(i);
+      break;
+    }
+  }
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvIncreaseShmemPoolSize() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("%s(this=%p) limit=%" PRIu32 " active=%" PRIu32, __func__, this,
+                mVideoShmemLimit, mVideoShmemsActive);
+
+  // Put an upper limit on the number of shmems we tolerate the CDM asking
+  // for, to prevent a memory blow-out. In practice, we expect the CDM to
+  // need less than 5, but some encodings require more.
+  // We'd expect CDMs to not have video frames larger than 720p-1080p
+  // (due to DRM robustness requirements), which is about 1.5MB-3MB per
+  // frame.
+  if (mVideoShmemLimit > 50) {
+    mDecodePromise.RejectIfExists(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("Failled to ensure CDM has enough shmems.")),
+        __func__);
+    Shutdown();
+    return IPC_OK();
+  }
+  mVideoShmemLimit++;
+
+  EnsureSufficientShmems(mVideoFrameBufferSize);
+
+  return IPC_OK();
+}
+
+bool ChromiumCDMParent::PurgeShmems() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::PurgeShmems(this=%p) frame_size=%zu"
+      " limit=%" PRIu32 " active=%" PRIu32,
+      this, mVideoFrameBufferSize, mVideoShmemLimit, mVideoShmemsActive);
+
+  if (mVideoShmemsActive == 0) {
+    // We haven't allocated any shmems, nothing to do here.
+    return true;
+  }
+  if (!SendPurgeShmems()) {
+    return false;
+  }
+  mVideoShmemsActive = 0;
+  return true;
+}
+
+bool ChromiumCDMParent::EnsureSufficientShmems(size_t aVideoFrameSize) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::EnsureSufficientShmems(this=%p) "
+      "size=%zu expected_size=%zu limit=%" PRIu32 " active=%" PRIu32,
+      this, aVideoFrameSize, mVideoFrameBufferSize, mVideoShmemLimit,
+      mVideoShmemsActive);
+
+  // The Chromium CDM API requires us to implement a synchronous
+  // interface to supply buffers to the CDM for it to write decrypted samples
+  // into. We want our buffers to be backed by shmems, in order to reduce
+  // the overhead of transferring decoded frames. However due to sandboxing
+  // restrictions, the CDM process cannot allocate shmems itself.
+  // We don't want to be doing synchronous IPC to request shmems from the
+  // content process, nor do we want to have to do intr IPC or make async
+  // IPC conform to the sync allocation interface. So instead we have the
+  // content process pre-allocate a set of shmems and give them to the CDM
+  // process in advance of them being needed.
+  //
+  // When the CDM needs to allocate a buffer for storing a decoded video
+  // frame, the CDM host gives it one of these shmems' buffers. When this
+  // is sent back to the content process, we upload it to a GPU surface,
+  // and send the shmem back to the CDM process so it can reuse it.
+  //
+  // Normally the CDM won't allocate more than one buffer at once, but
+  // we've seen cases where it allocates multiple buffers, returns one and
+  // holds onto the rest. So we need to ensure we have several extra
+  // shmems pre-allocated for the CDM. This threshold is set by the pref
+  // media.eme.chromium-api.video-shmems.
+  //
+  // We also have a failure recovery mechanism; if the CDM asks for more
+  // buffers than we have shmem's available, ChromiumCDMChild gives the
+  // CDM a non-shared memory buffer, and returns the frame to the parent
+  // in an nsTArray<uint8_t> instead of a shmem. The child then sends a
+  // message to the parent asking it to increase the number of shmems in
+  // the pool. Via this mechanism we should recover from incorrectly
+  // predicting how many shmems to pre-allocate.
+  //
+  // At decoder start up, we guess how big the shmems need to be based on
+  // the video frame dimensions. If we guess wrong, the CDM will follow
+  // the non-shmem path, and we'll re-create the shmems of the correct size.
+  // This meanns we can recover from guessing the shmem size wrong.
+  // We must re-take this path after every decoder de-init/re-init, as the
+  // frame sizes should change every time we switch video stream.
+
+  if (mVideoFrameBufferSize < aVideoFrameSize) {
+    if (!PurgeShmems()) {
+      return false;
+    }
+    mVideoFrameBufferSize = aVideoFrameSize;
+  }
+
+  while (mVideoShmemsActive < mVideoShmemLimit) {
+    if (!SendBufferToCDM(mVideoFrameBufferSize)) {
+      return false;
+    }
+    mVideoShmemsActive++;
+  }
+
+  return true;
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvDecodedData(const CDMVideoFrame& aFrame,
+                                                  nsTArray<uint8_t>&& aData) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvDecodedData(this=%p) time=%" PRId64,
+                this, aFrame.mTimestamp());
+
+  if (mIsShutdown || mDecodePromise.IsEmpty()) {
+    return IPC_OK();
+  }
+
+  if (!EnsureSufficientShmems(aData.Length())) {
+    mDecodePromise.RejectIfExists(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("Failled to ensure CDM has enough shmems.")),
+        __func__);
+    return IPC_OK();
+  }
+
+  RefPtr<VideoData> v = CreateVideoFrame(aFrame, aData);
+  if (!v) {
+    mDecodePromise.RejectIfExists(
+        MediaResult(NS_ERROR_OUT_OF_MEMORY,
+                    RESULT_DETAIL("Can't create VideoData")),
+        __func__);
+    return IPC_OK();
+  }
+
+  ReorderAndReturnOutput(std::move(v));
+
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvDecodedShmem(const CDMVideoFrame& aFrame,
+                                                   ipc::Shmem&& aShmem) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvDecodedShmem(this=%p) time=%" PRId64
+                " duration=%" PRId64,
+                this, aFrame.mTimestamp(), aFrame.mDuration());
+
+  // On failure we need to deallocate the shmem we're to return to the
+  // CDM. On success we return it to the CDM to be reused.
+  auto autoDeallocateShmem =
+      MakeScopeExit([&, this] { this->DeallocShmem(aShmem); });
+
+  if (mIsShutdown || mDecodePromise.IsEmpty()) {
+    return IPC_OK();
+  }
+
+  RefPtr<VideoData> v = CreateVideoFrame(
+      aFrame, Span<uint8_t>(aShmem.get<uint8_t>(), aShmem.Size<uint8_t>()));
+  if (!v) {
+    mDecodePromise.RejectIfExists(
+        MediaResult(NS_ERROR_OUT_OF_MEMORY,
+                    RESULT_DETAIL("Can't create VideoData")),
+        __func__);
+    return IPC_OK();
+  }
+
+  // Return the shmem to the CDM so the shmem can be reused to send us
+  // another frame.
+  if (!SendGiveBuffer(std::move(aShmem))) {
+    mDecodePromise.RejectIfExists(
+        MediaResult(NS_ERROR_OUT_OF_MEMORY,
+                    RESULT_DETAIL("Can't return shmem to CDM process")),
+        __func__);
+    return IPC_OK();
+  }
+
+  // Don't need to deallocate the shmem since the CDM process is responsible
+  // for it again.
+  autoDeallocateShmem.release();
+
+  ReorderAndReturnOutput(std::move(v));
+
+  return IPC_OK();
+}
+
+void ChromiumCDMParent::ReorderAndReturnOutput(RefPtr<VideoData>&& aFrame) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  if (mMaxRefFrames == 0) {
+    mDecodePromise.ResolveIfExists(
+        MediaDataDecoder::DecodedData({std::move(aFrame)}), __func__);
+    return;
+  }
+  mReorderQueue.Push(std::move(aFrame));
+  MediaDataDecoder::DecodedData results;
+  while (mReorderQueue.Length() > mMaxRefFrames) {
+    results.AppendElement(mReorderQueue.Pop());
+  }
+  mDecodePromise.Resolve(std::move(results), __func__);
+}
+
+already_AddRefed<VideoData> ChromiumCDMParent::CreateVideoFrame(
+    const CDMVideoFrame& aFrame, Span<uint8_t> aData) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  VideoData::YCbCrBuffer b;
+  MOZ_ASSERT(aData.Length() > 0);
+
+  // Since we store each plane separately we can just roll the offset
+  // into our pointer to that plane and store that.
+  b.mPlanes[0].mData = aData.Elements() + aFrame.mYPlane().mPlaneOffset();
+  b.mPlanes[0].mWidth = aFrame.mImageWidth();
+  b.mPlanes[0].mHeight = aFrame.mImageHeight();
+  b.mPlanes[0].mStride = aFrame.mYPlane().mStride();
+  b.mPlanes[0].mSkip = 0;
+
+  b.mPlanes[1].mData = aData.Elements() + aFrame.mUPlane().mPlaneOffset();
+  b.mPlanes[1].mWidth = (aFrame.mImageWidth() + 1) / 2;
+  b.mPlanes[1].mHeight = (aFrame.mImageHeight() + 1) / 2;
+  b.mPlanes[1].mStride = aFrame.mUPlane().mStride();
+  b.mPlanes[1].mSkip = 0;
+
+  b.mPlanes[2].mData = aData.Elements() + aFrame.mVPlane().mPlaneOffset();
+  b.mPlanes[2].mWidth = (aFrame.mImageWidth() + 1) / 2;
+  b.mPlanes[2].mHeight = (aFrame.mImageHeight() + 1) / 2;
+  b.mPlanes[2].mStride = aFrame.mVPlane().mStride();
+  b.mPlanes[2].mSkip = 0;
+
+  b.mChromaSubsampling = gfx::ChromaSubsampling::HALF_WIDTH_AND_HEIGHT;
+
+  // We unfortunately can't know which colorspace the video is using at this
+  // stage.
+  b.mYUVColorSpace =
+      DefaultColorSpace({aFrame.mImageWidth(), aFrame.mImageHeight()});
+
+  gfx::IntRect pictureRegion(0, 0, aFrame.mImageWidth(), aFrame.mImageHeight());
+  RefPtr<VideoData> v = VideoData::CreateAndCopyData(
+      mVideoInfo, mImageContainer, mLastStreamOffset,
+      media::TimeUnit::FromMicroseconds(aFrame.mTimestamp()),
+      media::TimeUnit::FromMicroseconds(aFrame.mDuration()), b, false,
+      media::TimeUnit::FromMicroseconds(-1), pictureRegion, mKnowsCompositor);
+
+  if (!v || !v->mImage) {
+    NS_WARNING("Failed to decode video frame.");
+    return v.forget();
+  }
+
+  // This is a DRM image.
+  v->mImage->SetIsDRM(true);
+
+  return v.forget();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvDecodeFailed(const uint32_t& aStatus) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvDecodeFailed(this=%p status=%" PRIu32
+                ")",
+                this, aStatus);
+  if (mIsShutdown) {
+    MOZ_ASSERT(mDecodePromise.IsEmpty());
+    return IPC_OK();
+  }
+
+  if (aStatus == cdm::kNeedMoreData) {
+    mDecodePromise.ResolveIfExists(nsTArray<RefPtr<MediaData>>(), __func__);
+    return IPC_OK();
+  }
+
+  mDecodePromise.RejectIfExists(
+      MediaResult(
+          NS_ERROR_DOM_MEDIA_FATAL_ERR,
+          RESULT_DETAIL(
+              "ChromiumCDMParent::RecvDecodeFailed with status %s (%" PRIu32
+              ")",
+              CdmStatusToString(aStatus), aStatus)),
+      __func__);
+  return IPC_OK();
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvShutdown() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::RecvShutdown(this=%p)", this);
+  Shutdown();
+  return IPC_OK();
+}
+
+void ChromiumCDMParent::ActorDestroy(ActorDestroyReason aWhy) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::ActorDestroy(this=%p, reason=%d)", this,
+                aWhy);
+  MOZ_ASSERT(!mActorDestroyed);
+  mActorDestroyed = true;
+  // Shutdown() will clear mCDMCallback, so let's keep a reference for later
+  // use.
+  auto callback = mCDMCallback;
+  if (!mIsShutdown) {
+    // Plugin crash.
+    MOZ_ASSERT(aWhy == AbnormalShutdown);
+    Shutdown();
+  }
+  MOZ_ASSERT(mIsShutdown);
+  RefPtr<ChromiumCDMParent> kungFuDeathGrip(this);
+  if (mContentParent) {
+    mContentParent->ChromiumCDMDestroyed(this);
+    mContentParent = nullptr;
+  }
+  mAbnormalShutdown = (aWhy == AbnormalShutdown);
+  if (mAbnormalShutdown && callback) {
+    callback->Terminated();
+  }
+  MaybeDisconnect(mAbnormalShutdown);
+}
+
+RefPtr<MediaDataDecoder::InitPromise> ChromiumCDMParent::InitializeVideoDecoder(
+    const gmp::CDMVideoDecoderConfig& aConfig, const VideoInfo& aInfo,
+    RefPtr<layers::ImageContainer> aImageContainer,
+    RefPtr<layers::KnowsCompositor> aKnowsCompositor) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  if (mIsShutdown) {
+    return MediaDataDecoder::InitPromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("ChromiumCDMParent is shutdown")),
+        __func__);
+  }
+
+  // The Widevine CDM version 1.4.8.970 and above contain a video decoder that
+  // does not optimally allocate video frames; it requests buffers much larger
+  // than required. The exact formula the CDM uses to calculate their frame
+  // sizes isn't obvious, but they normally request around or slightly more
+  // than 1.5X the optimal amount. So pad the size of buffers we allocate so
+  // that we're likely to have buffers big enough to accomodate the CDM's weird
+  // frame size calculation.
+  const size_t bufferSize =
+      1.7 * I420FrameBufferSizePadded(aInfo.mImage.width, aInfo.mImage.height);
+  if (bufferSize <= 0) {
+    return MediaDataDecoder::InitPromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("Video frame buffer size is invalid.")),
+        __func__);
+  }
+
+  if (!EnsureSufficientShmems(bufferSize)) {
+    return MediaDataDecoder::InitPromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("Failed to init shmems for video decoder")),
+        __func__);
+  }
+
+  if (!SendInitializeVideoDecoder(aConfig)) {
+    return MediaDataDecoder::InitPromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("Failed to send init video decoder to CDM")),
+        __func__);
+  }
+
+  mMaxRefFrames = (aConfig.mCodec() == cdm::VideoCodec::kCodecH264)
+                      ? H264::HasSPS(aInfo.mExtraData)
+                            ? H264::ComputeMaxRefFrames(aInfo.mExtraData)
+                            : 16
+                      : 0;
+
+  mVideoDecoderInitialized = true;
+  mImageContainer = aImageContainer;
+  mKnowsCompositor = aKnowsCompositor;
+  mVideoInfo = aInfo;
+  mVideoFrameBufferSize = bufferSize;
+
+  return mInitVideoDecoderPromise.Ensure(__func__);
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvOnDecoderInitDone(
+    const uint32_t& aStatus) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "ChromiumCDMParent::RecvOnDecoderInitDone(this=%p, status=%" PRIu32 ")",
+      this, aStatus);
+  if (mIsShutdown) {
+    MOZ_ASSERT(mInitVideoDecoderPromise.IsEmpty());
+    return IPC_OK();
+  }
+  if (aStatus == static_cast<uint32_t>(cdm::kSuccess)) {
+    mInitVideoDecoderPromise.ResolveIfExists(TrackInfo::kVideoTrack, __func__);
+  } else {
+    mVideoDecoderInitialized = false;
+    mInitVideoDecoderPromise.RejectIfExists(
+        MediaResult(
+            NS_ERROR_DOM_MEDIA_FATAL_ERR,
+            RESULT_DETAIL("CDM init decode failed with status %s (%" PRIu32 ")",
+                          CdmStatusToString(aStatus), aStatus)),
+        __func__);
+  }
+  return IPC_OK();
+}
+
+RefPtr<MediaDataDecoder::DecodePromise>
+ChromiumCDMParent::DecryptAndDecodeFrame(MediaRawData* aSample) {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  if (mIsShutdown) {
+    return MediaDataDecoder::DecodePromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("ChromiumCDMParent is shutdown")),
+        __func__);
+  }
+
+  GMP_LOG_DEBUG("ChromiumCDMParent::DecryptAndDecodeFrame t=%" PRId64,
+                aSample->mTime.ToMicroseconds());
+
+  CDMInputBuffer buffer;
+
+  if (!InitCDMInputBuffer(buffer, aSample)) {
+    return MediaDataDecoder::DecodePromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR, "Failed to init CDM buffer."),
+        __func__);
+  }
+
+  mLastStreamOffset = aSample->mOffset;
+
+  if (!SendDecryptAndDecodeFrame(buffer)) {
+    GMP_LOG_DEBUG(
+        "ChromiumCDMParent::Decrypt(this=%p) failed to send decrypt message.",
+        this);
+    DeallocShmem(buffer.mData());
+    return MediaDataDecoder::DecodePromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    "Failed to send decrypt to CDM process."),
+        __func__);
+  }
+
+  return mDecodePromise.Ensure(__func__);
+}
+
+RefPtr<MediaDataDecoder::FlushPromise> ChromiumCDMParent::FlushVideoDecoder() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  if (mIsShutdown) {
+    MOZ_ASSERT(mReorderQueue.IsEmpty());
+    return MediaDataDecoder::FlushPromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("ChromiumCDMParent is shutdown")),
+        __func__);
+  }
+
+  mReorderQueue.Clear();
+
+  mDecodePromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
+  if (!SendResetVideoDecoder()) {
+    return MediaDataDecoder::FlushPromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    "Failed to send flush to CDM."),
+        __func__);
+  }
+  return mFlushDecoderPromise.Ensure(__func__);
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvResetVideoDecoderComplete() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  MOZ_ASSERT(mReorderQueue.IsEmpty());
+  if (mIsShutdown) {
+    MOZ_ASSERT(mFlushDecoderPromise.IsEmpty());
+    return IPC_OK();
+  }
+  mFlushDecoderPromise.ResolveIfExists(true, __func__);
+  return IPC_OK();
+}
+
+RefPtr<MediaDataDecoder::DecodePromise> ChromiumCDMParent::Drain() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  MOZ_ASSERT(mDecodePromise.IsEmpty(), "Must wait for decoding to complete");
+  if (mIsShutdown) {
+    return MediaDataDecoder::DecodePromise::CreateAndReject(
+        MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                    RESULT_DETAIL("ChromiumCDMParent is shutdown")),
+        __func__);
+  }
+
+  RefPtr<MediaDataDecoder::DecodePromise> p = mDecodePromise.Ensure(__func__);
+  if (!SendDrain()) {
+    mDecodePromise.Resolve(MediaDataDecoder::DecodedData(), __func__);
+  }
+  return p;
+}
+
+ipc::IPCResult ChromiumCDMParent::RecvDrainComplete() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  if (mIsShutdown) {
+    MOZ_ASSERT(mDecodePromise.IsEmpty());
+    return IPC_OK();
+  }
+
+  MediaDataDecoder::DecodedData samples;
+  while (!mReorderQueue.IsEmpty()) {
+    samples.AppendElement(mReorderQueue.Pop());
+  }
+
+  mDecodePromise.ResolveIfExists(std::move(samples), __func__);
+  return IPC_OK();
+}
+RefPtr<ShutdownPromise> ChromiumCDMParent::ShutdownVideoDecoder() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  if (mIsShutdown || !mVideoDecoderInitialized) {
+    return ShutdownPromise::CreateAndResolve(true, __func__);
+  }
+  mInitVideoDecoderPromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED,
+                                          __func__);
+  mDecodePromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
+  MOZ_ASSERT(mFlushDecoderPromise.IsEmpty());
+  if (!SendDeinitializeVideoDecoder()) {
+    return ShutdownPromise::CreateAndResolve(true, __func__);
+  }
+  mVideoDecoderInitialized = false;
+
+  GMP_LOG_DEBUG("ChromiumCDMParent::~ShutdownVideoDecoder(this=%p) ", this);
+
+  // The ChromiumCDMChild will purge its shmems, so if the decoder is
+  // reinitialized the shmems need to be re-allocated, and they may need
+  // to be a different size.
+  mVideoShmemsActive = 0;
+  mVideoFrameBufferSize = 0;
+  return ShutdownPromise::CreateAndResolve(true, __func__);
+}
+
+void ChromiumCDMParent::Shutdown() {
+  MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+  GMP_LOG_DEBUG("ChromiumCDMParent::Shutdown(this=%p)", this);
+
+  if (mIsShutdown) {
+    return;
+  }
+  mIsShutdown = true;
+
+  // If we're shutting down due to the plugin shutting down due to application
+  // shutdown, we should tell the CDM proxy to also shutdown. Otherwise the
+  // proxy will shutdown when the owning MediaKeys is destroyed during cycle
+  // collection, and that will not shut down cleanly as the GMP thread will be
+  // shutdown by then.
+  if (mCDMCallback) {
+    mCDMCallback->Shutdown();
+  }
+
+  // We may be called from a task holding the last reference to the CDM
+  // callback, so let's clear our local weak pointer to ensure it will not be
+  // used afterward (including from an already-queued task, e.g.: ActorDestroy).
+  mCDMCallback = nullptr;
+
+  mReorderQueue.Clear();
+
+  for (RefPtr<DecryptJob>& decrypt : mDecrypts) {
+    decrypt->PostResult(eme::AbortedErr);
+  }
+  mDecrypts.Clear();
+
+  if (mVideoDecoderInitialized && !mActorDestroyed) {
+    Unused << SendDeinitializeVideoDecoder();
+    mVideoDecoderInitialized = false;
+  }
+
+  // Note: MediaKeys rejects all outstanding promises when it initiates
+  // shutdown.
+  mPromiseToCreateSessionToken.Clear();
+
+  mInitPromise.RejectIfExists(
+      MediaResult(NS_ERROR_DOM_ABORT_ERR,
+                  RESULT_DETAIL("ChromiumCDMParent is shutdown")),
+      __func__);
+
+  mInitVideoDecoderPromise.RejectIfExists(
+      MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                  RESULT_DETAIL("ChromiumCDMParent is shutdown")),
+      __func__);
+  mDecodePromise.RejectIfExists(
+      MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                  RESULT_DETAIL("ChromiumCDMParent is shutdown")),
+      __func__);
+  mFlushDecoderPromise.RejectIfExists(
+      MediaResult(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                  RESULT_DETAIL("ChromiumCDMParent is shutdown")),
+      __func__);
+
+  if (!mActorDestroyed) {
+    Unused << SendDestroy();
+  }
+}
+
+}  // namespace mozilla::gmp
+
+#undef NS_DispatchToMainThread
diff --git a/dom/media/gmp/ChromiumCDMParent.h b/dom/media/gmp/ChromiumCDMParent.h
new file mode 100644
index 0000000000..b6c28fb1c5
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMParent.h
@@ -0,0 +1,232 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ChromiumCDMParent_h_
+#define ChromiumCDMParent_h_
+
+#include "DecryptJob.h"
+#include "GMPCrashHelper.h"
+#include "GMPCrashHelperHolder.h"
+#include "GMPMessageUtils.h"
+#include "mozilla/gmp/PChromiumCDMParent.h"
+#include "mozilla/RefPtr.h"
+#include "nsTHashMap.h"
+#include "PlatformDecoderModule.h"
+#include "ImageContainer.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/Span.h"
+#include "ReorderQueue.h"
+
+class ChromiumCDMCallback;
+
+namespace mozilla {
+
+class ErrorResult;
+class MediaRawData;
+class ChromiumCDMProxy;
+
+namespace gmp {
+
+class GMPContentParent;
+
+/**
+ * ChromiumCDMParent is the content process IPC actor used to communicate with a
+ * CDM in the GMP process (where ChromiumCDMChild lives). All non-static
+ * members of this class are GMP thread only.
+ */
+class ChromiumCDMParent final : public PChromiumCDMParent,
+                                public GMPCrashHelperHolder {
+  friend class PChromiumCDMParent;
+
+ public:
+  typedef MozPromise<bool, MediaResult, /* IsExclusive = */ true> InitPromise;
+
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PChromiumCDMParent.
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ChromiumCDMParent, final)
+
+  ChromiumCDMParent(GMPContentParent* aContentParent, uint32_t aPluginId);
+
+  uint32_t PluginId() const { return mPluginId; }
+
+  RefPtr<InitPromise> Init(ChromiumCDMCallback* aCDMCallback,
+                           bool aAllowDistinctiveIdentifier,
+                           bool aAllowPersistentState,
+                           nsIEventTarget* aMainThread);
+
+  void CreateSession(uint32_t aCreateSessionToken, uint32_t aSessionType,
+                     uint32_t aInitDataType, uint32_t aPromiseId,
+                     const nsTArray<uint8_t>& aInitData);
+
+  void LoadSession(uint32_t aPromiseId, uint32_t aSessionType,
+                   nsString aSessionId);
+
+  void SetServerCertificate(uint32_t aPromiseId,
+                            const nsTArray<uint8_t>& aCert);
+
+  void UpdateSession(const nsCString& aSessionId, uint32_t aPromiseId,
+                     const nsTArray<uint8_t>& aResponse);
+
+  void CloseSession(const nsCString& aSessionId, uint32_t aPromiseId);
+
+  void RemoveSession(const nsCString& aSessionId, uint32_t aPromiseId);
+
+  // Notifies this parent of the current output protection status. This will
+  // update cached status and resolve outstanding queries from the CDM if one
+  // exists.
+  void NotifyOutputProtectionStatus(bool aSuccess, uint32_t aLinkMask,
+                                    uint32_t aProtectionMask);
+
+  void GetStatusForPolicy(uint32_t aPromiseId,
+                          const nsCString& aMinHdcpVersion);
+
+  RefPtr<DecryptPromise> Decrypt(MediaRawData* aSample);
+
+  // TODO: Add functions for clients to send data to CDM, and
+  // a Close() function.
+  RefPtr<MediaDataDecoder::InitPromise> InitializeVideoDecoder(
+      const gmp::CDMVideoDecoderConfig& aConfig, const VideoInfo& aInfo,
+      RefPtr<layers::ImageContainer> aImageContainer,
+      RefPtr<layers::KnowsCompositor> aKnowsCompositor);
+
+  RefPtr<MediaDataDecoder::DecodePromise> DecryptAndDecodeFrame(
+      MediaRawData* aSample);
+
+  RefPtr<MediaDataDecoder::FlushPromise> FlushVideoDecoder();
+
+  RefPtr<MediaDataDecoder::DecodePromise> Drain();
+
+  RefPtr<ShutdownPromise> ShutdownVideoDecoder();
+
+  void Shutdown();
+
+ protected:
+  ~ChromiumCDMParent() = default;
+
+  ipc::IPCResult Recv__delete__() override;
+  ipc::IPCResult RecvOnResolvePromiseWithKeyStatus(const uint32_t& aPromiseId,
+                                                   const uint32_t& aKeyStatus);
+  ipc::IPCResult RecvOnResolveNewSessionPromise(const uint32_t& aPromiseId,
+                                                const nsCString& aSessionId);
+  ipc::IPCResult RecvResolveLoadSessionPromise(const uint32_t& aPromiseId,
+                                               const bool& aSuccessful);
+  ipc::IPCResult RecvOnResolvePromise(const uint32_t& aPromiseId);
+  ipc::IPCResult RecvOnRejectPromise(const uint32_t& aPromiseId,
+                                     const uint32_t& aError,
+                                     const uint32_t& aSystemCode,
+                                     const nsCString& aErrorMessage);
+  ipc::IPCResult RecvOnSessionMessage(const nsCString& aSessionId,
+                                      const uint32_t& aMessageType,
+                                      nsTArray<uint8_t>&& aMessage);
+  ipc::IPCResult RecvOnSessionKeysChange(
+      const nsCString& aSessionId, nsTArray<CDMKeyInformation>&& aKeysInfo);
+  ipc::IPCResult RecvOnExpirationChange(const nsCString& aSessionId,
+                                        const double& aSecondsSinceEpoch);
+  ipc::IPCResult RecvOnSessionClosed(const nsCString& aSessionId);
+  ipc::IPCResult RecvOnQueryOutputProtectionStatus();
+  ipc::IPCResult RecvDecrypted(const uint32_t& aId, const uint32_t& aStatus,
+                               ipc::Shmem&& aData);
+  ipc::IPCResult RecvDecryptFailed(const uint32_t& aId,
+                                   const uint32_t& aStatus);
+  ipc::IPCResult RecvOnDecoderInitDone(const uint32_t& aStatus);
+  ipc::IPCResult RecvDecodedShmem(const CDMVideoFrame& aFrame,
+                                  ipc::Shmem&& aShmem);
+  ipc::IPCResult RecvDecodedData(const CDMVideoFrame& aFrame,
+                                 nsTArray<uint8_t>&& aData);
+  ipc::IPCResult RecvDecodeFailed(const uint32_t& aStatus);
+  ipc::IPCResult RecvShutdown();
+  ipc::IPCResult RecvResetVideoDecoderComplete();
+  ipc::IPCResult RecvDrainComplete();
+  ipc::IPCResult RecvIncreaseShmemPoolSize();
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+  bool SendBufferToCDM(uint32_t aSizeInBytes);
+
+  void ReorderAndReturnOutput(RefPtr<VideoData>&& aFrame);
+
+  void RejectPromise(uint32_t aPromiseId, ErrorResult&& aException,
+                     const nsCString& aErrorMessage);
+
+  void ResolvePromise(uint32_t aPromiseId);
+  // Helpers to reject our promise if we are shut down.
+  void RejectPromiseShutdown(uint32_t aPromiseId);
+  // Helper to reject our promise with an InvalidStateError and the given
+  // message.
+  void RejectPromiseWithStateError(uint32_t aPromiseId,
+                                   const nsCString& aErrorMessage);
+
+  // Complete the CDMs request for us to check protection status by responding
+  // to the CDM child with the requested info.
+  void CompleteQueryOutputProtectionStatus(bool aSuccess, uint32_t aLinkMask,
+                                           uint32_t aProtectionMask);
+
+  bool InitCDMInputBuffer(gmp::CDMInputBuffer& aBuffer, MediaRawData* aSample);
+
+  bool PurgeShmems();
+  bool EnsureSufficientShmems(size_t aVideoFrameSize);
+  already_AddRefed<VideoData> CreateVideoFrame(const CDMVideoFrame& aFrame,
+                                               Span<uint8_t> aData);
+
+  const uint32_t mPluginId;
+  GMPContentParent* mContentParent;
+  // Note: this pointer is a weak reference as ChromiumCDMProxy has a strong
+  // reference to the ChromiumCDMCallback.
+  ChromiumCDMCallback* mCDMCallback = nullptr;
+  nsTHashMap<nsUint32HashKey, uint32_t> mPromiseToCreateSessionToken;
+  nsTArray<RefPtr<DecryptJob>> mDecrypts;
+
+  MozPromiseHolder<InitPromise> mInitPromise;
+
+  MozPromiseHolder<MediaDataDecoder::InitPromise> mInitVideoDecoderPromise;
+  MozPromiseHolder<MediaDataDecoder::DecodePromise> mDecodePromise;
+
+  RefPtr<layers::ImageContainer> mImageContainer;
+  RefPtr<layers::KnowsCompositor> mKnowsCompositor;
+  VideoInfo mVideoInfo;
+  uint64_t mLastStreamOffset = 0;
+
+  MozPromiseHolder<MediaDataDecoder::FlushPromise> mFlushDecoderPromise;
+
+  size_t mVideoFrameBufferSize = 0;
+
+  // Count of the number of shmems in the set used to return decoded video
+  // frames from the CDM to Gecko.
+  uint32_t mVideoShmemsActive = 0;
+  // Maximum number of shmems to use to return decoded video frames.
+  uint32_t mVideoShmemLimit;
+
+  // Tracks if we have an outstanding request for output protection information.
+  // This will be set to true if the CDM requests the information and we haven't
+  // yet received it from up the stack and need to query up.
+  bool mAwaitingOutputProtectionInformation = false;
+  // The cached link mask for QueryOutputProtectionStatus related calls. If
+  // this isn't set we'll call up the stack to MediaKeys to request the
+  // information, otherwise we'll use the cached value and rely on MediaKeys
+  // to notify us if the mask changes.
+  Maybe<uint32_t> mOutputProtectionLinkMask;
+
+  bool mIsShutdown = false;
+  bool mVideoDecoderInitialized = false;
+  bool mActorDestroyed = false;
+  bool mAbnormalShutdown = false;
+
+  // The H.264 decoder in Widevine CDM versions 970 and later output in decode
+  // order rather than presentation order, so we reorder in presentation order
+  // before presenting. mMaxRefFrames is non-zero if we have an initialized
+  // decoder and we are decoding H.264. If so, it stores the maximum length of
+  // the reorder queue that we need. Note we may have multiple decoders for the
+  // life time of this object, but never more than one active at once.
+  uint32_t mMaxRefFrames = 0;
+  ReorderQueue mReorderQueue;
+
+#ifdef DEBUG
+  // The GMP thread. Used to MOZ_ASSERT methods run on the GMP thread.
+  const nsCOMPtr<nsISerialEventTarget> mGMPThread;
+#endif
+};
+
+}  // namespace gmp
+}  // namespace mozilla
+
+#endif  // ChromiumCDMParent_h_
diff --git a/dom/media/gmp/ChromiumCDMProxy.cpp b/dom/media/gmp/ChromiumCDMProxy.cpp
new file mode 100644
index 0000000000..1262b173e2
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMProxy.cpp
@@ -0,0 +1,642 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ChromiumCDMProxy.h"
+#include "ChromiumCDMCallbackProxy.h"
+#include "MediaResult.h"
+#include "mozilla/dom/MediaKeySession.h"
+#include "GMPUtils.h"
+#include "nsPrintfCString.h"
+#include "GMPService.h"
+#include "content_decryption_module.h"
+
+#define NS_DispatchToMainThread(...) CompileError_UseAbstractMainThreadInstead
+
+namespace mozilla {
+
+ChromiumCDMProxy::ChromiumCDMProxy(dom::MediaKeys* aKeys,
+                                   const nsAString& aKeySystem,
+                                   GMPCrashHelper* aCrashHelper,
+                                   bool aDistinctiveIdentifierRequired,
+                                   bool aPersistentStateRequired)
+    : CDMProxy(aKeys, aKeySystem, aDistinctiveIdentifierRequired,
+               aPersistentStateRequired),
+      mCrashHelper(aCrashHelper),
+      mCDMMutex("ChromiumCDMProxy"),
+      mGMPThread(GetGMPThread()) {
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+ChromiumCDMProxy::~ChromiumCDMProxy() {
+  EME_LOG("ChromiumCDMProxy::~ChromiumCDMProxy(this=%p)", this);
+}
+
+void ChromiumCDMProxy::Init(PromiseId aPromiseId, const nsAString& aOrigin,
+                            const nsAString& aTopLevelOrigin,
+                            const nsAString& aGMPName) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<GMPCrashHelper> helper(std::move(mCrashHelper));
+
+  NS_ENSURE_TRUE_VOID(!mKeys.IsNull());
+
+  EME_LOG("ChromiumCDMProxy::Init(this=%p, pid=%" PRIu32
+          ", origin=%s, topLevelOrigin=%s, "
+          "gmp=%s)",
+          this, aPromiseId, NS_ConvertUTF16toUTF8(aOrigin).get(),
+          NS_ConvertUTF16toUTF8(aTopLevelOrigin).get(),
+          NS_ConvertUTF16toUTF8(aGMPName).get());
+
+  if (!mGMPThread) {
+    RejectPromiseWithStateError(
+        aPromiseId, "Couldn't get GMP thread ChromiumCDMProxy::Init"_ns);
+    return;
+  }
+
+  if (aGMPName.IsEmpty()) {
+    RejectPromiseWithStateError(
+        aPromiseId, nsPrintfCString("Unknown GMP for keysystem '%s'",
+                                    NS_ConvertUTF16toUTF8(mKeySystem).get()));
+    return;
+  }
+
+  gmp::NodeIdParts nodeIdParts{nsString(aOrigin), nsString(aTopLevelOrigin),
+                               nsString(aGMPName)};
+  nsCOMPtr<nsISerialEventTarget> thread = mGMPThread;
+  RefPtr<ChromiumCDMProxy> self(this);
+  nsCString keySystem = NS_ConvertUTF16toUTF8(mKeySystem);
+  RefPtr<Runnable> task(NS_NewRunnableFunction(
+      "ChromiumCDMProxy::Init",
+      [self, nodeIdParts, helper, aPromiseId, thread, keySystem]() -> void {
+        MOZ_ASSERT(self->IsOnOwnerThread());
+
+        RefPtr<gmp::GeckoMediaPluginService> service =
+            gmp::GeckoMediaPluginService::GetGeckoMediaPluginService();
+        if (!service) {
+          self->RejectPromiseWithStateError(
+              aPromiseId,
+              nsLiteralCString("Couldn't get GeckoMediaPluginService in "
+                               "ChromiumCDMProxy::Init"));
+          return;
+        }
+        RefPtr<gmp::GetCDMParentPromise> promise =
+            service->GetCDM(nodeIdParts, keySystem, helper);
+        promise->Then(
+            thread, __func__,
+            [self, aPromiseId, thread](RefPtr<gmp::ChromiumCDMParent> cdm) {
+              // service->GetCDM succeeded
+              self->mCallback =
+                  MakeUnique<ChromiumCDMCallbackProxy>(self, self->mMainThread);
+              cdm->Init(self->mCallback.get(),
+                        self->mDistinctiveIdentifierRequired,
+                        self->mPersistentStateRequired, self->mMainThread)
+                  ->Then(
+                      self->mMainThread, __func__,
+                      [self, aPromiseId, cdm](bool /* unused */) {
+                        // CDM init succeeded
+                        {
+                          MutexAutoLock lock(self->mCDMMutex);
+                          self->mCDM = cdm;
+                        }
+                        if (self->mIsShutdown) {
+                          self->RejectPromiseWithStateError(
+                              aPromiseId, nsLiteralCString(
+                                              "ChromiumCDMProxy shutdown "
+                                              "during ChromiumCDMProxy::Init"));
+                          // If shutdown happened while waiting to init, we
+                          // need to explicitly shutdown the CDM to avoid it
+                          // referencing this proxy which is on its way out.
+                          self->ShutdownCDMIfExists();
+                          return;
+                        }
+                        self->OnCDMCreated(aPromiseId);
+                      },
+                      [self, aPromiseId](MediaResult aResult) {
+                        // CDM init failed.
+                        ErrorResult rv;
+                        // XXXbz MediaResult should really store a
+                        // CopyableErrorResult or something.  See
+                        // <https://bugzilla.mozilla.org/show_bug.cgi?id=1612216>.
+                        rv.Throw(aResult.Code());
+                        self->RejectPromise(aPromiseId, std::move(rv),
+                                            aResult.Message());
+                      });
+            },
+            [self, aPromiseId](MediaResult rv) {
+              // service->GetCDM failed
+              ErrorResult result;
+              // XXXbz MediaResult should really store a CopyableErrorResult or
+              // something.  See
+              // <https://bugzilla.mozilla.org/show_bug.cgi?id=1612216>.
+              result.Throw(rv.Code());
+              self->RejectPromise(aPromiseId, std::move(result),
+                                  rv.Description());
+            });
+      }));
+
+  mGMPThread->Dispatch(task.forget());
+}
+
+void ChromiumCDMProxy::OnCDMCreated(uint32_t aPromiseId) {
+  EME_LOG("ChromiumCDMProxy::OnCDMCreated(this=%p, pid=%" PRIu32
+          ") isMainThread=%d",
+          this, aPromiseId, NS_IsMainThread());
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mKeys.IsNull()) {
+    return;
+  }
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  // This should only be called once the CDM has been created.
+  MOZ_ASSERT(cdm);
+  if (cdm) {
+    mKeys->OnCDMCreated(aPromiseId, cdm->PluginId());
+  } else {
+    // No CDM? Shouldn't be possible, but reject the promise anyway...
+    constexpr auto err = "Null CDM in OnCDMCreated()"_ns;
+    ErrorResult rv;
+    rv.ThrowInvalidStateError(err);
+    mKeys->RejectPromise(aPromiseId, std::move(rv), err);
+  }
+}
+
+void ChromiumCDMProxy::ShutdownCDMIfExists() {
+  EME_LOG(
+      "ChromiumCDMProxy::ShutdownCDMIfExists(this=%p) mCDM=%p, mIsShutdown=%s",
+      this, mCDM.get(), mIsShutdown ? "true" : "false");
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mGMPThread);
+  MOZ_ASSERT(mIsShutdown,
+             "Should only shutdown the CDM if the proxy is shutting down");
+  RefPtr<gmp::ChromiumCDMParent> cdm;
+  {
+    MutexAutoLock lock(mCDMMutex);
+    cdm.swap(mCDM);
+  }
+  if (cdm) {
+    // We need to keep this proxy alive until the parent has finished its
+    // Shutdown (as it may still try to use the proxy until then).
+    RefPtr<ChromiumCDMProxy> self(this);
+    nsCOMPtr<nsIRunnable> task = NS_NewRunnableFunction(
+        "ChromiumCDMProxy::Shutdown", [self, cdm]() { cdm->Shutdown(); });
+    mGMPThread->Dispatch(task.forget());
+  }
+}
+
+#ifdef DEBUG
+bool ChromiumCDMProxy::IsOnOwnerThread() {
+  return mGMPThread && mGMPThread->IsOnCurrentThread();
+}
+#endif
+
+static uint32_t ToCDMSessionType(dom::MediaKeySessionType aSessionType) {
+  switch (aSessionType) {
+    case dom::MediaKeySessionType::Temporary:
+      return static_cast<uint32_t>(cdm::kTemporary);
+    case dom::MediaKeySessionType::Persistent_license:
+      return static_cast<uint32_t>(cdm::kPersistentLicense);
+    default:
+      return static_cast<uint32_t>(cdm::kTemporary);
+  };
+};
+
+static uint32_t ToCDMInitDataType(const nsAString& aInitDataType) {
+  if (aInitDataType.EqualsLiteral("cenc")) {
+    return static_cast<uint32_t>(cdm::kCenc);
+  }
+  if (aInitDataType.EqualsLiteral("webm")) {
+    return static_cast<uint32_t>(cdm::kWebM);
+  }
+  if (aInitDataType.EqualsLiteral("keyids")) {
+    return static_cast<uint32_t>(cdm::kKeyIds);
+  }
+  return static_cast<uint32_t>(cdm::kCenc);
+}
+
+void ChromiumCDMProxy::CreateSession(uint32_t aCreateSessionToken,
+                                     dom::MediaKeySessionType aSessionType,
+                                     PromiseId aPromiseId,
+                                     const nsAString& aInitDataType,
+                                     nsTArray<uint8_t>& aInitData) {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::CreateSession(this=%p, token=%" PRIu32
+          ", type=%d, pid=%" PRIu32
+          ") "
+          "initDataLen=%zu",
+          this, aCreateSessionToken, (int)aSessionType, aPromiseId,
+          aInitData.Length());
+
+  uint32_t sessionType = ToCDMSessionType(aSessionType);
+  uint32_t initDataType = ToCDMInitDataType(aInitDataType);
+
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    RejectPromiseWithStateError(aPromiseId, "Null CDM in CreateSession"_ns);
+    return;
+  }
+
+  mGMPThread->Dispatch(NewRunnableMethod<uint32_t, uint32_t, uint32_t, uint32_t,
+                                         nsTArray<uint8_t>>(
+      "gmp::ChromiumCDMParent::CreateSession", cdm,
+      &gmp::ChromiumCDMParent::CreateSession, aCreateSessionToken, sessionType,
+      initDataType, aPromiseId, std::move(aInitData)));
+}
+
+void ChromiumCDMProxy::LoadSession(PromiseId aPromiseId,
+                                   dom::MediaKeySessionType aSessionType,
+                                   const nsAString& aSessionId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    RejectPromiseWithStateError(aPromiseId, "Null CDM in LoadSession"_ns);
+    return;
+  }
+
+  mGMPThread->Dispatch(NewRunnableMethod<uint32_t, uint32_t, nsString>(
+      "gmp::ChromiumCDMParent::LoadSession", cdm,
+      &gmp::ChromiumCDMParent::LoadSession, aPromiseId,
+      ToCDMSessionType(aSessionType), aSessionId));
+}
+
+void ChromiumCDMProxy::SetServerCertificate(PromiseId aPromiseId,
+                                            nsTArray<uint8_t>& aCert) {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::SetServerCertificate(this=%p, pid=%" PRIu32
+          ") certLen=%zu",
+          this, aPromiseId, aCert.Length());
+
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    RejectPromiseWithStateError(aPromiseId,
+                                "Null CDM in SetServerCertificate"_ns);
+    return;
+  }
+
+  mGMPThread->Dispatch(NewRunnableMethod<uint32_t, nsTArray<uint8_t>>(
+      "gmp::ChromiumCDMParent::SetServerCertificate", cdm,
+      &gmp::ChromiumCDMParent::SetServerCertificate, aPromiseId,
+      std::move(aCert)));
+}
+
+void ChromiumCDMProxy::UpdateSession(const nsAString& aSessionId,
+                                     PromiseId aPromiseId,
+                                     nsTArray<uint8_t>& aResponse) {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::UpdateSession(this=%p, sid='%s', pid=%" PRIu32
+          ") "
+          "responseLen=%zu",
+          this, NS_ConvertUTF16toUTF8(aSessionId).get(), aPromiseId,
+          aResponse.Length());
+
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    RejectPromiseWithStateError(aPromiseId, "Null CDM in UpdateSession"_ns);
+    return;
+  }
+  mGMPThread->Dispatch(
+      NewRunnableMethod<nsCString, uint32_t, nsTArray<uint8_t>>(
+          "gmp::ChromiumCDMParent::UpdateSession", cdm,
+          &gmp::ChromiumCDMParent::UpdateSession,
+          NS_ConvertUTF16toUTF8(aSessionId), aPromiseId, std::move(aResponse)));
+}
+
+void ChromiumCDMProxy::CloseSession(const nsAString& aSessionId,
+                                    PromiseId aPromiseId) {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::CloseSession(this=%p, sid='%s', pid=%" PRIu32 ")",
+          this, NS_ConvertUTF16toUTF8(aSessionId).get(), aPromiseId);
+
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    RejectPromiseWithStateError(aPromiseId, "Null CDM in CloseSession"_ns);
+    return;
+  }
+  mGMPThread->Dispatch(NewRunnableMethod<nsCString, uint32_t>(
+      "gmp::ChromiumCDMParent::CloseSession", cdm,
+      &gmp::ChromiumCDMParent::CloseSession, NS_ConvertUTF16toUTF8(aSessionId),
+      aPromiseId));
+}
+
+void ChromiumCDMProxy::RemoveSession(const nsAString& aSessionId,
+                                     PromiseId aPromiseId) {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::RemoveSession(this=%p, sid='%s', pid=%" PRIu32 ")",
+          this, NS_ConvertUTF16toUTF8(aSessionId).get(), aPromiseId);
+
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    RejectPromiseWithStateError(aPromiseId, "Null CDM in RemoveSession"_ns);
+    return;
+  }
+  mGMPThread->Dispatch(NewRunnableMethod<nsCString, uint32_t>(
+      "gmp::ChromiumCDMParent::RemoveSession", cdm,
+      &gmp::ChromiumCDMParent::RemoveSession, NS_ConvertUTF16toUTF8(aSessionId),
+      aPromiseId));
+}
+
+void ChromiumCDMProxy::QueryOutputProtectionStatus() {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::QueryOutputProtectionStatus(this=%p)", this);
+
+  if (mKeys.IsNull()) {
+    EME_LOG(
+        "ChromiumCDMProxy::QueryOutputProtectionStatus(this=%p), mKeys "
+        "missing!",
+        this);
+    // If we can't get mKeys, we're probably in shutdown. But do our best to
+    // respond to the request and indicate the check failed.
+    NotifyOutputProtectionStatus(OutputProtectionCheckStatus::CheckFailed,
+                                 OutputProtectionCaptureStatus::Unused);
+    return;
+  }
+  // The keys will call back via `NotifyOutputProtectionStatus` to notify the
+  // result of the check.
+  mKeys->CheckIsElementCapturePossible();
+}
+
+void ChromiumCDMProxy::NotifyOutputProtectionStatus(
+    OutputProtectionCheckStatus aCheckStatus,
+    OutputProtectionCaptureStatus aCaptureStatus) {
+  MOZ_ASSERT(NS_IsMainThread());
+  // If the check failed aCaptureStatus should be unused, otherwise not.
+  MOZ_ASSERT_IF(aCheckStatus == OutputProtectionCheckStatus::CheckFailed,
+                aCaptureStatus == OutputProtectionCaptureStatus::Unused);
+  MOZ_ASSERT_IF(aCheckStatus == OutputProtectionCheckStatus::CheckSuccessful,
+                aCaptureStatus != OutputProtectionCaptureStatus::Unused);
+  EME_LOG(
+      "ChromiumCDMProxy::NotifyOutputProtectionStatus(this=%p) "
+      "aCheckStatus=%" PRIu8 " aCaptureStatus=%" PRIu8,
+      this, static_cast<uint8_t>(aCheckStatus),
+      static_cast<uint8_t>(aCaptureStatus));
+
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    // If we're in shutdown the CDM may have been cleared while a notification
+    // is in flight. If this happens outside of shutdown we have a bug.
+    MOZ_ASSERT(mIsShutdown);
+    return;
+  }
+
+  uint32_t linkMask{};
+  uint32_t protectionMask{};  // Unused/always zeroed.
+  if (aCheckStatus == OutputProtectionCheckStatus::CheckSuccessful &&
+      aCaptureStatus == OutputProtectionCaptureStatus::CapturePossilbe) {
+    // The result indicates the capture is possible, so set the mask
+    // to indicate this.
+    linkMask |= cdm::OutputLinkTypes::kLinkTypeNetwork;
+  }
+  mGMPThread->Dispatch(NewRunnableMethod<bool, uint32_t, uint32_t>(
+      "gmp::ChromiumCDMParent::NotifyOutputProtectionStatus", cdm,
+      &gmp::ChromiumCDMParent::NotifyOutputProtectionStatus,
+      aCheckStatus == OutputProtectionCheckStatus::CheckSuccessful, linkMask,
+      protectionMask));
+}
+
+void ChromiumCDMProxy::Shutdown() {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::Shutdown(this=%p) mCDM=%p, mIsShutdown=%s", this,
+          mCDM.get(), mIsShutdown ? "true" : "false");
+  if (mIsShutdown) {
+    return;
+  }
+  mIsShutdown = true;
+  mKeys.Clear();
+  ShutdownCDMIfExists();
+}
+
+void ChromiumCDMProxy::RejectPromise(PromiseId aId, ErrorResult&& aException,
+                                     const nsCString& aReason) {
+  if (!NS_IsMainThread()) {
+    // Use CopyableErrorResult to store our exception in the runnable,
+    // because ErrorResult is not OK to move across threads.
+    mMainThread->Dispatch(
+        NewRunnableMethod<PromiseId, StoreCopyPassByRRef<CopyableErrorResult>,
+                          nsCString>(
+            "ChromiumCDMProxy::RejectPromise", this,
+            &ChromiumCDMProxy::RejectPromiseOnMainThread, aId,
+            std::move(aException), aReason),
+        NS_DISPATCH_NORMAL);
+    return;
+  }
+  EME_LOG("ChromiumCDMProxy::RejectPromise(this=%p, pid=%" PRIu32
+          ", code=0x%x, "
+          "reason='%s')",
+          this, aId, aException.ErrorCodeAsInt(), aReason.get());
+  if (!mKeys.IsNull()) {
+    mKeys->RejectPromise(aId, std::move(aException), aReason);
+  } else {
+    // We don't have a MediaKeys object to pass the exception to, so silence
+    // the exception to avoid it asserting due to being unused.
+    aException.SuppressException();
+  }
+}
+
+void ChromiumCDMProxy::RejectPromiseWithStateError(PromiseId aId,
+                                                   const nsCString& aReason) {
+  ErrorResult rv;
+  rv.ThrowInvalidStateError(aReason);
+  RejectPromise(aId, std::move(rv), aReason);
+}
+
+void ChromiumCDMProxy::RejectPromiseOnMainThread(
+    PromiseId aId, CopyableErrorResult&& aException, const nsCString& aReason) {
+  // Moving into or out of a non-copyable ErrorResult will assert that both
+  // ErorResults are from our current thread.  Avoid the assertion by moving
+  // into a current-thread CopyableErrorResult first.  Note that this is safe,
+  // because CopyableErrorResult never holds state that can't move across
+  // threads.
+  CopyableErrorResult rv(std::move(aException));
+  RejectPromise(aId, std::move(rv), aReason);
+}
+
+void ChromiumCDMProxy::ResolvePromise(PromiseId aId) {
+  if (!NS_IsMainThread()) {
+    mMainThread->Dispatch(
+        NewRunnableMethod<PromiseId>("ChromiumCDMProxy::ResolvePromise", this,
+                                     &ChromiumCDMProxy::ResolvePromise, aId),
+        NS_DISPATCH_NORMAL);
+    return;
+  }
+
+  EME_LOG("ChromiumCDMProxy::ResolvePromise(this=%p, pid=%" PRIu32 ")", this,
+          aId);
+  if (!mKeys.IsNull()) {
+    mKeys->ResolvePromise(aId);
+  } else {
+    NS_WARNING("ChromiumCDMProxy unable to resolve promise!");
+  }
+}
+
+const nsCString& ChromiumCDMProxy::GetNodeId() const { return mNodeId; }
+
+void ChromiumCDMProxy::OnSetSessionId(uint32_t aCreateSessionToken,
+                                      const nsAString& aSessionId) {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::OnSetSessionId(this=%p, token=%" PRIu32
+          ", sid='%s')",
+          this, aCreateSessionToken, NS_ConvertUTF16toUTF8(aSessionId).get());
+
+  if (mKeys.IsNull()) {
+    return;
+  }
+  RefPtr<dom::MediaKeySession> session(
+      mKeys->GetPendingSession(aCreateSessionToken));
+  if (session) {
+    session->SetSessionId(aSessionId);
+  }
+}
+
+void ChromiumCDMProxy::OnResolveLoadSessionPromise(uint32_t aPromiseId,
+                                                   bool aSuccess) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mKeys.IsNull()) {
+    return;
+  }
+  mKeys->OnSessionLoaded(aPromiseId, aSuccess);
+}
+
+void ChromiumCDMProxy::OnResolvePromiseWithKeyStatus(
+    uint32_t aPromiseId, dom::MediaKeyStatus aKeyStatus) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mKeys.IsNull()) {
+    return;
+  }
+  mKeys->ResolvePromiseWithKeyStatus(aPromiseId, aKeyStatus);
+}
+
+void ChromiumCDMProxy::OnSessionMessage(const nsAString& aSessionId,
+                                        dom::MediaKeyMessageType aMessageType,
+                                        const nsTArray<uint8_t>& aMessage) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mKeys.IsNull()) {
+    return;
+  }
+  RefPtr<dom::MediaKeySession> session(mKeys->GetSession(aSessionId));
+  if (session) {
+    session->DispatchKeyMessage(aMessageType, aMessage);
+  }
+}
+
+void ChromiumCDMProxy::OnKeyStatusesChange(const nsAString& aSessionId) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mKeys.IsNull()) {
+    return;
+  }
+  RefPtr<dom::MediaKeySession> session(mKeys->GetSession(aSessionId));
+  if (session) {
+    session->DispatchKeyStatusesChange();
+  }
+}
+
+void ChromiumCDMProxy::OnExpirationChange(const nsAString& aSessionId,
+                                          UnixTime aExpiryTime) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mKeys.IsNull()) {
+    return;
+  }
+  RefPtr<dom::MediaKeySession> session(mKeys->GetSession(aSessionId));
+  if (session) {
+    // Expiry of 0 is interpreted as "never expire". See bug 1345341.
+    double t = (aExpiryTime == 0) ? std::numeric_limits<double>::quiet_NaN()
+                                  : static_cast<double>(aExpiryTime);
+    session->SetExpiration(t);
+  }
+}
+
+void ChromiumCDMProxy::OnSessionClosed(const nsAString& aSessionId) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  bool keyStatusesChange = false;
+  {
+    auto caps = Capabilites().Lock();
+    keyStatusesChange = caps->RemoveKeysForSession(nsString(aSessionId));
+  }
+  if (keyStatusesChange) {
+    OnKeyStatusesChange(aSessionId);
+  }
+  if (mKeys.IsNull()) {
+    return;
+  }
+  RefPtr<dom::MediaKeySession> session(mKeys->GetSession(aSessionId));
+  if (session) {
+    session->OnClosed();
+  }
+}
+
+void ChromiumCDMProxy::OnDecrypted(uint32_t aId, DecryptStatus aResult,
+                                   const nsTArray<uint8_t>& aDecryptedData) {}
+
+void ChromiumCDMProxy::OnSessionError(const nsAString& aSessionId,
+                                      nsresult aException, uint32_t aSystemCode,
+                                      const nsAString& aMsg) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mKeys.IsNull()) {
+    return;
+  }
+  RefPtr<dom::MediaKeySession> session(mKeys->GetSession(aSessionId));
+  if (session) {
+    session->DispatchKeyError(aSystemCode);
+  }
+  LogToConsole(aMsg);
+}
+
+void ChromiumCDMProxy::OnRejectPromise(uint32_t aPromiseId,
+                                       ErrorResult&& aException,
+                                       const nsCString& aMsg) {
+  MOZ_ASSERT(NS_IsMainThread());
+  RejectPromise(aPromiseId, std::move(aException), aMsg);
+}
+
+const nsString& ChromiumCDMProxy::KeySystem() const { return mKeySystem; }
+
+DataMutex<CDMCaps>& ChromiumCDMProxy::Capabilites() { return mCapabilites; }
+
+RefPtr<DecryptPromise> ChromiumCDMProxy::Decrypt(MediaRawData* aSample) {
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    return DecryptPromise::CreateAndReject(
+        DecryptResult(eme::AbortedErr, aSample), __func__);
+  }
+  RefPtr<MediaRawData> sample = aSample;
+  return InvokeAsync(mGMPThread, __func__,
+                     [cdm, sample]() { return cdm->Decrypt(sample); });
+}
+
+void ChromiumCDMProxy::GetStatusForPolicy(PromiseId aPromiseId,
+                                          const nsAString& aMinHdcpVersion) {
+  MOZ_ASSERT(NS_IsMainThread());
+  EME_LOG("ChromiumCDMProxy::GetStatusForPolicy(this=%p, pid=%" PRIu32
+          ") minHdcpVersion=%s",
+          this, aPromiseId, NS_ConvertUTF16toUTF8(aMinHdcpVersion).get());
+
+  RefPtr<gmp::ChromiumCDMParent> cdm = GetCDMParent();
+  if (!cdm) {
+    RejectPromiseWithStateError(aPromiseId,
+                                "Null CDM in GetStatusForPolicy"_ns);
+    return;
+  }
+
+  mGMPThread->Dispatch(NewRunnableMethod<uint32_t, nsCString>(
+      "gmp::ChromiumCDMParent::GetStatusForPolicy", cdm,
+      &gmp::ChromiumCDMParent::GetStatusForPolicy, aPromiseId,
+      NS_ConvertUTF16toUTF8(aMinHdcpVersion)));
+}
+
+void ChromiumCDMProxy::Terminated() {
+  if (!mKeys.IsNull()) {
+    mKeys->Terminated();
+  }
+}
+
+already_AddRefed<gmp::ChromiumCDMParent> ChromiumCDMProxy::GetCDMParent() {
+  MutexAutoLock lock(mCDMMutex);
+  RefPtr<gmp::ChromiumCDMParent> cdm = mCDM;
+  return cdm.forget();
+}
+
+}  // namespace mozilla
+
+#undef NS_DispatchToMainThread
diff --git a/dom/media/gmp/ChromiumCDMProxy.h b/dom/media/gmp/ChromiumCDMProxy.h
new file mode 100644
index 0000000000..0f5c3f817f
--- /dev/null
+++ b/dom/media/gmp/ChromiumCDMProxy.h
@@ -0,0 +1,142 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ChromiumCDMProxy_h_
+#define ChromiumCDMProxy_h_
+
+#include "mozilla/AbstractThread.h"
+#include "mozilla/CDMProxy.h"
+#include "ChromiumCDMParent.h"
+
+namespace mozilla {
+
+class ErrorResult;
+class MediaRawData;
+class DecryptJob;
+class ChromiumCDMCallbackProxy;
+class ChromiumCDMProxy : public CDMProxy {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ChromiumCDMProxy, override)
+
+  ChromiumCDMProxy(dom::MediaKeys* aKeys, const nsAString& aKeySystem,
+                   GMPCrashHelper* aCrashHelper,
+                   bool aAllowDistinctiveIdentifier,
+                   bool aAllowPersistentState);
+
+  void Init(PromiseId aPromiseId, const nsAString& aOrigin,
+            const nsAString& aTopLevelOrigin,
+            const nsAString& aGMPName) override;
+
+  void CreateSession(uint32_t aCreateSessionToken,
+                     dom::MediaKeySessionType aSessionType,
+                     PromiseId aPromiseId, const nsAString& aInitDataType,
+                     nsTArray<uint8_t>& aInitData) override;
+
+  void LoadSession(PromiseId aPromiseId, dom::MediaKeySessionType aSessionType,
+                   const nsAString& aSessionId) override;
+
+  void SetServerCertificate(PromiseId aPromiseId,
+                            nsTArray<uint8_t>& aCert) override;
+
+  void UpdateSession(const nsAString& aSessionId, PromiseId aPromiseId,
+                     nsTArray<uint8_t>& aResponse) override;
+
+  void CloseSession(const nsAString& aSessionId, PromiseId aPromiseId) override;
+
+  void RemoveSession(const nsAString& aSessionId,
+                     PromiseId aPromiseId) override;
+
+  void QueryOutputProtectionStatus() override;
+
+  void NotifyOutputProtectionStatus(
+      OutputProtectionCheckStatus aCheckStatus,
+      OutputProtectionCaptureStatus aCaptureStatus) override;
+
+  void Shutdown() override;
+
+  void Terminated() override;
+
+  const nsCString& GetNodeId() const override;
+
+  void OnSetSessionId(uint32_t aCreateSessionToken,
+                      const nsAString& aSessionId) override;
+
+  void OnResolveLoadSessionPromise(uint32_t aPromiseId, bool aSuccess) override;
+
+  void OnSessionMessage(const nsAString& aSessionId,
+                        dom::MediaKeyMessageType aMessageType,
+                        const nsTArray<uint8_t>& aMessage) override;
+
+  void OnExpirationChange(const nsAString& aSessionId,
+                          UnixTime aExpiryTime) override;
+
+  void OnSessionClosed(const nsAString& aSessionId) override;
+
+  void OnSessionError(const nsAString& aSessionId, nsresult aException,
+                      uint32_t aSystemCode, const nsAString& aMsg) override;
+
+  void OnRejectPromise(uint32_t aPromiseId, ErrorResult&& aException,
+                       const nsCString& aMsg) override;
+
+  RefPtr<DecryptPromise> Decrypt(MediaRawData* aSample) override;
+
+  void OnDecrypted(uint32_t aId, DecryptStatus aResult,
+                   const nsTArray<uint8_t>& aDecryptedData) override;
+
+  void RejectPromise(PromiseId aId, ErrorResult&& aException,
+                     const nsCString& aReason) override;
+  // Reject promise with an InvalidStateError and the given message.
+  void RejectPromiseWithStateError(PromiseId aId, const nsCString& aReason);
+  // For use for moving rejections from off-main thread.
+  void RejectPromiseOnMainThread(PromiseId aId,
+                                 CopyableErrorResult&& aException,
+                                 const nsCString& aReason);
+
+  void ResolvePromise(PromiseId aId) override;
+
+  const nsString& KeySystem() const override;
+
+  DataMutex<CDMCaps>& Capabilites() override;
+
+  void OnKeyStatusesChange(const nsAString& aSessionId) override;
+
+  void GetStatusForPolicy(PromiseId aPromiseId,
+                          const nsAString& aMinHdcpVersion) override;
+
+#ifdef DEBUG
+  bool IsOnOwnerThread() override;
+#endif
+
+  ChromiumCDMProxy* AsChromiumCDMProxy() override { return this; }
+
+  // Threadsafe. Note this may return a reference to a shutdown
+  // CDM, which will fail on all operations.
+  already_AddRefed<gmp::ChromiumCDMParent> GetCDMParent();
+
+  void OnResolvePromiseWithKeyStatus(uint32_t aPromiseId,
+                                     dom::MediaKeyStatus aKeyStatus);
+
+ private:
+  void OnCDMCreated(uint32_t aPromiseId);
+  void ShutdownCDMIfExists();
+
+  ~ChromiumCDMProxy();
+
+  // True if Shutdown() has been called. Should only be read and written on
+  // main thread.
+  bool mIsShutdown = false;
+
+  RefPtr<GMPCrashHelper> mCrashHelper;
+
+  Mutex mCDMMutex MOZ_UNANNOTATED;
+  RefPtr<gmp::ChromiumCDMParent> mCDM;
+  nsCOMPtr<nsISerialEventTarget> mGMPThread;
+  UniquePtr<ChromiumCDMCallbackProxy> mCallback;
+};
+
+}  // namespace mozilla
+
+#endif  // ChromiumCDMProxy_h_
diff --git a/dom/media/gmp/DecryptJob.cpp b/dom/media/gmp/DecryptJob.cpp
new file mode 100644
index 0000000000..affda3668f
--- /dev/null
+++ b/dom/media/gmp/DecryptJob.cpp
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "DecryptJob.h"
+#include "mozilla/Atomics.h"
+
+namespace mozilla {
+
+static Atomic<uint32_t> sDecryptJobInstanceCount(0u);
+
+DecryptJob::DecryptJob(MediaRawData* aSample)
+    : mId(++sDecryptJobInstanceCount), mSample(aSample) {}
+
+RefPtr<DecryptPromise> DecryptJob::Ensure() {
+  return mPromise.Ensure(__func__);
+}
+
+void DecryptJob::PostResult(DecryptStatus aResult) {
+  nsTArray<uint8_t> empty;
+  PostResult(aResult, empty);
+}
+
+void DecryptJob::PostResult(DecryptStatus aResult,
+                            Span<const uint8_t> aDecryptedData) {
+  if (aDecryptedData.Length() != mSample->Size()) {
+    NS_WARNING("CDM returned incorrect number of decrypted bytes");
+  }
+  if (aResult == eme::Ok) {
+    UniquePtr<MediaRawDataWriter> writer(mSample->CreateWriter());
+    PodCopy(writer->Data(), aDecryptedData.Elements(),
+            std::min<size_t>(aDecryptedData.Length(), mSample->Size()));
+  } else if (aResult == eme::NoKeyErr) {
+    NS_WARNING("CDM returned NoKeyErr");
+    // We still have the encrypted sample, so we can re-enqueue it to be
+    // decrypted again once the key is usable again.
+  } else {
+    nsAutoCString str("CDM returned decode failure DecryptStatus=");
+    str.AppendInt(aResult);
+    NS_WARNING(str.get());
+  }
+  mPromise.Resolve(DecryptResult(aResult, mSample), __func__);
+}
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/DecryptJob.h b/dom/media/gmp/DecryptJob.h
new file mode 100644
index 0000000000..c4f25206e3
--- /dev/null
+++ b/dom/media/gmp/DecryptJob.h
@@ -0,0 +1,36 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DecryptJob_h_
+#define DecryptJob_h_
+
+#include "mozilla/CDMProxy.h"
+#include "mozilla/Span.h"
+
+namespace mozilla {
+
+class DecryptJob {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DecryptJob)
+
+  explicit DecryptJob(MediaRawData* aSample);
+
+  void PostResult(DecryptStatus aResult, Span<const uint8_t> aDecryptedData);
+  void PostResult(DecryptStatus aResult);
+
+  RefPtr<DecryptPromise> Ensure();
+
+  const uint32_t mId;
+  RefPtr<MediaRawData> mSample;
+
+ private:
+  ~DecryptJob() = default;
+  MozPromiseHolder<DecryptPromise> mPromise;
+};
+
+}  // namespace mozilla
+
+#endif  // DecryptJob_h_
diff --git a/dom/media/gmp/GMPCallbackBase.h b/dom/media/gmp/GMPCallbackBase.h
new file mode 100644
index 0000000000..3f8961c69c
--- /dev/null
+++ b/dom/media/gmp/GMPCallbackBase.h
@@ -0,0 +1,20 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPCallbackBase_h_
+#define GMPCallbackBase_h_
+
+class GMPCallbackBase {
+ public:
+  virtual ~GMPCallbackBase() = default;
+
+  // The GMP code will call this if the codec crashes or shuts down.  It's
+  // expected that the consumer (destination of this callback) will respond
+  // by dropping their reference to the proxy, allowing the proxy/parent to
+  // be destroyed.
+  virtual void Terminated() = 0;
+};
+
+#endif
diff --git a/dom/media/gmp/GMPChild.cpp b/dom/media/gmp/GMPChild.cpp
new file mode 100644
index 0000000000..47f98ae7c1
--- /dev/null
+++ b/dom/media/gmp/GMPChild.cpp
@@ -0,0 +1,726 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPChild.h"
+
+#include "base/command_line.h"
+#include "base/task.h"
+#include "ChildProfilerController.h"
+#include "ChromiumCDMAdapter.h"
+#ifdef XP_LINUX
+#  include "dlfcn.h"
+#endif
+#include "gmp-video-decode.h"
+#include "gmp-video-encode.h"
+#include "GMPContentChild.h"
+#include "GMPLoader.h"
+#include "GMPLog.h"
+#include "GMPPlatform.h"
+#include "GMPProcessChild.h"
+#include "GMPProcessParent.h"
+#include "GMPUtils.h"
+#include "GMPVideoDecoderChild.h"
+#include "GMPVideoEncoderChild.h"
+#include "GMPVideoHost.h"
+#include "mozilla/Algorithm.h"
+#include "mozilla/FOGIPC.h"
+#include "mozilla/glean/GleanMetrics.h"
+#include "mozilla/ipc/CrashReporterClient.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/ipc/ProcessChild.h"
+#include "mozilla/TextUtils.h"
+#include "nsDebugImpl.h"
+#include "nsExceptionHandler.h"
+#include "nsIFile.h"
+#include "nsReadableUtils.h"
+#include "nsThreadManager.h"
+#include "nsXULAppAPI.h"
+#include "nsIXULRuntime.h"
+#include "prio.h"
+#ifdef XP_WIN
+#  include <stdlib.h>  // for _exit()
+#  include "WinUtils.h"
+#else
+#  include <unistd.h>  // for _exit()
+#endif
+
+using namespace mozilla::ipc;
+
+namespace mozilla {
+
+#define GMP_CHILD_LOG_DEBUG(x, ...)                                   \
+  GMP_LOG_DEBUG("GMPChild[pid=%d] " x, (int)base::GetCurrentProcId(), \
+                ##__VA_ARGS__)
+
+namespace gmp {
+
+GMPChild::GMPChild()
+    : mGMPMessageLoop(MessageLoop::current()), mGMPLoader(nullptr) {
+  GMP_CHILD_LOG_DEBUG("GMPChild ctor");
+  nsDebugImpl::SetMultiprocessMode("GMP");
+}
+
+GMPChild::~GMPChild() {
+  GMP_CHILD_LOG_DEBUG("GMPChild dtor");
+#ifdef XP_LINUX
+  for (auto& libHandle : mLibHandles) {
+    dlclose(libHandle);
+  }
+#endif
+}
+
+static bool GetFileBase(const nsAString& aPluginPath,
+                        nsCOMPtr<nsIFile>& aLibDirectory,
+                        nsCOMPtr<nsIFile>& aFileBase, nsAutoString& aBaseName) {
+  nsresult rv = NS_NewLocalFile(aPluginPath, true, getter_AddRefs(aFileBase));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  if (NS_WARN_IF(NS_FAILED(aFileBase->Clone(getter_AddRefs(aLibDirectory))))) {
+    return false;
+  }
+
+  nsCOMPtr<nsIFile> parent;
+  rv = aFileBase->GetParent(getter_AddRefs(parent));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  nsAutoString parentLeafName;
+  rv = parent->GetLeafName(parentLeafName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  aBaseName = Substring(parentLeafName, 4, parentLeafName.Length() - 1);
+  return true;
+}
+
+static bool GetPluginFile(const nsAString& aPluginPath,
+                          nsCOMPtr<nsIFile>& aLibDirectory,
+                          nsCOMPtr<nsIFile>& aLibFile) {
+  nsAutoString baseName;
+  GetFileBase(aPluginPath, aLibDirectory, aLibFile, baseName);
+
+#if defined(XP_MACOSX)
+  nsAutoString binaryName = u"lib"_ns + baseName + u".dylib"_ns;
+#elif defined(OS_POSIX)
+  nsAutoString binaryName = u"lib"_ns + baseName + u".so"_ns;
+#elif defined(XP_WIN)
+  nsAutoString binaryName = baseName + u".dll"_ns;
+#else
+#  error not defined
+#endif
+  aLibFile->AppendRelativePath(binaryName);
+  return true;
+}
+
+static bool GetPluginFile(const nsAString& aPluginPath,
+                          nsCOMPtr<nsIFile>& aLibFile) {
+  nsCOMPtr<nsIFile> unusedlibDir;
+  return GetPluginFile(aPluginPath, unusedlibDir, aLibFile);
+}
+
+#if defined(XP_MACOSX)
+static nsCString GetNativeTarget(nsIFile* aFile) {
+  bool isLink;
+  nsCString path;
+  aFile->IsSymlink(&isLink);
+  if (isLink) {
+    aFile->GetNativeTarget(path);
+  } else {
+    aFile->GetNativePath(path);
+  }
+  return path;
+}
+
+#  if defined(MOZ_SANDBOX)
+static bool GetPluginPaths(const nsAString& aPluginPath,
+                           nsCString& aPluginDirectoryPath,
+                           nsCString& aPluginFilePath) {
+  nsCOMPtr<nsIFile> libDirectory, libFile;
+  if (!GetPluginFile(aPluginPath, libDirectory, libFile)) {
+    return false;
+  }
+
+  // Mac sandbox rules expect paths to actual files and directories -- not
+  // soft links.
+  libDirectory->Normalize();
+  aPluginDirectoryPath = GetNativeTarget(libDirectory);
+
+  libFile->Normalize();
+  aPluginFilePath = GetNativeTarget(libFile);
+
+  return true;
+}
+#  endif  // MOZ_SANDBOX
+#endif    // XP_MACOSX
+
+bool GMPChild::Init(const nsAString& aPluginPath,
+                    mozilla::ipc::UntypedEndpoint&& aEndpoint) {
+  GMP_CHILD_LOG_DEBUG("%s pluginPath=%s", __FUNCTION__,
+                      NS_ConvertUTF16toUTF8(aPluginPath).get());
+
+  // GMPChild needs nsThreadManager to create the ProfilerChild thread.
+  // It is also used on debug builds for the sandbox tests.
+  if (NS_WARN_IF(NS_FAILED(nsThreadManager::get().Init()))) {
+    return false;
+  }
+
+  if (NS_WARN_IF(!aEndpoint.Bind(this))) {
+    return false;
+  }
+
+  CrashReporterClient::InitSingleton(this);
+
+  mPluginPath = aPluginPath;
+
+  return true;
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvProvideStorageId(
+    const nsCString& aStorageId) {
+  GMP_CHILD_LOG_DEBUG("%s", __FUNCTION__);
+  mStorageId = aStorageId;
+  return IPC_OK();
+}
+
+GMPErr GMPChild::GetAPI(const char* aAPIName, void* aHostAPI, void** aPluginAPI,
+                        const nsACString& aKeySystem) {
+  if (!mGMPLoader) {
+    return GMPGenericErr;
+  }
+  return mGMPLoader->GetAPI(aAPIName, aHostAPI, aPluginAPI, aKeySystem);
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvPreloadLibs(const nsCString& aLibs) {
+  // Pre-load libraries that may need to be used by the EME plugin but that
+  // can't be loaded after the sandbox has started.
+#ifdef XP_WIN
+  // Items in this must be lowercase!
+  constexpr static const char16_t* whitelist[] = {
+      u"dxva2.dll",        // Get monitor information
+      u"evr.dll",          // MFGetStrideForBitmapInfoHeader
+      u"freebl3.dll",      // NSS for clearkey CDM
+      u"mfplat.dll",       // MFCreateSample, MFCreateAlignedMemoryBuffer,
+                           // MFCreateMediaType
+      u"msmpeg2vdec.dll",  // H.264 decoder
+      u"nss3.dll",         // NSS for clearkey CDM
+      u"ole32.dll",        // required for OPM
+      u"oleaut32.dll",     // For _bstr_t use in libwebrtc, see bug 1788592
+      u"psapi.dll",        // For GetMappedFileNameW, see bug 1383611
+      u"softokn3.dll",     // NSS for clearkey CDM
+      u"winmm.dll",        // Dependency for widevine
+  };
+  constexpr static bool (*IsASCII)(const char16_t*) =
+      IsAsciiNullTerminated<char16_t>;
+  static_assert(AllOf(std::begin(whitelist), std::end(whitelist), IsASCII),
+                "Items in the whitelist must not contain non-ASCII "
+                "characters!");
+
+  nsTArray<nsCString> libs;
+  SplitAt(", ", aLibs, libs);
+  for (nsCString lib : libs) {
+    ToLowerCase(lib);
+    for (const char16_t* whiteListedLib : whitelist) {
+      if (nsDependentString(whiteListedLib)
+              .EqualsASCII(lib.Data(), lib.Length())) {
+        LoadLibraryW(char16ptr_t(whiteListedLib));
+        break;
+      }
+    }
+  }
+#elif defined(XP_LINUX)
+  constexpr static const char* whitelist[] = {
+      // NSS libraries used by clearkey.
+      "libfreeblpriv3.so",
+      "libsoftokn3.so",
+      // glibc libraries merged into libc.so.6; see bug 1725828 and
+      // the corresponding code in GMPParent.cpp.
+      "libdl.so.2",
+      "libpthread.so.0",
+      "librt.so.1",
+  };
+
+  nsTArray<nsCString> libs;
+  SplitAt(", ", aLibs, libs);
+  for (const nsCString& lib : libs) {
+    for (const char* whiteListedLib : whitelist) {
+      if (lib.EqualsASCII(whiteListedLib)) {
+        auto libHandle = dlopen(whiteListedLib, RTLD_NOW | RTLD_GLOBAL);
+        if (libHandle) {
+          mLibHandles.AppendElement(libHandle);
+        } else {
+          // TODO(bug 1698718): remove the logging once we've identified
+          // the cause of the load failure.
+          const char* error = dlerror();
+          if (error) {
+            // We should always have an error, but gracefully handle just in
+            // case.
+            nsAutoCString nsError{error};
+            CrashReporter::AppendAppNotesToCrashReport(nsError);
+          }
+          // End bug 1698718 logging.
+
+          MOZ_CRASH("Couldn't load lib needed by media plugin");
+        }
+      }
+    }
+  }
+#endif
+  return IPC_OK();
+}
+
+static bool ResolveLinks(nsCOMPtr<nsIFile>& aPath) {
+#if defined(XP_WIN)
+  return widget::WinUtils::ResolveJunctionPointsAndSymLinks(aPath);
+#elif defined(XP_MACOSX)
+  nsCString targetPath = GetNativeTarget(aPath);
+  nsCOMPtr<nsIFile> newFile;
+  if (NS_WARN_IF(NS_FAILED(
+          NS_NewNativeLocalFile(targetPath, true, getter_AddRefs(newFile))))) {
+    return false;
+  }
+  aPath = newFile;
+  return true;
+#else
+  return true;
+#endif
+}
+
+bool GMPChild::GetUTF8LibPath(nsACString& aOutLibPath) {
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+  nsAutoCString pluginDirectoryPath, pluginFilePath;
+  if (!GetPluginPaths(mPluginPath, pluginDirectoryPath, pluginFilePath)) {
+    MOZ_CRASH("Error scanning plugin path");
+  }
+  aOutLibPath.Assign(pluginFilePath);
+  return true;
+#else
+  nsCOMPtr<nsIFile> libFile;
+  if (!GetPluginFile(mPluginPath, libFile)) {
+    return false;
+  }
+
+  if (!FileExists(libFile)) {
+    NS_WARNING("Can't find GMP library file!");
+    return false;
+  }
+
+  nsAutoString path;
+  libFile->GetPath(path);
+  CopyUTF16toUTF8(path, aOutLibPath);
+
+  return true;
+#endif
+}
+
+static nsCOMPtr<nsIFile> AppendFile(nsCOMPtr<nsIFile>&& aFile,
+                                    const nsString& aStr) {
+  return (aFile && NS_SUCCEEDED(aFile->Append(aStr))) ? aFile : nullptr;
+}
+
+static nsCOMPtr<nsIFile> CloneFile(const nsCOMPtr<nsIFile>& aFile) {
+  nsCOMPtr<nsIFile> clone;
+  return (aFile && NS_SUCCEEDED(aFile->Clone(getter_AddRefs(clone)))) ? clone
+                                                                      : nullptr;
+}
+
+static nsCOMPtr<nsIFile> GetParentFile(const nsCOMPtr<nsIFile>& aFile) {
+  nsCOMPtr<nsIFile> parent;
+  return (aFile && NS_SUCCEEDED(aFile->GetParent(getter_AddRefs(parent))))
+             ? parent
+             : nullptr;
+}
+
+#if defined(XP_WIN)
+static bool IsFileLeafEqualToASCII(const nsCOMPtr<nsIFile>& aFile,
+                                   const char* aStr) {
+  nsAutoString leafName;
+  return aFile && NS_SUCCEEDED(aFile->GetLeafName(leafName)) &&
+         leafName.EqualsASCII(aStr);
+}
+#endif
+
+#if defined(XP_WIN)
+#  define FIREFOX_FILE u"firefox.exe"_ns
+#  define XUL_LIB_FILE u"xul.dll"_ns
+#elif defined(XP_MACOSX)
+#  define FIREFOX_FILE u"firefox"_ns
+#  define XUL_LIB_FILE u"XUL"_ns
+#else
+#  define FIREFOX_FILE u"firefox"_ns
+#  define XUL_LIB_FILE u"libxul.so"_ns
+#endif
+
+static nsCOMPtr<nsIFile> GetFirefoxAppPath(
+    nsCOMPtr<nsIFile> aPluginContainerPath) {
+  MOZ_ASSERT(aPluginContainerPath);
+#if defined(XP_MACOSX)
+  // On MacOS the firefox binary is a few parent directories up from
+  // plugin-container.
+  // aPluginContainerPath will end with something like:
+  // xxxx/NightlyDebug.app/Contents/MacOS/plugin-container.app/Contents/MacOS/plugin-container
+  nsCOMPtr<nsIFile> path = aPluginContainerPath;
+  for (int i = 0; i < 4; i++) {
+    path = GetParentFile(path);
+  }
+  return path;
+#else
+  nsCOMPtr<nsIFile> parent = GetParentFile(aPluginContainerPath);
+#  if XP_WIN
+  if (IsFileLeafEqualToASCII(parent, "i686")) {
+    // We must be on Windows on ARM64, where the plugin-container path will
+    // be in the 'i686' subdir. The firefox.exe is in the parent directory.
+    parent = GetParentFile(parent);
+  }
+#  endif
+  return parent;
+#endif
+}
+
+#if defined(XP_MACOSX)
+static bool GetSigPath(const int aRelativeLayers,
+                       const nsString& aTargetSigFileName,
+                       nsCOMPtr<nsIFile> aExecutablePath,
+                       nsCOMPtr<nsIFile>& aOutSigPath) {
+  // The sig file will be located in
+  // xxxx/NightlyDebug.app/Contents/Resources/XUL.sig
+  // xxxx/NightlyDebug.app/Contents/Resources/firefox.sig
+  // xxxx/NightlyDebug.app/Contents/MacOS/plugin-container.app/Contents/Resources/plugin-container.sig
+  // On MacOS the sig file is a few parent directories up from
+  // its executable file.
+  // Start to search the path from the path of the executable file we provided.
+  MOZ_ASSERT(aExecutablePath);
+  nsCOMPtr<nsIFile> path = aExecutablePath;
+  for (int i = 0; i < aRelativeLayers; i++) {
+    nsCOMPtr<nsIFile> parent;
+    if (NS_WARN_IF(NS_FAILED(path->GetParent(getter_AddRefs(parent))))) {
+      return false;
+    }
+    path = parent;
+  }
+  MOZ_ASSERT(path);
+  aOutSigPath = path;
+  return NS_SUCCEEDED(path->Append(u"Resources"_ns)) &&
+         NS_SUCCEEDED(path->Append(aTargetSigFileName));
+}
+#endif
+
+static bool AppendHostPath(nsCOMPtr<nsIFile>& aFile,
+                           nsTArray<std::pair<nsCString, nsCString>>& aPaths) {
+  nsString str;
+  if (!FileExists(aFile) || !ResolveLinks(aFile) ||
+      NS_FAILED(aFile->GetPath(str))) {
+    return false;
+  }
+
+  nsCString filePath = NS_ConvertUTF16toUTF8(str);
+  nsCString sigFilePath;
+#if defined(XP_MACOSX)
+  nsAutoString binary;
+  if (NS_FAILED(aFile->GetLeafName(binary))) {
+    return false;
+  }
+  binary.Append(u".sig"_ns);
+  nsCOMPtr<nsIFile> sigFile;
+  if (GetSigPath(2, binary, aFile, sigFile) &&
+      NS_SUCCEEDED(sigFile->GetPath(str))) {
+    CopyUTF16toUTF8(str, sigFilePath);
+  } else {
+    // Cannot successfully get the sig file path.
+    // Assume it is located at the same place as plugin-container
+    // alternatively.
+    sigFilePath = nsCString(NS_ConvertUTF16toUTF8(str) + ".sig"_ns);
+  }
+#else
+  sigFilePath = nsCString(NS_ConvertUTF16toUTF8(str) + ".sig"_ns);
+#endif
+  aPaths.AppendElement(
+      std::make_pair(std::move(filePath), std::move(sigFilePath)));
+  return true;
+}
+
+nsTArray<std::pair<nsCString, nsCString>>
+GMPChild::MakeCDMHostVerificationPaths() {
+  // Record the file path and its sig file path.
+  nsTArray<std::pair<nsCString, nsCString>> paths;
+  // Plugin binary path.
+  nsCOMPtr<nsIFile> path;
+  nsString str;
+  if (GetPluginFile(mPluginPath, path) && FileExists(path) &&
+      ResolveLinks(path) && NS_SUCCEEDED(path->GetPath(str))) {
+    paths.AppendElement(
+        std::make_pair(nsCString(NS_ConvertUTF16toUTF8(str)),
+                       nsCString(NS_ConvertUTF16toUTF8(str) + ".sig"_ns)));
+  }
+
+  // Plugin-container binary path.
+  // Note: clang won't let us initialize an nsString from a wstring, so we
+  // need to go through UTF8 to get to an nsString.
+  const std::string pluginContainer =
+      WideToUTF8(CommandLine::ForCurrentProcess()->program());
+  path = nullptr;
+  CopyUTF8toUTF16(nsDependentCString(pluginContainer.c_str()), str);
+  if (NS_FAILED(NS_NewLocalFile(str, true, /* aFollowLinks */
+                                getter_AddRefs(path))) ||
+      !AppendHostPath(path, paths)) {
+    // Without successfully determining plugin-container's path, we can't
+    // determine libxul's or Firefox's. So give up.
+    return paths;
+  }
+
+#if defined(XP_WIN)
+  // On Windows on ARM64, we should also append the x86 plugin-container's
+  // xul.dll.
+  const bool isWindowsOnARM64 =
+      IsFileLeafEqualToASCII(GetParentFile(path), "i686");
+  if (isWindowsOnARM64) {
+    nsCOMPtr<nsIFile> x86XulPath =
+        AppendFile(GetParentFile(path), XUL_LIB_FILE);
+    if (!AppendHostPath(x86XulPath, paths)) {
+      return paths;
+    }
+  }
+#endif
+
+  // Firefox application binary path.
+  nsCOMPtr<nsIFile> appDir = GetFirefoxAppPath(path);
+  path = AppendFile(CloneFile(appDir), FIREFOX_FILE);
+  if (!AppendHostPath(path, paths)) {
+    return paths;
+  }
+
+  // Libxul path. Note: re-using 'appDir' var here, as we assume libxul is in
+  // the same directory as Firefox executable.
+  appDir->GetPath(str);
+  path = AppendFile(CloneFile(appDir), XUL_LIB_FILE);
+  if (!AppendHostPath(path, paths)) {
+    return paths;
+  }
+
+  return paths;
+}
+
+static auto ToCString(const nsTArray<std::pair<nsCString, nsCString>>& aPairs) {
+  return StringJoin(","_ns, aPairs, [](nsACString& dest, const auto& p) {
+    dest.AppendPrintf("(%s,%s)", p.first.get(), p.second.get());
+  });
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvStartPlugin(const nsString& aAdapter) {
+  GMP_CHILD_LOG_DEBUG("%s", __FUNCTION__);
+
+  nsCString libPath;
+  if (!GetUTF8LibPath(libPath)) {
+    CrashReporter::AnnotateCrashReport(
+        CrashReporter::Annotation::GMPLibraryPath,
+        NS_ConvertUTF16toUTF8(mPluginPath));
+
+#ifdef XP_WIN
+    return IPC_FAIL(this,
+                    nsPrintfCString("Failed to get lib path with error(%lu).",
+                                    GetLastError())
+                        .get());
+#else
+    return IPC_FAIL(this, "Failed to get lib path.");
+#endif
+  }
+
+  auto platformAPI = new GMPPlatformAPI();
+  InitPlatformAPI(*platformAPI, this);
+
+  mGMPLoader = MakeUnique<GMPLoader>();
+#if defined(MOZ_SANDBOX) && !defined(XP_MACOSX)
+  if (!mGMPLoader->CanSandbox()) {
+    GMP_CHILD_LOG_DEBUG("%s Can't sandbox GMP, failing", __FUNCTION__);
+    delete platformAPI;
+    return IPC_FAIL(this, "Can't sandbox GMP.");
+  }
+#endif
+
+  GMPAdapter* adapter = nullptr;
+  if (aAdapter.EqualsLiteral("chromium")) {
+    auto&& paths = MakeCDMHostVerificationPaths();
+    GMP_CHILD_LOG_DEBUG("%s CDM host paths=%s", __func__,
+                        ToCString(paths).get());
+    adapter = new ChromiumCDMAdapter(std::move(paths));
+  }
+
+  if (!mGMPLoader->Load(libPath.get(), libPath.Length(), platformAPI,
+                        adapter)) {
+    NS_WARNING("Failed to load GMP");
+    delete platformAPI;
+    CrashReporter::AnnotateCrashReport(
+        CrashReporter::Annotation::GMPLibraryPath,
+        NS_ConvertUTF16toUTF8(mPluginPath));
+
+#ifdef XP_WIN
+    return IPC_FAIL(this, nsPrintfCString("Failed to load GMP with error(%lu).",
+                                          GetLastError())
+                              .get());
+#else
+    return IPC_FAIL(this, "Failed to load GMP.");
+#endif
+  }
+
+  return IPC_OK();
+}
+
+MessageLoop* GMPChild::GMPMessageLoop() { return mGMPMessageLoop; }
+
+void GMPChild::ActorDestroy(ActorDestroyReason aWhy) {
+  GMP_CHILD_LOG_DEBUG("%s reason=%d", __FUNCTION__, aWhy);
+
+  for (uint32_t i = mGMPContentChildren.Length(); i > 0; i--) {
+    MOZ_ASSERT_IF(aWhy == NormalShutdown,
+                  !mGMPContentChildren[i - 1]->IsUsed());
+    mGMPContentChildren[i - 1]->Close();
+  }
+
+  if (mGMPLoader) {
+    mGMPLoader->Shutdown();
+  }
+  if (AbnormalShutdown == aWhy) {
+    NS_WARNING("Abnormal shutdown of GMP process!");
+    ProcessChild::QuickExit();
+  }
+
+  // Send the last bits of Glean data over to the main process.
+  glean::FlushFOGData(
+      [](ByteBuf&& aBuf) { glean::SendFOGData(std::move(aBuf)); });
+
+  if (mProfilerController) {
+    mProfilerController->Shutdown();
+    mProfilerController = nullptr;
+  }
+
+  CrashReporterClient::DestroySingleton();
+
+  XRE_ShutdownChildProcess();
+}
+
+void GMPChild::ProcessingError(Result aCode, const char* aReason) {
+  switch (aCode) {
+    case MsgDropped:
+      _exit(0);  // Don't trigger a crash report.
+    case MsgNotKnown:
+      MOZ_CRASH("aborting because of MsgNotKnown");
+    case MsgNotAllowed:
+      MOZ_CRASH("aborting because of MsgNotAllowed");
+    case MsgPayloadError:
+      MOZ_CRASH("aborting because of MsgPayloadError");
+    case MsgProcessingError:
+      MOZ_CRASH("aborting because of MsgProcessingError");
+    case MsgRouteError:
+      MOZ_CRASH("aborting because of MsgRouteError");
+    case MsgValueError:
+      MOZ_CRASH("aborting because of MsgValueError");
+    default:
+      MOZ_CRASH("not reached");
+  }
+}
+
+PGMPTimerChild* GMPChild::AllocPGMPTimerChild() {
+  return new GMPTimerChild(this);
+}
+
+bool GMPChild::DeallocPGMPTimerChild(PGMPTimerChild* aActor) {
+  MOZ_ASSERT(mTimerChild == static_cast<GMPTimerChild*>(aActor));
+  mTimerChild = nullptr;
+  return true;
+}
+
+GMPTimerChild* GMPChild::GetGMPTimers() {
+  if (!mTimerChild) {
+    PGMPTimerChild* sc = SendPGMPTimerConstructor();
+    if (!sc) {
+      return nullptr;
+    }
+    mTimerChild = static_cast<GMPTimerChild*>(sc);
+  }
+  return mTimerChild;
+}
+
+PGMPStorageChild* GMPChild::AllocPGMPStorageChild() {
+  return new GMPStorageChild(this);
+}
+
+bool GMPChild::DeallocPGMPStorageChild(PGMPStorageChild* aActor) {
+  mStorage = nullptr;
+  return true;
+}
+
+GMPStorageChild* GMPChild::GetGMPStorage() {
+  if (!mStorage) {
+    PGMPStorageChild* sc = SendPGMPStorageConstructor();
+    if (!sc) {
+      return nullptr;
+    }
+    mStorage = static_cast<GMPStorageChild*>(sc);
+  }
+  return mStorage;
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvCrashPluginNow() {
+  MOZ_CRASH();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvCloseActive() {
+  for (uint32_t i = mGMPContentChildren.Length(); i > 0; i--) {
+    mGMPContentChildren[i - 1]->CloseActive();
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvInitGMPContentChild(
+    Endpoint<PGMPContentChild>&& aEndpoint) {
+  GMPContentChild* child =
+      mGMPContentChildren.AppendElement(new GMPContentChild(this))->get();
+  aEndpoint.Bind(child);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvFlushFOGData(
+    FlushFOGDataResolver&& aResolver) {
+  GMP_CHILD_LOG_DEBUG("GMPChild RecvFlushFOGData");
+  glean::FlushFOGData(std::move(aResolver));
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvTestTriggerMetrics(
+    TestTriggerMetricsResolver&& aResolve) {
+  GMP_CHILD_LOG_DEBUG("GMPChild RecvTestTriggerMetrics");
+  mozilla::glean::test_only_ipc::a_counter.Add(
+      nsIXULRuntime::PROCESS_TYPE_GMPLUGIN);
+  aResolve(true);
+  return IPC_OK();
+}
+
+void GMPChild::GMPContentChildActorDestroy(GMPContentChild* aGMPContentChild) {
+  for (uint32_t i = mGMPContentChildren.Length(); i > 0; i--) {
+    RefPtr<GMPContentChild>& destroyedActor = mGMPContentChildren[i - 1];
+    if (destroyedActor.get() == aGMPContentChild) {
+      SendPGMPContentChildDestroyed();
+      mGMPContentChildren.RemoveElementAt(i - 1);
+      break;
+    }
+  }
+}
+
+mozilla::ipc::IPCResult GMPChild::RecvInitProfiler(
+    Endpoint<PProfilerChild>&& aEndpoint) {
+  mProfilerController =
+      mozilla::ChildProfilerController::Create(std::move(aEndpoint));
+  return IPC_OK();
+}
+
+}  // namespace gmp
+}  // namespace mozilla
+
+#undef GMP_CHILD_LOG_DEBUG
+#undef __CLASS__
diff --git a/dom/media/gmp/GMPChild.h b/dom/media/gmp/GMPChild.h
new file mode 100644
index 0000000000..21eb74e571
--- /dev/null
+++ b/dom/media/gmp/GMPChild.h
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPChild_h_
+#define GMPChild_h_
+
+#include "mozilla/gmp/PGMPChild.h"
+#include "GMPTimerChild.h"
+#include "GMPStorageChild.h"
+#include "GMPLoader.h"
+#include "gmp-entrypoints.h"
+#include "prlink.h"
+
+namespace mozilla {
+
+class ChildProfilerController;
+
+namespace gmp {
+
+class GMPContentChild;
+
+class GMPChild : public PGMPChild {
+  friend class PGMPChild;
+
+ public:
+  GMPChild();
+  virtual ~GMPChild();
+
+  bool Init(const nsAString& aPluginPath,
+            mozilla::ipc::UntypedEndpoint&& aEndpoint);
+  MessageLoop* GMPMessageLoop();
+
+  // Main thread only.
+  GMPTimerChild* GetGMPTimers();
+  GMPStorageChild* GetGMPStorage();
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+  bool SetMacSandboxInfo(bool aAllowWindowServer);
+#endif
+
+ private:
+  friend class GMPContentChild;
+
+  bool GetUTF8LibPath(nsACString& aOutLibPath);
+
+  mozilla::ipc::IPCResult RecvProvideStorageId(const nsCString& aStorageId);
+
+  mozilla::ipc::IPCResult RecvStartPlugin(const nsString& aAdapter);
+  mozilla::ipc::IPCResult RecvPreloadLibs(const nsCString& aLibs);
+
+  PGMPTimerChild* AllocPGMPTimerChild();
+  bool DeallocPGMPTimerChild(PGMPTimerChild* aActor);
+
+  PGMPStorageChild* AllocPGMPStorageChild();
+  bool DeallocPGMPStorageChild(PGMPStorageChild* aActor);
+
+  void GMPContentChildActorDestroy(GMPContentChild* aGMPContentChild);
+
+  mozilla::ipc::IPCResult RecvCrashPluginNow();
+  mozilla::ipc::IPCResult RecvCloseActive();
+
+  mozilla::ipc::IPCResult RecvInitGMPContentChild(
+      Endpoint<PGMPContentChild>&& aEndpoint);
+
+  mozilla::ipc::IPCResult RecvFlushFOGData(FlushFOGDataResolver&& aResolver);
+
+  mozilla::ipc::IPCResult RecvTestTriggerMetrics(
+      TestTriggerMetricsResolver&& aResolve);
+
+  mozilla::ipc::IPCResult RecvInitProfiler(
+      Endpoint<mozilla::PProfilerChild>&& aEndpoint);
+
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+  void ProcessingError(Result aCode, const char* aReason) override;
+
+  GMPErr GetAPI(const char* aAPIName, void* aHostAPI, void** aPluginAPI,
+                const nsACString& aKeySystem = ""_ns);
+
+  nsTArray<std::pair<nsCString, nsCString>> MakeCDMHostVerificationPaths();
+
+  nsTArray<RefPtr<GMPContentChild>> mGMPContentChildren;
+
+  RefPtr<GMPTimerChild> mTimerChild;
+  RefPtr<GMPStorageChild> mStorage;
+
+  RefPtr<ChildProfilerController> mProfilerController;
+
+  MessageLoop* mGMPMessageLoop;
+  nsString mPluginPath;
+  nsCString mStorageId;
+  UniquePtr<GMPLoader> mGMPLoader;
+#ifdef XP_LINUX
+  nsTArray<void*> mLibHandles;
+#endif
+};
+
+}  // namespace gmp
+}  // namespace mozilla
+
+#endif  // GMPChild_h_
diff --git a/dom/media/gmp/GMPContentChild.cpp b/dom/media/gmp/GMPContentChild.cpp
new file mode 100644
index 0000000000..85fc6e7a70
--- /dev/null
+++ b/dom/media/gmp/GMPContentChild.cpp
@@ -0,0 +1,131 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPContentChild.h"
+#include "GMPChild.h"
+#include "GMPVideoDecoderChild.h"
+#include "GMPVideoEncoderChild.h"
+#include "ChromiumCDMChild.h"
+#include "base/task.h"
+#include "GMPUtils.h"
+
+namespace mozilla::gmp {
+
+MessageLoop* GMPContentChild::GMPMessageLoop() {
+  return mGMPChild->GMPMessageLoop();
+}
+
+void GMPContentChild::CheckThread() {
+  MOZ_ASSERT(mGMPChild->mGMPMessageLoop == MessageLoop::current());
+}
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+mozilla::ipc::IPCResult GMPContentChild::RecvInitSandboxTesting(
+    Endpoint<PSandboxTestingChild>&& aEndpoint) {
+  if (!SandboxTestingChild::Initialize(std::move(aEndpoint))) {
+    return IPC_FAIL(
+        this, "InitSandboxTesting failed to initialise the child process.");
+  }
+  return IPC_OK();
+}
+#endif
+
+void GMPContentChild::ActorDestroy(ActorDestroyReason aWhy) {
+  mGMPChild->GMPContentChildActorDestroy(this);
+}
+
+void GMPContentChild::ProcessingError(Result aCode, const char* aReason) {
+  mGMPChild->ProcessingError(aCode, aReason);
+}
+
+already_AddRefed<PGMPVideoDecoderChild>
+GMPContentChild::AllocPGMPVideoDecoderChild() {
+  return MakeAndAddRef<GMPVideoDecoderChild>(this);
+}
+
+already_AddRefed<PGMPVideoEncoderChild>
+GMPContentChild::AllocPGMPVideoEncoderChild() {
+  return MakeAndAddRef<GMPVideoEncoderChild>(this);
+}
+
+already_AddRefed<PChromiumCDMChild> GMPContentChild::AllocPChromiumCDMChild(
+    const nsACString& aKeySystem) {
+  return MakeAndAddRef<ChromiumCDMChild>(this);
+}
+
+mozilla::ipc::IPCResult GMPContentChild::RecvPGMPVideoDecoderConstructor(
+    PGMPVideoDecoderChild* aActor) {
+  auto vdc = static_cast<GMPVideoDecoderChild*>(aActor);
+
+  void* vd = nullptr;
+  GMPErr err = mGMPChild->GetAPI(GMP_API_VIDEO_DECODER, &vdc->Host(), &vd);
+  if (err != GMPNoErr || !vd) {
+    return IPC_FAIL(this, "GMPGetAPI call failed trying to construct decoder.");
+  }
+
+  vdc->Init(static_cast<GMPVideoDecoder*>(vd));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPContentChild::RecvPGMPVideoEncoderConstructor(
+    PGMPVideoEncoderChild* aActor) {
+  auto vec = static_cast<GMPVideoEncoderChild*>(aActor);
+
+  void* ve = nullptr;
+  GMPErr err = mGMPChild->GetAPI(GMP_API_VIDEO_ENCODER, &vec->Host(), &ve);
+  if (err != GMPNoErr || !ve) {
+    return IPC_FAIL(this, "GMPGetAPI call failed trying to construct encoder.");
+  }
+
+  vec->Init(static_cast<GMPVideoEncoder*>(ve));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPContentChild::RecvPChromiumCDMConstructor(
+    PChromiumCDMChild* aActor, const nsACString& aKeySystem) {
+  ChromiumCDMChild* child = static_cast<ChromiumCDMChild*>(aActor);
+  cdm::Host_10* host10 = child;
+
+  void* cdm = nullptr;
+  GMPErr err = mGMPChild->GetAPI(CHROMIUM_CDM_API, host10, &cdm, aKeySystem);
+  if (err != GMPNoErr || !cdm) {
+    return IPC_FAIL(this, "GMPGetAPI call failed trying to get CDM.");
+  }
+
+  child->Init(static_cast<cdm::ContentDecryptionModule_10*>(cdm),
+              mGMPChild->mStorageId);
+
+  return IPC_OK();
+}
+
+void GMPContentChild::CloseActive() {
+  // Invalidate and remove any remaining API objects.
+  const ManagedContainer<PGMPVideoDecoderChild>& videoDecoders =
+      ManagedPGMPVideoDecoderChild();
+  for (const auto& key : videoDecoders) {
+    key->SendShutdown();
+  }
+
+  const ManagedContainer<PGMPVideoEncoderChild>& videoEncoders =
+      ManagedPGMPVideoEncoderChild();
+  for (const auto& key : videoEncoders) {
+    key->SendShutdown();
+  }
+
+  const ManagedContainer<PChromiumCDMChild>& cdms = ManagedPChromiumCDMChild();
+  for (const auto& key : cdms) {
+    key->SendShutdown();
+  }
+}
+
+bool GMPContentChild::IsUsed() {
+  return !ManagedPGMPVideoDecoderChild().IsEmpty() ||
+         !ManagedPGMPVideoEncoderChild().IsEmpty() ||
+         !ManagedPChromiumCDMChild().IsEmpty();
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPContentChild.h b/dom/media/gmp/GMPContentChild.h
new file mode 100644
index 0000000000..a31b48b00f
--- /dev/null
+++ b/dom/media/gmp/GMPContentChild.h
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPContentChild_h_
+#define GMPContentChild_h_
+
+#include "mozilla/gmp/PGMPContentChild.h"
+#include "GMPSharedMemManager.h"
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+#  include "mozilla/SandboxTestingChild.h"
+#endif
+
+namespace mozilla::gmp {
+
+class GMPChild;
+
+class GMPContentChild : public PGMPContentChild, public GMPSharedMem {
+ public:
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PGMPContentChild.
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPContentChild, final)
+
+  explicit GMPContentChild(GMPChild* aChild) : mGMPChild(aChild) {}
+
+  MessageLoop* GMPMessageLoop();
+
+  mozilla::ipc::IPCResult RecvPGMPVideoDecoderConstructor(
+      PGMPVideoDecoderChild* aActor) override;
+  mozilla::ipc::IPCResult RecvPGMPVideoEncoderConstructor(
+      PGMPVideoEncoderChild* aActor) override;
+  mozilla::ipc::IPCResult RecvPChromiumCDMConstructor(
+      PChromiumCDMChild* aActor, const nsACString& aKeySystem) override;
+
+  already_AddRefed<PGMPVideoDecoderChild> AllocPGMPVideoDecoderChild();
+
+  already_AddRefed<PGMPVideoEncoderChild> AllocPGMPVideoEncoderChild();
+
+  already_AddRefed<PChromiumCDMChild> AllocPChromiumCDMChild(
+      const nsACString& aKeySystem);
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+  mozilla::ipc::IPCResult RecvInitSandboxTesting(
+      Endpoint<PSandboxTestingChild>&& aEndpoint);
+#endif
+
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+  void ProcessingError(Result aCode, const char* aReason) override;
+
+  // GMPSharedMem
+  void CheckThread() override;
+
+  void CloseActive();
+  bool IsUsed();
+
+  GMPChild* mGMPChild;
+
+ private:
+  ~GMPContentChild() = default;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPContentChild_h_
diff --git a/dom/media/gmp/GMPContentParent.cpp b/dom/media/gmp/GMPContentParent.cpp
new file mode 100644
index 0000000000..10fea5c9e3
--- /dev/null
+++ b/dom/media/gmp/GMPContentParent.cpp
@@ -0,0 +1,201 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPContentParent.h"
+#include "GMPLog.h"
+#include "GMPParent.h"
+#include "GMPServiceChild.h"
+#include "GMPVideoDecoderParent.h"
+#include "GMPVideoEncoderParent.h"
+#include "ChromiumCDMParent.h"
+#include "mozIGeckoMediaPluginService.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Unused.h"
+#include "base/task.h"
+
+namespace mozilla::gmp {
+
+static const char* GetBoolString(bool aBool) {
+  return aBool ? "true" : "false";
+}
+
+GMPContentParent::GMPContentParent(GMPParent* aParent)
+    : mParent(aParent), mPluginId(0) {
+  GMP_LOG_DEBUG("GMPContentParent::GMPContentParent(this=%p), aParent=%p", this,
+                aParent);
+  if (mParent) {
+    SetDisplayName(mParent->GetDisplayName());
+    SetPluginId(mParent->GetPluginId());
+  }
+}
+
+GMPContentParent::~GMPContentParent() {
+  GMP_LOG_DEBUG(
+      "GMPContentParent::~GMPContentParent(this=%p) mVideoDecoders.IsEmpty=%s, "
+      "mVideoEncoders.IsEmpty=%s, mChromiumCDMs.IsEmpty=%s, "
+      "mCloseBlockerCount=%" PRIu32,
+      this, GetBoolString(mVideoDecoders.IsEmpty()),
+      GetBoolString(mVideoEncoders.IsEmpty()),
+      GetBoolString(mChromiumCDMs.IsEmpty()), mCloseBlockerCount);
+}
+
+void GMPContentParent::ActorDestroy(ActorDestroyReason aWhy) {
+  GMP_LOG_DEBUG("GMPContentParent::ActorDestroy(this=%p, aWhy=%d)", this,
+                static_cast<int>(aWhy));
+  MOZ_ASSERT(mVideoDecoders.IsEmpty() && mVideoEncoders.IsEmpty() &&
+             mChromiumCDMs.IsEmpty());
+}
+
+void GMPContentParent::CheckThread() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+}
+
+void GMPContentParent::ChromiumCDMDestroyed(ChromiumCDMParent* aCDM) {
+  GMP_LOG_DEBUG("GMPContentParent::ChromiumCDMDestroyed(this=%p, aCDM=%p)",
+                this, aCDM);
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+
+  MOZ_ALWAYS_TRUE(mChromiumCDMs.RemoveElement(aCDM));
+  CloseIfUnused();
+}
+
+void GMPContentParent::VideoDecoderDestroyed(GMPVideoDecoderParent* aDecoder) {
+  GMP_LOG_DEBUG("GMPContentParent::VideoDecoderDestroyed(this=%p, aDecoder=%p)",
+                this, aDecoder);
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+
+  // If the constructor fails, we'll get called before it's added
+  Unused << NS_WARN_IF(!mVideoDecoders.RemoveElement(aDecoder));
+  CloseIfUnused();
+}
+
+void GMPContentParent::VideoEncoderDestroyed(GMPVideoEncoderParent* aEncoder) {
+  GMP_LOG_DEBUG("GMPContentParent::VideoEncoderDestroyed(this=%p, aEncoder=%p)",
+                this, aEncoder);
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+
+  // If the constructor fails, we'll get called before it's added
+  Unused << NS_WARN_IF(!mVideoEncoders.RemoveElement(aEncoder));
+  CloseIfUnused();
+}
+
+void GMPContentParent::AddCloseBlocker() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  ++mCloseBlockerCount;
+  GMP_LOG_DEBUG(
+      "GMPContentParent::AddCloseBlocker(this=%p) mCloseBlockerCount=%" PRIu32,
+      this, mCloseBlockerCount);
+}
+
+void GMPContentParent::RemoveCloseBlocker() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  --mCloseBlockerCount;
+  GMP_LOG_DEBUG(
+      "GMPContentParent::RemoveCloseBlocker(this=%p) "
+      "mCloseBlockerCount=%" PRIu32,
+      this, mCloseBlockerCount);
+  CloseIfUnused();
+}
+
+void GMPContentParent::CloseIfUnused() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMP_LOG_DEBUG(
+      "GMPContentParent::CloseIfUnused(this=%p) mVideoDecoders.IsEmpty=%s, "
+      "mVideoEncoders.IsEmpty=%s, mChromiumCDMs.IsEmpty=%s, "
+      "mCloseBlockerCount=%" PRIu32,
+      this, GetBoolString(mVideoDecoders.IsEmpty()),
+      GetBoolString(mVideoEncoders.IsEmpty()),
+      GetBoolString(mChromiumCDMs.IsEmpty()), mCloseBlockerCount);
+  if (mVideoDecoders.IsEmpty() && mVideoEncoders.IsEmpty() &&
+      mChromiumCDMs.IsEmpty() && mCloseBlockerCount == 0) {
+    RefPtr<GMPContentParent> toClose;
+    if (mParent) {
+      toClose = mParent->ForgetGMPContentParent();
+    } else {
+      toClose = this;
+      RefPtr<GeckoMediaPluginServiceChild> gmp(
+          GeckoMediaPluginServiceChild::GetSingleton());
+      gmp->RemoveGMPContentParent(toClose);
+    }
+    NS_DispatchToCurrentThread(NewRunnableMethod(
+        "gmp::GMPContentParent::Close", toClose, &GMPContentParent::Close));
+  }
+}
+
+nsCOMPtr<nsISerialEventTarget> GMPContentParent::GMPEventTarget() {
+  if (!mGMPEventTarget) {
+    GMP_LOG_DEBUG("GMPContentParent::GMPEventTarget(this=%p)", this);
+    nsCOMPtr<mozIGeckoMediaPluginService> mps =
+        do_GetService("@mozilla.org/gecko-media-plugin-service;1");
+    MOZ_ASSERT(mps);
+    if (!mps) {
+      return nullptr;
+    }
+    // Not really safe if we just grab to the mGMPEventTarget, as we don't know
+    // what thread we're running on and other threads may be trying to
+    // access this without locks!  However, debug only, and primary failure
+    // mode outside of compiler-helped TSAN is a leak.  But better would be
+    // to use swap() under a lock.
+    nsCOMPtr<nsIThread> gmpThread;
+    mps->GetThread(getter_AddRefs(gmpThread));
+    MOZ_ASSERT(gmpThread);
+
+    mGMPEventTarget = gmpThread->SerialEventTarget();
+  }
+
+  return mGMPEventTarget;
+}
+
+already_AddRefed<ChromiumCDMParent> GMPContentParent::GetChromiumCDM(
+    const nsCString& aKeySystem) {
+  GMP_LOG_DEBUG("GMPContentParent::GetChromiumCDM(this=%p aKeySystem=%s)", this,
+                aKeySystem.get());
+
+  RefPtr<ChromiumCDMParent> parent = new ChromiumCDMParent(this, GetPluginId());
+  if (!SendPChromiumCDMConstructor(parent, aKeySystem)) {
+    return nullptr;
+  }
+
+  // TODO: Remove parent from mChromiumCDMs in ChromiumCDMParent::Destroy().
+  mChromiumCDMs.AppendElement(parent);
+
+  return parent.forget();
+}
+
+nsresult GMPContentParent::GetGMPVideoDecoder(GMPVideoDecoderParent** aGMPVD) {
+  GMP_LOG_DEBUG("GMPContentParent::GetGMPVideoDecoder(this=%p)", this);
+
+  RefPtr<GMPVideoDecoderParent> vdp = new GMPVideoDecoderParent(this);
+  if (!SendPGMPVideoDecoderConstructor(vdp)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // This addref corresponds to the Proxy pointer the consumer is returned.
+  // It's dropped by calling Close() on the interface.
+  vdp.get()->AddRef();
+  *aGMPVD = vdp;
+  mVideoDecoders.AppendElement(vdp);
+
+  return NS_OK;
+}
+
+nsresult GMPContentParent::GetGMPVideoEncoder(GMPVideoEncoderParent** aGMPVE) {
+  GMP_LOG_DEBUG("GMPContentParent::GetGMPVideoEncoder(this=%p)", this);
+
+  RefPtr<GMPVideoEncoderParent> vep = new GMPVideoEncoderParent(this);
+  if (!SendPGMPVideoEncoderConstructor(vep)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // This addref corresponds to the Proxy pointer the consumer is returned.
+  // It's dropped by calling Close() on the interface.
+  vep.get()->AddRef();
+  *aGMPVE = vep;
+  mVideoEncoders.AppendElement(vep);
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPContentParent.h b/dom/media/gmp/GMPContentParent.h
new file mode 100644
index 0000000000..d3a275e793
--- /dev/null
+++ b/dom/media/gmp/GMPContentParent.h
@@ -0,0 +1,90 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPContentParent_h_
+#define GMPContentParent_h_
+
+#include "mozilla/gmp/PGMPContentParent.h"
+#include "GMPSharedMemManager.h"
+#include "nsISupportsImpl.h"
+
+namespace mozilla::gmp {
+
+class GMPParent;
+class GMPVideoDecoderParent;
+class GMPVideoEncoderParent;
+class ChromiumCDMParent;
+
+class GMPContentParent final : public PGMPContentParent, public GMPSharedMem {
+  friend class PGMPContentParent;
+
+ public:
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PGMPContentParent.
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPContentParent, final)
+
+  explicit GMPContentParent(GMPParent* aParent = nullptr);
+
+  nsresult GetGMPVideoDecoder(GMPVideoDecoderParent** aGMPVD);
+  void VideoDecoderDestroyed(GMPVideoDecoderParent* aDecoder);
+
+  nsresult GetGMPVideoEncoder(GMPVideoEncoderParent** aGMPVE);
+  void VideoEncoderDestroyed(GMPVideoEncoderParent* aEncoder);
+
+  already_AddRefed<ChromiumCDMParent> GetChromiumCDM(
+      const nsCString& aKeySystem);
+  void ChromiumCDMDestroyed(ChromiumCDMParent* aCDM);
+
+  nsCOMPtr<nsISerialEventTarget> GMPEventTarget();
+
+  // GMPSharedMem
+  void CheckThread() override;
+
+  void SetDisplayName(const nsCString& aDisplayName) {
+    mDisplayName = aDisplayName;
+  }
+  const nsCString& GetDisplayName() { return mDisplayName; }
+  void SetPluginId(const uint32_t aPluginId) { mPluginId = aPluginId; }
+  uint32_t GetPluginId() const { return mPluginId; }
+
+  class CloseBlocker {
+   public:
+    NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CloseBlocker)
+
+    explicit CloseBlocker(GMPContentParent* aParent) : mParent(aParent) {
+      mParent->AddCloseBlocker();
+    }
+    RefPtr<GMPContentParent> mParent;
+
+   private:
+    ~CloseBlocker() { mParent->RemoveCloseBlocker(); }
+  };
+
+ private:
+  void AddCloseBlocker();
+  void RemoveCloseBlocker();
+
+  ~GMPContentParent();
+
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+
+  void CloseIfUnused();
+  // Needed because NewRunnableMethod tried to use the class that the method
+  // lives on to store the receiver, but PGMPContentParent isn't refcounted.
+  void Close() { PGMPContentParent::Close(); }
+
+  nsTArray<RefPtr<GMPVideoDecoderParent>> mVideoDecoders;
+  nsTArray<RefPtr<GMPVideoEncoderParent>> mVideoEncoders;
+  nsTArray<RefPtr<ChromiumCDMParent>> mChromiumCDMs;
+  nsCOMPtr<nsISerialEventTarget> mGMPEventTarget;
+  RefPtr<GMPParent> mParent;
+  nsCString mDisplayName;
+  uint32_t mPluginId;
+  uint32_t mCloseBlockerCount = 0;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPParent_h_
diff --git a/dom/media/gmp/GMPCrashHelper.h b/dom/media/gmp/GMPCrashHelper.h
new file mode 100644
index 0000000000..0034d54ee7
--- /dev/null
+++ b/dom/media/gmp/GMPCrashHelper.h
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if !defined(GMPCrashHelper_h_)
+#  define GMPCrashHelper_h_
+
+#  include "MainThreadUtils.h"
+#  include "nsISupportsImpl.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla {
+
+// For every GMP actor requested, the caller can specify a crash helper,
+// which is an object which supplies the nsPIDOMWindowInner to which we'll
+// dispatch the PluginCrashed event if the GMP crashes.
+// GMPCrashHelper has threadsafe refcounting. Its release method ensures
+// that instances are destroyed on the main thread.
+class GMPCrashHelper {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_DELETE_ON_MAIN_THREAD(
+      GMPCrashHelper);
+
+  // Called on the main thread.
+  virtual already_AddRefed<nsPIDOMWindowInner>
+  GetPluginCrashedEventTarget() = 0;
+
+ protected:
+  virtual ~GMPCrashHelper() { MOZ_ASSERT(NS_IsMainThread()); }
+};
+
+}  // namespace mozilla
+
+#endif  // GMPCrashHelper_h_
diff --git a/dom/media/gmp/GMPCrashHelperHolder.cpp b/dom/media/gmp/GMPCrashHelperHolder.cpp
new file mode 100644
index 0000000000..8184e987a9
--- /dev/null
+++ b/dom/media/gmp/GMPCrashHelperHolder.cpp
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPCrashHelperHolder.h"
+#include "GMPService.h"
+#include "mozilla/RefPtr.h"
+#include "nsPIDOMWindow.h"
+#include "mozilla/ipc/ProtocolUtils.h"
+
+namespace mozilla {
+
+void GMPCrashHelperHolder::SetCrashHelper(GMPCrashHelper* aHelper) {
+  mCrashHelper = aHelper;
+}
+
+GMPCrashHelper* GMPCrashHelperHolder::GetCrashHelper() { return mCrashHelper; }
+
+void GMPCrashHelperHolder::MaybeDisconnect(bool aAbnormalShutdown) {
+  if (!aAbnormalShutdown) {
+    RefPtr<gmp::GeckoMediaPluginService> service(
+        gmp::GeckoMediaPluginService::GetGeckoMediaPluginService());
+    service->DisconnectCrashHelper(GetCrashHelper());
+  }
+}
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/GMPCrashHelperHolder.h b/dom/media/gmp/GMPCrashHelperHolder.h
new file mode 100644
index 0000000000..d8c63234da
--- /dev/null
+++ b/dom/media/gmp/GMPCrashHelperHolder.h
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPCrashHelperHolder_h_
+#define GMPCrashHelperHolder_h_
+
+#include "mozilla/RefPtr.h"
+#include "GMPCrashHelper.h"
+
+namespace mozilla {
+
+// Disconnecting the GMPCrashHelpers at the right time is hard. We need to
+// ensure that in the crashing case that we stay connected until the
+// "gmp-plugin-crashed" message is processed in the content process.
+//
+// We have two channels connecting to the GMP; PGMP which connects from
+// chrome to GMP process, and PGMPContent, which bridges between the content
+// and GMP process. If the GMP crashes both PGMP and PGMPContent receive
+// ActorDestroy messages and begin to shutdown at the same time.
+//
+// However the crash report mini dump must be generated in the chrome
+// process' ActorDestroy, before the "gmp-plugin-crashed" message can be sent
+// to the content process. We fire the "PluginCrashed" event when we handle
+// the "gmp-plugin-crashed" message in the content process, and we need the
+// crash helpers to do that.
+//
+// The PGMPContent's managed actors' ActorDestroy messages are the only shutdown
+// notification we get in the content process, but we can't disconnect the
+// crash handlers there in the crashing case, as ActorDestroy happens before
+// we've received the "gmp-plugin-crashed" message and had a chance for the
+// crash helpers to generate the window to dispatch PluginCrashed to initiate
+// the crash report submission notification box.
+//
+// So we need to ensure that in the content process, the GMPCrashHelpers stay
+// connected to the GMPService until after ActorDestroy messages are received
+// if there's an abnormal shutdown. In the case where the GMP doesn't crash,
+// we do actually want to disconnect GMPCrashHandlers in ActorDestroy, since
+// we don't have any other signal that a GMP actor is shutting down. If we don't
+// disconnect the crash helper there in the normal shutdown case, the helper
+// will stick around forever and leak.
+//
+// In the crashing case, the GMPCrashHelpers are deallocated when the crash
+// report is processed in GeckoMediaPluginService::RunPluginCrashCallbacks().
+//
+// It's a bit yuck that we have to have two paths for disconnecting the crash
+// helpers, but there aren't really any better options.
+class GMPCrashHelperHolder {
+ public:
+  void SetCrashHelper(GMPCrashHelper* aHelper);
+
+  GMPCrashHelper* GetCrashHelper();
+
+  void MaybeDisconnect(bool aAbnormalShutdown);
+
+ private:
+  RefPtr<GMPCrashHelper> mCrashHelper;
+};
+
+}  // namespace mozilla
+
+#endif  // GMPCrashHelperHolder_h_
diff --git a/dom/media/gmp/GMPDiskStorage.cpp b/dom/media/gmp/GMPDiskStorage.cpp
new file mode 100644
index 0000000000..5f7a023b9b
--- /dev/null
+++ b/dom/media/gmp/GMPDiskStorage.cpp
@@ -0,0 +1,454 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "plhash.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "GMPParent.h"
+#include "gmp-storage.h"
+#include "mozilla/Unused.h"
+#include "mozilla/EndianUtils.h"
+#include "nsClassHashtable.h"
+#include "prio.h"
+#include "nsContentCID.h"
+#include "nsServiceManagerUtils.h"
+
+namespace mozilla::gmp {
+
+// We store the records for a given GMP as files in the profile dir.
+// $profileDir/gmp/$platform/$gmpName/storage/$nodeId/
+static nsresult GetGMPStorageDir(nsIFile** aTempDir, const nsAString& aGMPName,
+                                 const nsACString& aNodeId) {
+  if (NS_WARN_IF(!aTempDir)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsCOMPtr<mozIGeckoMediaPluginChromeService> mps =
+      do_GetService("@mozilla.org/gecko-media-plugin-service;1");
+  if (NS_WARN_IF(!mps)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIFile> tmpFile;
+  nsresult rv = mps->GetStorageDir(getter_AddRefs(tmpFile));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = tmpFile->Append(aGMPName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = tmpFile->AppendNative("storage"_ns);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = tmpFile->AppendNative(aNodeId);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = tmpFile->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  if (rv != NS_ERROR_FILE_ALREADY_EXISTS && NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  tmpFile.forget(aTempDir);
+
+  return NS_OK;
+}
+
+// Disk-backed GMP storage. Records are stored in files on disk in
+// the profile directory. The record name is a hash of the filename,
+// and we resolve hash collisions by just adding 1 to the hash code.
+// The format of records on disk is:
+//   4 byte, uint32_t $recordNameLength, in little-endian byte order,
+//   record name (i.e. $recordNameLength bytes, no null terminator)
+//   record bytes (entire remainder of file)
+class GMPDiskStorage : public GMPStorage {
+ public:
+  explicit GMPDiskStorage(const nsACString& aNodeId, const nsAString& aGMPName)
+      : mNodeId(aNodeId), mGMPName(aGMPName) {}
+
+  ~GMPDiskStorage() {
+    // Close all open file handles.
+    for (const auto& record : mRecords.Values()) {
+      if (record->mFileDesc) {
+        PR_Close(record->mFileDesc);
+        record->mFileDesc = nullptr;
+      }
+    }
+  }
+
+  nsresult Init() {
+    // Build our index of records on disk.
+    nsCOMPtr<nsIFile> storageDir;
+    nsresult rv =
+        GetGMPStorageDir(getter_AddRefs(storageDir), mGMPName, mNodeId);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return NS_ERROR_FAILURE;
+    }
+
+    DirectoryEnumerator iter(storageDir, DirectoryEnumerator::FilesAndDirs);
+    for (nsCOMPtr<nsIFile> dirEntry; (dirEntry = iter.Next()) != nullptr;) {
+      PRFileDesc* fd = nullptr;
+      if (NS_WARN_IF(
+              NS_FAILED(dirEntry->OpenNSPRFileDesc(PR_RDONLY, 0, &fd)))) {
+        continue;
+      }
+      int32_t recordLength = 0;
+      nsCString recordName;
+      nsresult err = ReadRecordMetadata(fd, recordLength, recordName);
+      PR_Close(fd);
+      if (NS_WARN_IF(NS_FAILED(err))) {
+        // File is not a valid storage file. Don't index it. Delete the file,
+        // to make our indexing faster in future.
+        dirEntry->Remove(false);
+        continue;
+      }
+
+      nsAutoString filename;
+      rv = dirEntry->GetLeafName(filename);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        continue;
+      }
+
+      mRecords.InsertOrUpdate(recordName,
+                              MakeUnique<Record>(filename, recordName));
+    }
+
+    return NS_OK;
+  }
+
+  GMPErr Open(const nsACString& aRecordName) override {
+    MOZ_ASSERT(!IsOpen(aRecordName));
+
+    Record* const record =
+        mRecords.WithEntryHandle(aRecordName, [&](auto&& entry) -> Record* {
+          if (!entry) {
+            // New file.
+            nsAutoString filename;
+            nsresult rv = GetUnusedFilename(aRecordName, filename);
+            if (NS_WARN_IF(NS_FAILED(rv))) {
+              return nullptr;
+            }
+            return entry.Insert(MakeUnique<Record>(filename, aRecordName))
+                .get();
+          }
+
+          return entry->get();
+        });
+    if (!record) {
+      return GMPGenericErr;
+    }
+
+    MOZ_ASSERT(record);
+    if (record->mFileDesc) {
+      NS_WARNING("Tried to open already open record");
+      return GMPRecordInUse;
+    }
+
+    nsresult rv =
+        OpenStorageFile(record->mFilename, ReadWrite, &record->mFileDesc);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return GMPGenericErr;
+    }
+
+    MOZ_ASSERT(IsOpen(aRecordName));
+
+    return GMPNoErr;
+  }
+
+  bool IsOpen(const nsACString& aRecordName) const override {
+    // We are open if we have a record indexed, and it has a valid
+    // file descriptor.
+    const Record* record = mRecords.Get(aRecordName);
+    return record && !!record->mFileDesc;
+  }
+
+  GMPErr Read(const nsACString& aRecordName,
+              nsTArray<uint8_t>& aOutBytes) override {
+    if (!IsOpen(aRecordName)) {
+      return GMPClosedErr;
+    }
+
+    Record* record = nullptr;
+    mRecords.Get(aRecordName, &record);
+    MOZ_ASSERT(record && !!record->mFileDesc);  // IsOpen() guarantees this.
+
+    // Our error strategy is to report records with invalid contents as
+    // containing 0 bytes. Zero length records are considered "deleted" by
+    // the GMPStorage API.
+    aOutBytes.SetLength(0);
+
+    int32_t recordLength = 0;
+    nsCString recordName;
+    nsresult err =
+        ReadRecordMetadata(record->mFileDesc, recordLength, recordName);
+    if (NS_WARN_IF(NS_FAILED(err) || recordLength == 0)) {
+      // We failed to read the record metadata. Or the record is 0 length.
+      // Treat damaged records as empty.
+      // ReadRecordMetadata() could fail if the GMP opened a new record and
+      // tried to read it before anything was written to it..
+      return GMPNoErr;
+    }
+
+    if (!aRecordName.Equals(recordName)) {
+      NS_WARNING("Record file contains some other record's contents!");
+      return GMPRecordCorrupted;
+    }
+
+    // After calling ReadRecordMetadata, we should be ready to read the
+    // record data.
+    if (PR_Available(record->mFileDesc) != recordLength) {
+      NS_WARNING("Record file length mismatch!");
+      return GMPRecordCorrupted;
+    }
+
+    aOutBytes.SetLength(recordLength);
+    int32_t bytesRead =
+        PR_Read(record->mFileDesc, aOutBytes.Elements(), recordLength);
+    return (bytesRead == recordLength) ? GMPNoErr : GMPRecordCorrupted;
+  }
+
+  GMPErr Write(const nsACString& aRecordName,
+               const nsTArray<uint8_t>& aBytes) override {
+    if (!IsOpen(aRecordName)) {
+      return GMPClosedErr;
+    }
+
+    Record* record = nullptr;
+    mRecords.Get(aRecordName, &record);
+    MOZ_ASSERT(record && !!record->mFileDesc);  // IsOpen() guarantees this.
+
+    // Write operations overwrite the entire record. So close it now.
+    PR_Close(record->mFileDesc);
+    record->mFileDesc = nullptr;
+
+    // Writing 0 bytes means removing (deleting) the file.
+    if (aBytes.Length() == 0) {
+      nsresult rv = RemoveStorageFile(record->mFilename);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        // Could not delete file -> Continue with trying to erase the contents.
+      } else {
+        return GMPNoErr;
+      }
+    }
+
+    // Write operations overwrite the entire record. So re-open the file
+    // in truncate mode, to clear its contents.
+    if (NS_WARN_IF(NS_FAILED(OpenStorageFile(record->mFilename, Truncate,
+                                             &record->mFileDesc)))) {
+      return GMPGenericErr;
+    }
+
+    // Store the length of the record name followed by the record name
+    // at the start of the file.
+    int32_t bytesWritten = 0;
+    char buf[sizeof(uint32_t)] = {0};
+    LittleEndian::writeUint32(buf, aRecordName.Length());
+    bytesWritten = PR_Write(record->mFileDesc, buf, MOZ_ARRAY_LENGTH(buf));
+    if (bytesWritten != MOZ_ARRAY_LENGTH(buf)) {
+      NS_WARNING("Failed to write GMPStorage record name length.");
+      return GMPRecordCorrupted;
+    }
+    bytesWritten = PR_Write(record->mFileDesc, aRecordName.BeginReading(),
+                            aRecordName.Length());
+    if (bytesWritten != (int32_t)aRecordName.Length()) {
+      NS_WARNING("Failed to write GMPStorage record name.");
+      return GMPRecordCorrupted;
+    }
+
+    bytesWritten =
+        PR_Write(record->mFileDesc, aBytes.Elements(), aBytes.Length());
+    if (bytesWritten != (int32_t)aBytes.Length()) {
+      NS_WARNING("Failed to write GMPStorage record data.");
+      return GMPRecordCorrupted;
+    }
+
+    // Try to sync the file to disk, so that in the event of a crash,
+    // the record is less likely to be corrupted.
+    PR_Sync(record->mFileDesc);
+
+    return GMPNoErr;
+  }
+
+  void Close(const nsACString& aRecordName) override {
+    Record* record = nullptr;
+    mRecords.Get(aRecordName, &record);
+    if (record && !!record->mFileDesc) {
+      PR_Close(record->mFileDesc);
+      record->mFileDesc = nullptr;
+    }
+    MOZ_ASSERT(!IsOpen(aRecordName));
+  }
+
+ private:
+  // We store records in a file which is a hash of the record name.
+  // If there is a hash collision, we just keep adding 1 to the hash
+  // code, until we find a free slot.
+  nsresult GetUnusedFilename(const nsACString& aRecordName,
+                             nsString& aOutFilename) {
+    nsCOMPtr<nsIFile> storageDir;
+    nsresult rv =
+        GetGMPStorageDir(getter_AddRefs(storageDir), mGMPName, mNodeId);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    uint64_t recordNameHash = HashString(PromiseFlatCString(aRecordName).get());
+    for (int i = 0; i < 1000000; i++) {
+      nsCOMPtr<nsIFile> f;
+      rv = storageDir->Clone(getter_AddRefs(f));
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      nsAutoString hashStr;
+      hashStr.AppendInt(recordNameHash);
+      rv = f->Append(hashStr);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      bool exists = false;
+      f->Exists(&exists);
+      if (!exists) {
+        // Filename not in use, we can write into this file.
+        aOutFilename = hashStr;
+        return NS_OK;
+      } else {
+        // Hash collision; just increment the hash name and try that again.
+        ++recordNameHash;
+        continue;
+      }
+    }
+    // Somehow, we've managed to completely fail to find a vacant file name.
+    // Give up.
+    NS_WARNING("GetUnusedFilename had extreme hash collision!");
+    return NS_ERROR_FAILURE;
+  }
+
+  enum OpenFileMode { ReadWrite, Truncate };
+
+  nsresult OpenStorageFile(const nsAString& aFileLeafName,
+                           const OpenFileMode aMode, PRFileDesc** aOutFD) {
+    MOZ_ASSERT(aOutFD);
+
+    nsCOMPtr<nsIFile> f;
+    nsresult rv = GetGMPStorageDir(getter_AddRefs(f), mGMPName, mNodeId);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    f->Append(aFileLeafName);
+
+    auto mode = PR_RDWR | PR_CREATE_FILE;
+    if (aMode == Truncate) {
+      mode |= PR_TRUNCATE;
+    }
+
+    return f->OpenNSPRFileDesc(mode, PR_IRWXU, aOutFD);
+  }
+
+  nsresult ReadRecordMetadata(PRFileDesc* aFd, int32_t& aOutRecordLength,
+                              nsACString& aOutRecordName) {
+    int32_t offset = PR_Seek(aFd, 0, PR_SEEK_END);
+    PR_Seek(aFd, 0, PR_SEEK_SET);
+
+    if (offset < 0 || offset > GMP_MAX_RECORD_SIZE) {
+      // Refuse to read big records, or records where we can't get a length.
+      return NS_ERROR_FAILURE;
+    }
+    const uint32_t fileLength = static_cast<uint32_t>(offset);
+
+    // At the start of the file the length of the record name is stored in a
+    // uint32_t (little endian byte order) followed by the record name at the
+    // start of the file. The record name is not null terminated. The remainder
+    // of the file is the record's data.
+
+    if (fileLength < sizeof(uint32_t)) {
+      // Record file doesn't have enough contents to store the record name
+      // length. Fail.
+      return NS_ERROR_FAILURE;
+    }
+
+    // Read length, and convert to host byte order.
+    uint32_t recordNameLength = 0;
+    char buf[sizeof(recordNameLength)] = {0};
+    int32_t bytesRead = PR_Read(aFd, &buf, sizeof(recordNameLength));
+    recordNameLength = LittleEndian::readUint32(buf);
+    if (sizeof(recordNameLength) != bytesRead || recordNameLength == 0 ||
+        recordNameLength + sizeof(recordNameLength) > fileLength ||
+        recordNameLength > GMP_MAX_RECORD_NAME_SIZE) {
+      // Record file has invalid contents. Fail.
+      return NS_ERROR_FAILURE;
+    }
+
+    nsCString recordName;
+    recordName.SetLength(recordNameLength);
+    bytesRead = PR_Read(aFd, recordName.BeginWriting(), recordNameLength);
+    if ((uint32_t)bytesRead != recordNameLength) {
+      // Read failed.
+      return NS_ERROR_FAILURE;
+    }
+
+    MOZ_ASSERT(fileLength >= sizeof(recordNameLength) + recordNameLength);
+    int32_t recordLength =
+        fileLength - (sizeof(recordNameLength) + recordNameLength);
+
+    aOutRecordLength = recordLength;
+    aOutRecordName = recordName;
+
+    // Read cursor should be positioned after the record name, before the record
+    // contents.
+    if (PR_Seek(aFd, 0, PR_SEEK_CUR) !=
+        (int32_t)(sizeof(recordNameLength) + recordNameLength)) {
+      NS_WARNING("Read cursor mismatch after ReadRecordMetadata()");
+      return NS_ERROR_FAILURE;
+    }
+
+    return NS_OK;
+  }
+
+  nsresult RemoveStorageFile(const nsAString& aFilename) {
+    nsCOMPtr<nsIFile> f;
+    nsresult rv = GetGMPStorageDir(getter_AddRefs(f), mGMPName, mNodeId);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    rv = f->Append(aFilename);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    return f->Remove(/* bool recursive= */ false);
+  }
+
+  struct Record {
+    Record(const nsAString& aFilename, const nsACString& aRecordName)
+        : mFilename(aFilename), mRecordName(aRecordName), mFileDesc(0) {}
+    ~Record() { MOZ_ASSERT(!mFileDesc); }
+    nsString mFilename;
+    nsCString mRecordName;
+    PRFileDesc* mFileDesc;
+  };
+
+  // Hash record name to record data.
+  nsClassHashtable<nsCStringHashKey, Record> mRecords;
+  const nsCString mNodeId;
+  const nsString mGMPName;
+};
+
+already_AddRefed<GMPStorage> CreateGMPDiskStorage(const nsACString& aNodeId,
+                                                  const nsAString& aGMPName) {
+  RefPtr<GMPDiskStorage> storage(new GMPDiskStorage(aNodeId, aGMPName));
+  if (NS_FAILED(storage->Init())) {
+    NS_WARNING("Failed to initialize on disk GMP storage");
+    return nullptr;
+  }
+  return storage.forget();
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPLoader.cpp b/dom/media/gmp/GMPLoader.cpp
new file mode 100644
index 0000000000..6eedef903d
--- /dev/null
+++ b/dom/media/gmp/GMPLoader.cpp
@@ -0,0 +1,189 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPLoader.h"
+#include <stdio.h>
+#include "mozilla/Attributes.h"
+#include "gmp-entrypoints.h"
+#include "prlink.h"
+#include "prenv.h"
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+#  include "mozilla/sandboxTarget.h"
+#  include "mozilla/sandboxing/SandboxInitialization.h"
+#  include "mozilla/sandboxing/sandboxLogging.h"
+#endif
+#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+#  include "mozilla/Sandbox.h"
+#  include "mozilla/SandboxInfo.h"
+#endif
+
+#include <string>
+
+#ifdef XP_WIN
+#  include <windows.h>
+#endif
+
+namespace mozilla::gmp {
+class PassThroughGMPAdapter : public GMPAdapter {
+ public:
+  ~PassThroughGMPAdapter() override {
+    // Ensure we're always shutdown, even if caller forgets to call
+    // GMPShutdown().
+    GMPShutdown();
+  }
+
+  void SetAdaptee(PRLibrary* aLib) override { mLib = aLib; }
+
+  GMPErr GMPInit(const GMPPlatformAPI* aPlatformAPI) override {
+    if (!mLib) {
+      return GMPGenericErr;
+    }
+    GMPInitFunc initFunc =
+        reinterpret_cast<GMPInitFunc>(PR_FindFunctionSymbol(mLib, "GMPInit"));
+    if (!initFunc) {
+      return GMPNotImplementedErr;
+    }
+    return initFunc(aPlatformAPI);
+  }
+
+  GMPErr GMPGetAPI(const char* aAPIName, void* aHostAPI, void** aPluginAPI,
+                   const nsACString& /* aKeySystem */) override {
+    if (!mLib) {
+      return GMPGenericErr;
+    }
+    GMPGetAPIFunc getapiFunc = reinterpret_cast<GMPGetAPIFunc>(
+        PR_FindFunctionSymbol(mLib, "GMPGetAPI"));
+    if (!getapiFunc) {
+      return GMPNotImplementedErr;
+    }
+    return getapiFunc(aAPIName, aHostAPI, aPluginAPI);
+  }
+
+  void GMPShutdown() override {
+    if (mLib) {
+      GMPShutdownFunc shutdownFunc = reinterpret_cast<GMPShutdownFunc>(
+          PR_FindFunctionSymbol(mLib, "GMPShutdown"));
+      if (shutdownFunc) {
+        shutdownFunc();
+      }
+      PR_UnloadLibrary(mLib);
+      mLib = nullptr;
+    }
+  }
+
+ private:
+  PRLibrary* mLib = nullptr;
+};
+
+bool GMPLoader::Load(const char* aUTF8LibPath, uint32_t aUTF8LibPathLen,
+                     const GMPPlatformAPI* aPlatformAPI, GMPAdapter* aAdapter) {
+  if (!getenv("MOZ_DISABLE_GMP_SANDBOX") && mSandboxStarter &&
+      !mSandboxStarter->Start(aUTF8LibPath)) {
+    return false;
+  }
+
+  // Load the GMP.
+  PRLibSpec libSpec;
+#ifdef XP_WIN
+  int pathLen = MultiByteToWideChar(CP_UTF8, 0, aUTF8LibPath, -1, nullptr, 0);
+  if (pathLen == 0) {
+    return false;
+  }
+
+  auto widePath = MakeUnique<wchar_t[]>(pathLen);
+  if (MultiByteToWideChar(CP_UTF8, 0, aUTF8LibPath, -1, widePath.get(),
+                          pathLen) == 0) {
+    return false;
+  }
+
+  libSpec.value.pathname_u = widePath.get();
+  libSpec.type = PR_LibSpec_PathnameU;
+#else
+  libSpec.value.pathname = aUTF8LibPath;
+  libSpec.type = PR_LibSpec_Pathname;
+#endif
+  PRLibrary* lib = PR_LoadLibraryWithFlags(libSpec, 0);
+  if (!lib) {
+    return false;
+  }
+
+  mAdapter.reset((!aAdapter) ? new PassThroughGMPAdapter() : aAdapter);
+  mAdapter->SetAdaptee(lib);
+
+  if (mAdapter->GMPInit(aPlatformAPI) != GMPNoErr) {
+    return false;
+  }
+
+  return true;
+}
+
+GMPErr GMPLoader::GetAPI(const char* aAPIName, void* aHostAPI,
+                         void** aPluginAPI, const nsACString& aKeySystem) {
+  return mAdapter->GMPGetAPI(aAPIName, aHostAPI, aPluginAPI, aKeySystem);
+}
+
+void GMPLoader::Shutdown() {
+  if (mAdapter) {
+    mAdapter->GMPShutdown();
+  }
+}
+
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+class WinSandboxStarter : public mozilla::gmp::SandboxStarter {
+ public:
+  bool Start(const char* aLibPath) override {
+    // Cause advapi32 to load before the sandbox is turned on, as
+    // Widevine version 970 and later require it and the sandbox
+    // blocks it on Win7.
+    unsigned int dummy_rand;
+    rand_s(&dummy_rand);
+
+    mozilla::SandboxTarget::Instance()->StartSandbox();
+    return true;
+  }
+};
+#endif
+
+#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+namespace {
+class LinuxSandboxStarter : public mozilla::gmp::SandboxStarter {
+ private:
+  LinuxSandboxStarter() = default;
+  friend mozilla::detail::UniqueSelector<LinuxSandboxStarter>::SingleObject
+  mozilla::MakeUnique<LinuxSandboxStarter>();
+
+ public:
+  static UniquePtr<SandboxStarter> Make() {
+    if (mozilla::SandboxInfo::Get().CanSandboxMedia()) {
+      return MakeUnique<LinuxSandboxStarter>();
+    }
+    // Sandboxing isn't possible, but the parent has already
+    // checked that this plugin doesn't require it.  (Bug 1074561)
+    return nullptr;
+  }
+  bool Start(const char* aLibPath) override {
+    mozilla::SetMediaPluginSandbox(aLibPath);
+    return true;
+  }
+};
+}  // anonymous namespace
+#endif  // XP_LINUX && MOZ_SANDBOX
+
+static UniquePtr<SandboxStarter> MakeSandboxStarter() {
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+  return mozilla::MakeUnique<WinSandboxStarter>();
+#elif defined(XP_LINUX) && defined(MOZ_SANDBOX)
+  return LinuxSandboxStarter::Make();
+#else
+  return nullptr;
+#endif
+}
+
+GMPLoader::GMPLoader() : mSandboxStarter(MakeSandboxStarter()) {}
+
+bool GMPLoader::CanSandbox() const { return !!mSandboxStarter; }
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPLoader.h b/dom/media/gmp/GMPLoader.h
new file mode 100644
index 0000000000..a0e1513d34
--- /dev/null
+++ b/dom/media/gmp/GMPLoader.h
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMP_LOADER_H__
+#define GMP_LOADER_H__
+
+#include <stdint.h>
+#include "prlink.h"
+#include "gmp-entrypoints.h"
+#include "mozilla/UniquePtr.h"
+#include "nsString.h"
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+#  include "mozilla/Sandbox.h"
+#endif
+
+namespace mozilla::gmp {
+
+class SandboxStarter {
+ public:
+  virtual ~SandboxStarter() = default;
+  virtual bool Start(const char* aLibPath) = 0;
+};
+
+// Interface that adapts a plugin to the GMP API.
+class GMPAdapter {
+ public:
+  virtual ~GMPAdapter() = default;
+  // Sets the adapted to plugin library module.
+  // Note: the GMPAdapter is responsible for calling PR_UnloadLibrary on aLib
+  // when it's finished with it.
+  virtual void SetAdaptee(PRLibrary* aLib) = 0;
+
+  // These are called in place of the corresponding GMP API functions.
+  virtual GMPErr GMPInit(const GMPPlatformAPI* aPlatformAPI) = 0;
+  // The `aKeySystem` arg is used to specify the key system when loading CDMs,
+  // and will be ignored by non-CDM GMPs. It is not part of the public GMP API
+  // Gecko exposes.
+  virtual GMPErr GMPGetAPI(const char* aAPIName, void* aHostAPI,
+                           void** aPluginAPI, const nsACString& aKeySystem) = 0;
+  virtual void GMPShutdown() = 0;
+};
+
+// Encapsulates activating the sandbox, and loading the GMP.
+// Load() takes an optional GMPAdapter which can be used to adapt non-GMPs
+// to adhere to the GMP API.
+class GMPLoader {
+ public:
+  GMPLoader();
+
+  // Activates the sandbox, then loads the GMP library. If aAdapter is
+  // non-null, the lib path is assumed to be a non-GMP, and the adapter
+  // is initialized with the lib and the adapter is used to interact with
+  // the plugin.
+  bool Load(const char* aUTF8LibPath, uint32_t aLibPathLen,
+            const GMPPlatformAPI* aPlatformAPI, GMPAdapter* aAdapter = nullptr);
+
+  // Retrieves an interface pointer from the GMP. If the GMP is loading a CDM,
+  // aKeySystem is passed to the CDM to allow for key system specific
+  // configuration by the CDM.
+  GMPErr GetAPI(const char* aAPIName, void* aHostAPI, void** aPluginAPI,
+                const nsACString& aKeySystem);
+
+  // Calls the GMPShutdown function exported by the GMP lib, and unloads the
+  // plugin library.
+  void Shutdown();
+
+  bool CanSandbox() const;
+
+ private:
+  UniquePtr<SandboxStarter> mSandboxStarter;
+  UniquePtr<GMPAdapter> mAdapter;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMP_LOADER_H__
diff --git a/dom/media/gmp/GMPLog.h b/dom/media/gmp/GMPLog.h
new file mode 100644
index 0000000000..6aa1976427
--- /dev/null
+++ b/dom/media/gmp/GMPLog.h
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DOM_MEDIA_GMPLOG_H_
+#define DOM_MEDIA_GMPLOG_H_
+
+#include "content_decryption_module.h"
+#include "mozilla/Logging.h"
+
+namespace mozilla {
+
+extern LogModule* GetGMPLog();
+
+#define GMP_LOG_ERROR(msg, ...) \
+  MOZ_LOG(GetGMPLog(), LogLevel::Error, (msg, ##__VA_ARGS__))
+#define GMP_LOG_WARNING(msg, ...) \
+  MOZ_LOG(GetGMPLog(), LogLevel::Warning, (msg, ##__VA_ARGS__))
+#define GMP_LOG_INFO(msg, ...) \
+  MOZ_LOG(GetGMPLog(), LogLevel::Info, (msg, ##__VA_ARGS__))
+#define GMP_LOG_DEBUG(msg, ...) \
+  MOZ_LOG(GetGMPLog(), LogLevel::Debug, (msg, ##__VA_ARGS__))
+#define GMP_LOG_VERBOSE(msg, ...) \
+  MOZ_LOG(GetGMPLog(), LogLevel::Verbose, (msg, ##__VA_ARGS__))
+
+// Helpers
+
+inline const char* CdmStatusToString(cdm::Status aStatus) {
+  switch (aStatus) {
+    case cdm::Status::kSuccess:
+      return "success";
+    case cdm::Status::kNeedMoreData:
+      return "need more data";
+    case cdm::Status::kNoKey:
+      return "no key";
+    case cdm::Status::kInitializationError:
+      return "initialization error";
+    case cdm::Status::kDecryptError:
+      return "decrypt error";
+    case cdm::Status::kDecodeError:
+      return "decode error";
+    case cdm::Status::kDeferredInitialization:
+      return "deferred initialization";
+    default:
+      MOZ_ASSERT_UNREACHABLE("Should have coverage of entire enum");
+      return "unexpected status code";  // Gracefully handle disabled asserts.
+  }
+}
+
+inline const char* CdmStatusToString(uint32_t aStatus) {
+  return CdmStatusToString(cdm::Status(aStatus));
+}
+
+// End helpers
+
+}  // namespace mozilla
+
+#endif  // DOM_MEDIA_GMPLOG_H_
diff --git a/dom/media/gmp/GMPMemoryStorage.cpp b/dom/media/gmp/GMPMemoryStorage.cpp
new file mode 100644
index 0000000000..fe8cfee5f8
--- /dev/null
+++ b/dom/media/gmp/GMPMemoryStorage.cpp
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPStorage.h"
+#include "nsClassHashtable.h"
+
+namespace mozilla::gmp {
+
+class GMPMemoryStorage : public GMPStorage {
+ public:
+  GMPErr Open(const nsACString& aRecordName) override {
+    MOZ_ASSERT(!IsOpen(aRecordName));
+
+    Record* record = mRecords.GetOrInsertNew(aRecordName);
+    record->mIsOpen = true;
+    return GMPNoErr;
+  }
+
+  bool IsOpen(const nsACString& aRecordName) const override {
+    const Record* record = mRecords.Get(aRecordName);
+    if (!record) {
+      return false;
+    }
+    return record->mIsOpen;
+  }
+
+  GMPErr Read(const nsACString& aRecordName,
+              nsTArray<uint8_t>& aOutBytes) override {
+    const Record* record = mRecords.Get(aRecordName);
+    if (!record) {
+      return GMPGenericErr;
+    }
+    aOutBytes = record->mData.Clone();
+    return GMPNoErr;
+  }
+
+  GMPErr Write(const nsACString& aRecordName,
+               const nsTArray<uint8_t>& aBytes) override {
+    Record* record = nullptr;
+    if (!mRecords.Get(aRecordName, &record)) {
+      return GMPClosedErr;
+    }
+    record->mData = aBytes.Clone();
+    return GMPNoErr;
+  }
+
+  void Close(const nsACString& aRecordName) override {
+    Record* record = nullptr;
+    if (!mRecords.Get(aRecordName, &record)) {
+      return;
+    }
+    if (!record->mData.Length()) {
+      // Record is empty, delete.
+      mRecords.Remove(aRecordName);
+    } else {
+      record->mIsOpen = false;
+    }
+  }
+
+ private:
+  struct Record {
+    nsTArray<uint8_t> mData;
+    bool mIsOpen = false;
+  };
+
+  nsClassHashtable<nsCStringHashKey, Record> mRecords;
+};
+
+already_AddRefed<GMPStorage> CreateGMPMemoryStorage() {
+  return RefPtr<GMPStorage>(new GMPMemoryStorage()).forget();
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPMessageUtils.h b/dom/media/gmp/GMPMessageUtils.h
new file mode 100644
index 0000000000..33a18f7ad8
--- /dev/null
+++ b/dom/media/gmp/GMPMessageUtils.h
@@ -0,0 +1,174 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPMessageUtils_h_
+#define GMPMessageUtils_h_
+
+#include "gmp-video-codec.h"
+#include "gmp-video-frame-encoded.h"
+#include "ipc/EnumSerializer.h"
+#include "ipc/IPCMessageUtilsSpecializations.h"
+#include "GMPSanitizedExports.h"
+
+namespace IPC {
+
+template <>
+struct ParamTraits<GMPErr>
+    : public ContiguousEnumSerializer<GMPErr, GMPNoErr, GMPLastErr> {};
+
+template <>
+struct ParamTraits<GMPVideoFrameType>
+    : public ContiguousEnumSerializer<GMPVideoFrameType, kGMPKeyFrame,
+                                      kGMPVideoFrameInvalid> {};
+
+template <>
+struct ParamTraits<GMPVideoCodecComplexity>
+    : public ContiguousEnumSerializer<GMPVideoCodecComplexity,
+                                      kGMPComplexityNormal,
+                                      kGMPComplexityInvalid> {};
+
+template <>
+struct ParamTraits<GMPVP8ResilienceMode>
+    : public ContiguousEnumSerializer<GMPVP8ResilienceMode, kResilienceOff,
+                                      kResilienceInvalid> {};
+
+template <>
+struct ParamTraits<GMPVideoCodecType>
+    : public ContiguousEnumSerializer<GMPVideoCodecType, kGMPVideoCodecVP8,
+                                      kGMPVideoCodecInvalid> {};
+
+template <>
+struct ParamTraits<GMPVideoCodecMode>
+    : public ContiguousEnumSerializer<GMPVideoCodecMode, kGMPRealtimeVideo,
+                                      kGMPCodecModeInvalid> {};
+
+template <>
+struct ParamTraits<GMPBufferType>
+    : public ContiguousEnumSerializer<GMPBufferType, GMP_BufferSingle,
+                                      GMP_BufferInvalid> {};
+
+template <>
+struct ParamTraits<cdm::EncryptionScheme>
+    : public ContiguousEnumSerializerInclusive<
+          cdm::EncryptionScheme, cdm::EncryptionScheme::kUnencrypted,
+          cdm::EncryptionScheme::kCbcs> {};
+
+template <>
+struct ParamTraits<cdm::HdcpVersion>
+    : public ContiguousEnumSerializerInclusive<
+          cdm::HdcpVersion, cdm::HdcpVersion::kHdcpVersionNone,
+          cdm::HdcpVersion::kHdcpVersion2_2> {};
+
+template <>
+struct ParamTraits<GMPSimulcastStream> {
+  typedef GMPSimulcastStream paramType;
+
+  static void Write(MessageWriter* aWriter, const paramType& aParam) {
+    WriteParam(aWriter, aParam.mWidth);
+    WriteParam(aWriter, aParam.mHeight);
+    WriteParam(aWriter, aParam.mNumberOfTemporalLayers);
+    WriteParam(aWriter, aParam.mMaxBitrate);
+    WriteParam(aWriter, aParam.mTargetBitrate);
+    WriteParam(aWriter, aParam.mMinBitrate);
+    WriteParam(aWriter, aParam.mQPMax);
+  }
+
+  static bool Read(MessageReader* aReader, paramType* aResult) {
+    if (ReadParam(aReader, &(aResult->mWidth)) &&
+        ReadParam(aReader, &(aResult->mHeight)) &&
+        ReadParam(aReader, &(aResult->mNumberOfTemporalLayers)) &&
+        ReadParam(aReader, &(aResult->mMaxBitrate)) &&
+        ReadParam(aReader, &(aResult->mTargetBitrate)) &&
+        ReadParam(aReader, &(aResult->mMinBitrate)) &&
+        ReadParam(aReader, &(aResult->mQPMax))) {
+      return true;
+    }
+    return false;
+  }
+};
+
+template <>
+struct ParamTraits<GMPVideoCodec> {
+  typedef GMPVideoCodec paramType;
+
+  static void Write(MessageWriter* aWriter, const paramType& aParam) {
+    WriteParam(aWriter, aParam.mGMPApiVersion);
+    WriteParam(aWriter, aParam.mCodecType);
+    WriteParam(aWriter, static_cast<const nsCString&>(
+                            nsDependentCString(aParam.mPLName)));
+    WriteParam(aWriter, aParam.mPLType);
+    WriteParam(aWriter, aParam.mWidth);
+    WriteParam(aWriter, aParam.mHeight);
+    WriteParam(aWriter, aParam.mStartBitrate);
+    WriteParam(aWriter, aParam.mMaxBitrate);
+    WriteParam(aWriter, aParam.mMinBitrate);
+    WriteParam(aWriter, aParam.mMaxFramerate);
+    WriteParam(aWriter, aParam.mFrameDroppingOn);
+    WriteParam(aWriter, aParam.mKeyFrameInterval);
+    WriteParam(aWriter, aParam.mQPMax);
+    WriteParam(aWriter, aParam.mNumberOfSimulcastStreams);
+    for (uint32_t i = 0; i < aParam.mNumberOfSimulcastStreams; i++) {
+      WriteParam(aWriter, aParam.mSimulcastStream[i]);
+    }
+    WriteParam(aWriter, aParam.mMode);
+  }
+
+  static bool Read(MessageReader* aReader, paramType* aResult) {
+    // NOTE: make sure this matches any versions supported
+    if (!ReadParam(aReader, &(aResult->mGMPApiVersion)) ||
+        aResult->mGMPApiVersion != kGMPVersion33) {
+      return false;
+    }
+    if (!ReadParam(aReader, &(aResult->mCodecType))) {
+      return false;
+    }
+
+    nsAutoCString plName;
+    if (!ReadParam(aReader, &plName) ||
+        plName.Length() > kGMPPayloadNameSize - 1) {
+      return false;
+    }
+    memcpy(aResult->mPLName, plName.get(), plName.Length());
+    memset(aResult->mPLName + plName.Length(), 0,
+           kGMPPayloadNameSize - plName.Length());
+
+    if (!ReadParam(aReader, &(aResult->mPLType)) ||
+        !ReadParam(aReader, &(aResult->mWidth)) ||
+        !ReadParam(aReader, &(aResult->mHeight)) ||
+        !ReadParam(aReader, &(aResult->mStartBitrate)) ||
+        !ReadParam(aReader, &(aResult->mMaxBitrate)) ||
+        !ReadParam(aReader, &(aResult->mMinBitrate)) ||
+        !ReadParam(aReader, &(aResult->mMaxFramerate)) ||
+        !ReadParam(aReader, &(aResult->mFrameDroppingOn)) ||
+        !ReadParam(aReader, &(aResult->mKeyFrameInterval))) {
+      return false;
+    }
+
+    if (!ReadParam(aReader, &(aResult->mQPMax)) ||
+        !ReadParam(aReader, &(aResult->mNumberOfSimulcastStreams))) {
+      return false;
+    }
+
+    if (aResult->mNumberOfSimulcastStreams > kGMPMaxSimulcastStreams) {
+      return false;
+    }
+
+    for (uint32_t i = 0; i < aResult->mNumberOfSimulcastStreams; i++) {
+      if (!ReadParam(aReader, &(aResult->mSimulcastStream[i]))) {
+        return false;
+      }
+    }
+
+    if (!ReadParam(aReader, &(aResult->mMode))) {
+      return false;
+    }
+
+    return true;
+  }
+};
+
+}  // namespace IPC
+
+#endif  // GMPMessageUtils_h_
diff --git a/dom/media/gmp/GMPParent.cpp b/dom/media/gmp/GMPParent.cpp
new file mode 100644
index 0000000000..c425b07091
--- /dev/null
+++ b/dom/media/gmp/GMPParent.cpp
@@ -0,0 +1,1171 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPParent.h"
+
+#include "CDMStorageIdProvider.h"
+#include "ChromiumCDMAdapter.h"
+#include "GMPContentParent.h"
+#include "GMPLog.h"
+#include "GMPTimerParent.h"
+#include "MediaResult.h"
+#include "mozIGeckoMediaPluginService.h"
+#include "mozilla/dom/KeySystemNames.h"
+#include "mozilla/dom/WidevineCDMManifestBinding.h"
+#include "mozilla/FOGIPC.h"
+#include "mozilla/ipc/CrashReporterHost.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/ipc/GeckoChildProcessHost.h"
+#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+#  include "mozilla/SandboxInfo.h"
+#  include "base/shared_memory.h"
+#endif
+#include "mozilla/Services.h"
+#include "mozilla/SSE.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "mozilla/SyncRunnable.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/Unused.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIRunnable.h"
+#include "nsIObserverService.h"
+#include "nsIWritablePropertyBag2.h"
+#include "nsPrintfCString.h"
+#include "nsThreadUtils.h"
+#include "ProfilerParent.h"
+#include "runnable_utils.h"
+#ifdef XP_WIN
+#  include "WMFDecoderModule.h"
+#endif
+#if defined(MOZ_WIDGET_ANDROID)
+#  include "mozilla/java/GeckoProcessManagerWrappers.h"
+#  include "mozilla/java/GeckoProcessTypeWrappers.h"
+#endif  // defined(MOZ_WIDGET_ANDROID)
+#if defined(XP_MACOSX)
+#  include "nsMacUtilsImpl.h"
+#  include "base/process_util.h"
+#endif  // defined(XP_MACOSX)
+
+using mozilla::ipc::GeckoChildProcessHost;
+
+using CrashReporter::AnnotationTable;
+
+namespace mozilla::gmp {
+
+#define GMP_PARENT_LOG_DEBUG(x, ...) \
+  GMP_LOG_DEBUG("GMPParent[%p|childPid=%d] " x, this, mChildPid, ##__VA_ARGS__)
+
+#ifdef __CLASS__
+#  undef __CLASS__
+#endif
+#define __CLASS__ "GMPParent"
+
+GMPParent::GMPParent()
+    : mState(GMPStateNotLoaded),
+      mPluginId(GeckoChildProcessHost::GetUniqueID()),
+      mProcess(nullptr),
+      mDeleteProcessOnlyOnUnload(false),
+      mAbnormalShutdownInProgress(false),
+      mIsBlockingDeletion(false),
+      mCanDecrypt(false),
+      mGMPContentChildCount(0),
+      mChildPid(0),
+      mHoldingSelfRef(false),
+#if defined(XP_MACOSX) && defined(__aarch64__)
+      mChildLaunchArch(base::PROCESS_ARCH_INVALID),
+#endif
+      mMainThread(GetMainThreadSerialEventTarget()) {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMP_PARENT_LOG_DEBUG("GMPParent ctor id=%u", mPluginId);
+}
+
+GMPParent::~GMPParent() {
+  // This method is not restricted to a specific thread.
+  GMP_PARENT_LOG_DEBUG("GMPParent dtor id=%u", mPluginId);
+  MOZ_ASSERT(!mProcess);
+}
+
+void GMPParent::CloneFrom(const GMPParent* aOther) {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  MOZ_ASSERT(aOther->mDirectory && aOther->mService, "null plugin directory");
+
+  mService = aOther->mService;
+  mDirectory = aOther->mDirectory;
+  mName = aOther->mName;
+  mVersion = aOther->mVersion;
+  mDescription = aOther->mDescription;
+  mDisplayName = aOther->mDisplayName;
+#if defined(XP_WIN) || defined(XP_LINUX)
+  mLibs = aOther->mLibs;
+#endif
+  for (const GMPCapability& cap : aOther->mCapabilities) {
+    mCapabilities.AppendElement(cap);
+  }
+  mAdapter = aOther->mAdapter;
+
+#if defined(XP_MACOSX) && defined(__aarch64__)
+  mChildLaunchArch = aOther->mChildLaunchArch;
+#endif
+}
+
+#if defined(XP_MACOSX)
+nsresult GMPParent::GetPluginFileArch(nsIFile* aPluginDir,
+                                      nsAutoString& aLeafName,
+                                      uint32_t& aArchSet) {
+  // Build up the plugin filename
+  nsAutoString baseName;
+  baseName = Substring(aLeafName, 4, aLeafName.Length() - 1);
+  nsAutoString pluginFileName = u"lib"_ns + baseName + u".dylib"_ns;
+  GMP_PARENT_LOG_DEBUG("%s: pluginFileName: %s", __FUNCTION__,
+                       NS_LossyConvertUTF16toASCII(pluginFileName).get());
+
+  // Create an nsIFile representing the plugin
+  nsCOMPtr<nsIFile> pluginFile;
+  nsresult rv = aPluginDir->Clone(getter_AddRefs(pluginFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+  pluginFile->AppendRelativePath(pluginFileName);
+
+  // Get the full plugin path
+  nsCString pluginPath;
+  rv = pluginFile->GetNativePath(pluginPath);
+  NS_ENSURE_SUCCESS(rv, rv);
+  GMP_PARENT_LOG_DEBUG("%s: pluginPath: %s", __FUNCTION__, pluginPath.get());
+
+  rv = nsMacUtilsImpl::GetArchitecturesForBinary(pluginPath.get(), &aArchSet);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+#  if defined(__aarch64__)
+  mPluginFilePath = pluginPath;
+#  endif
+
+  return NS_OK;
+}
+#endif  // defined(XP_MACOSX)
+
+RefPtr<GenericPromise> GMPParent::Init(GeckoMediaPluginServiceParent* aService,
+                                       nsIFile* aPluginDir) {
+  MOZ_ASSERT(aPluginDir);
+  MOZ_ASSERT(aService);
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+
+  mService = aService;
+  mDirectory = aPluginDir;
+
+  // aPluginDir is <profile-dir>/<gmp-plugin-id>/<version>
+  // where <gmp-plugin-id> should be gmp-gmpopenh264
+  nsCOMPtr<nsIFile> parent;
+  nsresult rv = aPluginDir->GetParent(getter_AddRefs(parent));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+  nsAutoString parentLeafName;
+  rv = parent->GetLeafName(parentLeafName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+  GMP_PARENT_LOG_DEBUG("%s: for %s", __FUNCTION__,
+                       NS_LossyConvertUTF16toASCII(parentLeafName).get());
+
+  MOZ_ASSERT(parentLeafName.Length() > 4);
+  mName = Substring(parentLeafName, 4);
+
+#if defined(XP_MACOSX)
+  uint32_t pluginArch = 0;
+  rv = GetPluginFileArch(aPluginDir, parentLeafName, pluginArch);
+  if (NS_FAILED(rv)) {
+    GMP_PARENT_LOG_DEBUG("%s: Plugin arch error: %d", __FUNCTION__, rv);
+  } else {
+    GMP_PARENT_LOG_DEBUG("%s: Plugin arch: 0x%x", __FUNCTION__, pluginArch);
+  }
+
+  uint32_t x86 = base::PROCESS_ARCH_X86_64 | base::PROCESS_ARCH_I386;
+#  if defined(__aarch64__)
+  uint32_t arm64 = base::PROCESS_ARCH_ARM_64;
+  // When executing in an ARM64 process, if the library is x86 or x64,
+  // set |mChildLaunchArch| to x64 and allow the library to be used as long
+  // as this process is a universal binary.
+  if (!(pluginArch & arm64) && (pluginArch & x86)) {
+    bool isWidevine = parentLeafName.Find(u"widevine") != kNotFound;
+    bool isWidevineAllowed =
+        StaticPrefs::media_gmp_widevinecdm_allow_x64_plugin_on_arm64();
+    bool isH264 = parentLeafName.Find(u"openh264") != kNotFound;
+    bool isH264Allowed =
+        StaticPrefs::media_gmp_gmpopenh264_allow_x64_plugin_on_arm64();
+
+    // Only allow x64 child GMP processes for Widevine and OpenH264
+    if (!isWidevine && !isH264) {
+      return GenericPromise::CreateAndReject(NS_ERROR_NOT_IMPLEMENTED,
+                                             __func__);
+    }
+    // And only if prefs permit it.
+    if ((isWidevine && !isWidevineAllowed) || (isH264 && !isH264Allowed)) {
+      return GenericPromise::CreateAndReject(NS_ERROR_PLUGIN_DISABLED,
+                                             __func__);
+    }
+
+    // We have an x64 library. Get the bundle architecture to determine
+    // if we are a universal binary and hence if we can launch an x64
+    // child process to host this plugin.
+    uint32_t bundleArch = base::PROCESS_ARCH_INVALID;
+    rv = nsMacUtilsImpl::GetArchitecturesForBundle(&bundleArch);
+    if (NS_FAILED(rv)) {
+      // If we fail here, continue as if this is not a univeral binary.
+      GMP_PARENT_LOG_DEBUG("%s: Bundle arch error: %d", __FUNCTION__, rv);
+    } else {
+      GMP_PARENT_LOG_DEBUG("%s: Bundle arch: 0x%x", __FUNCTION__, bundleArch);
+    }
+
+    bool isUniversalBinary = (bundleArch & base::PROCESS_ARCH_X86_64) &&
+                             (bundleArch & base::PROCESS_ARCH_ARM_64);
+    if (isUniversalBinary) {
+      mChildLaunchArch = base::PROCESS_ARCH_X86_64;
+      PreTranslateBins();
+    } else {
+      return GenericPromise::CreateAndReject(NS_ERROR_NOT_IMPLEMENTED,
+                                             __func__);
+    }
+  }
+#  else
+  // When executing in a non-ARM process, if the library is not x86 or x64,
+  // remove it and return an error. This prevents a child process crash due
+  // to loading an incompatible library and forces a new plugin version to be
+  // downloaded when the check is next performed. This could occur if a profile
+  // is moved from an ARM64 system to an x64 system.
+  if ((pluginArch & x86) == 0) {
+    GMP_PARENT_LOG_DEBUG("%s: Removing plugin directory", __FUNCTION__);
+    aPluginDir->Remove(true);
+    return GenericPromise::CreateAndReject(NS_ERROR_NOT_IMPLEMENTED, __func__);
+  }
+#  endif  // defined(__aarch64__)
+#endif    // defined(XP_MACOSX)
+
+  return ReadGMPMetaData();
+}
+
+void GMPParent::Crash() {
+  if (mState != GMPStateNotLoaded) {
+    Unused << SendCrashPluginNow();
+  }
+}
+
+class NotifyGMPProcessLoadedTask : public Runnable {
+ public:
+  explicit NotifyGMPProcessLoadedTask(const ::base::ProcessId aProcessId,
+                                      GMPParent* aGMPParent)
+      : Runnable("NotifyGMPProcessLoadedTask"),
+        mProcessId(aProcessId),
+        mGMPParent(aGMPParent) {}
+
+  NS_IMETHOD Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    bool canProfile = true;
+
+#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+    if (SandboxInfo::Get().Test(SandboxInfo::kEnabledForMedia) &&
+        base::SharedMemory::UsingPosixShm()) {
+      canProfile = false;
+    }
+#endif
+
+    if (canProfile) {
+      nsCOMPtr<nsISerialEventTarget> gmpEventTarget =
+          mGMPParent->GMPEventTarget();
+      if (!gmpEventTarget) {
+        return NS_ERROR_FAILURE;
+      }
+
+      ipc::Endpoint<PProfilerChild> profilerParent(
+          ProfilerParent::CreateForProcess(mProcessId));
+
+      gmpEventTarget->Dispatch(
+          NewRunnableMethod<ipc::Endpoint<mozilla::PProfilerChild>&&>(
+              "GMPParent::SendInitProfiler", mGMPParent,
+              &GMPParent::SendInitProfiler, std::move(profilerParent)));
+    }
+
+    return NS_OK;
+  }
+
+  ::base::ProcessId mProcessId;
+  const RefPtr<GMPParent> mGMPParent;
+};
+
+nsresult GMPParent::LoadProcess() {
+  MOZ_ASSERT(mDirectory, "Plugin directory cannot be NULL!");
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  MOZ_ASSERT(mState == GMPStateNotLoaded);
+
+  nsAutoString path;
+  if (NS_WARN_IF(NS_FAILED(mDirectory->GetPath(path)))) {
+    return NS_ERROR_FAILURE;
+  }
+  GMP_PARENT_LOG_DEBUG("%s: for %s", __FUNCTION__,
+                       NS_ConvertUTF16toUTF8(path).get());
+
+  if (!mProcess) {
+    mProcess = new GMPProcessParent(NS_ConvertUTF16toUTF8(path).get());
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+    mProcess->SetRequiresWindowServer(mAdapter.EqualsLiteral("chromium"));
+#endif
+
+#if defined(XP_MACOSX) && defined(__aarch64__)
+    mProcess->SetLaunchArchitecture(mChildLaunchArch);
+#endif
+
+    if (!mProcess->Launch(30 * 1000)) {
+      GMP_PARENT_LOG_DEBUG("%s: Failed to launch new child process",
+                           __FUNCTION__);
+      mProcess->Delete();
+      mProcess = nullptr;
+      return NS_ERROR_FAILURE;
+    }
+
+    mChildPid = base::GetProcId(mProcess->GetChildProcessHandle());
+    GMP_PARENT_LOG_DEBUG("%s: Launched new child process", __FUNCTION__);
+
+    bool opened = mProcess->TakeInitialEndpoint().Bind(this);
+    if (!opened) {
+      GMP_PARENT_LOG_DEBUG("%s: Failed to open channel to new child process",
+                           __FUNCTION__);
+      mProcess->Delete();
+      mProcess = nullptr;
+      return NS_ERROR_FAILURE;
+    }
+    GMP_PARENT_LOG_DEBUG("%s: Opened channel to new child process",
+                         __FUNCTION__);
+
+    // ComputeStorageId may return empty string, we leave the error handling to
+    // CDM. The CDM will reject the promise once we provide a empty string of
+    // storage id.
+    bool ok =
+        SendProvideStorageId(CDMStorageIdProvider::ComputeStorageId(mNodeId));
+    if (!ok) {
+      GMP_PARENT_LOG_DEBUG("%s: Failed to send storage id to child process",
+                           __FUNCTION__);
+      return NS_ERROR_FAILURE;
+    }
+    GMP_PARENT_LOG_DEBUG("%s: Sent storage id to child process", __FUNCTION__);
+
+#if defined(XP_WIN) || defined(XP_LINUX)
+    if (!mLibs.IsEmpty()) {
+      bool ok = SendPreloadLibs(mLibs);
+      if (!ok) {
+        GMP_PARENT_LOG_DEBUG("%s: Failed to send preload-libs to child process",
+                             __FUNCTION__);
+        return NS_ERROR_FAILURE;
+      }
+      GMP_PARENT_LOG_DEBUG("%s: Sent preload-libs ('%s') to child process",
+                           __FUNCTION__, mLibs.get());
+    }
+#endif
+
+    NS_DispatchToMainThread(new NotifyGMPProcessLoadedTask(OtherPid(), this));
+
+    // Intr call to block initialization on plugin load.
+    if (!SendStartPlugin(mAdapter)) {
+      GMP_PARENT_LOG_DEBUG("%s: Failed to send start to child process",
+                           __FUNCTION__);
+      return NS_ERROR_FAILURE;
+    }
+    GMP_PARENT_LOG_DEBUG("%s: Sent StartPlugin to child process", __FUNCTION__);
+  }
+
+  mState = GMPStateLoaded;
+
+  // Hold a self ref while the child process is alive. This ensures that
+  // during shutdown the GMPParent stays alive long enough to
+  // terminate the child process.
+  MOZ_ASSERT(!mHoldingSelfRef);
+  mHoldingSelfRef = true;
+  AddRef();
+
+  return NS_OK;
+}
+
+mozilla::ipc::IPCResult GMPParent::RecvPGMPContentChildDestroyed() {
+  --mGMPContentChildCount;
+  if (!IsUsed()) {
+    CloseIfUnused();
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPParent::RecvFOGData(ByteBuf&& aBuf) {
+  GMP_PARENT_LOG_DEBUG("GMPParent RecvFOGData");
+  glean::FOGData(std::move(aBuf));
+  return IPC_OK();
+}
+
+void GMPParent::CloseIfUnused() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMP_PARENT_LOG_DEBUG("%s", __FUNCTION__);
+
+  if ((mDeleteProcessOnlyOnUnload || mState == GMPStateLoaded ||
+       mState == GMPStateUnloading) &&
+      !IsUsed()) {
+    // Ensure all timers are killed.
+    for (uint32_t i = mTimers.Length(); i > 0; i--) {
+      mTimers[i - 1]->Shutdown();
+    }
+
+    // Shutdown GMPStorage. Given that all protocol actors must be shutdown
+    // (!Used() is true), all storage operations should be complete.
+    for (size_t i = mStorage.Length(); i > 0; i--) {
+      mStorage[i - 1]->Shutdown();
+    }
+    Shutdown();
+  }
+}
+
+void GMPParent::CloseActive(bool aDieWhenUnloaded) {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMP_PARENT_LOG_DEBUG("%s: state %d", __FUNCTION__, mState);
+
+  if (aDieWhenUnloaded) {
+    mDeleteProcessOnlyOnUnload = true;  // don't allow this to go back...
+  }
+  if (mState == GMPStateLoaded) {
+    mState = GMPStateUnloading;
+  }
+  if (mState != GMPStateNotLoaded && IsUsed()) {
+    Unused << SendCloseActive();
+    CloseIfUnused();
+  }
+}
+
+void GMPParent::MarkForDeletion() {
+  mDeleteProcessOnlyOnUnload = true;
+  mIsBlockingDeletion = true;
+}
+
+bool GMPParent::IsMarkedForDeletion() { return mIsBlockingDeletion; }
+
+void GMPParent::Shutdown() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMP_PARENT_LOG_DEBUG("%s", __FUNCTION__);
+
+  if (mAbnormalShutdownInProgress) {
+    return;
+  }
+
+  MOZ_ASSERT(!IsUsed());
+  if (mState == GMPStateNotLoaded || mState == GMPStateClosing) {
+    return;
+  }
+
+  RefPtr<GMPParent> self(this);
+  DeleteProcess();
+
+  // XXX Get rid of mDeleteProcessOnlyOnUnload and this code when
+  // Bug 1043671 is fixed
+  if (!mDeleteProcessOnlyOnUnload) {
+    // Destroy ourselves and rise from the fire to save memory
+    mService->ReAddOnGMPThread(self);
+  }  // else we've been asked to die and stay dead
+  MOZ_ASSERT(mState == GMPStateNotLoaded);
+}
+
+class NotifyGMPShutdownTask : public Runnable {
+ public:
+  explicit NotifyGMPShutdownTask(const nsAString& aNodeId)
+      : Runnable("NotifyGMPShutdownTask"), mNodeId(aNodeId) {}
+  NS_IMETHOD Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+    nsCOMPtr<nsIObserverService> obsService =
+        mozilla::services::GetObserverService();
+    MOZ_ASSERT(obsService);
+    if (obsService) {
+      obsService->NotifyObservers(nullptr, "gmp-shutdown", mNodeId.get());
+    }
+    return NS_OK;
+  }
+  nsString mNodeId;
+};
+
+void GMPParent::ChildTerminated() {
+  RefPtr<GMPParent> self(this);
+  nsCOMPtr<nsISerialEventTarget> gmpEventTarget = GMPEventTarget();
+
+  if (!gmpEventTarget) {
+    // Bug 1163239 - this can happen on shutdown.
+    // PluginTerminated removes the GMP from the GMPService.
+    // On shutdown we can have this case where it is already been
+    // removed so there is no harm in not trying to remove it again.
+    GMP_PARENT_LOG_DEBUG("%s::%s: GMPEventTarget() returned nullptr.",
+                         __CLASS__, __FUNCTION__);
+  } else {
+    gmpEventTarget->Dispatch(
+        NewRunnableMethod<RefPtr<GMPParent>>(
+            "gmp::GeckoMediaPluginServiceParent::PluginTerminated", mService,
+            &GeckoMediaPluginServiceParent::PluginTerminated, self),
+        NS_DISPATCH_NORMAL);
+  }
+}
+
+void GMPParent::DeleteProcess() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMP_PARENT_LOG_DEBUG("%s", __FUNCTION__);
+
+  if (mState != GMPStateClosing) {
+    // Don't Close() twice!
+    // Probably remove when bug 1043671 is resolved
+    mState = GMPStateClosing;
+    Close();
+  }
+  mProcess->Delete(NewRunnableMethod("gmp::GMPParent::ChildTerminated", this,
+                                     &GMPParent::ChildTerminated));
+  GMP_PARENT_LOG_DEBUG("%s: Shut down process", __FUNCTION__);
+  mProcess = nullptr;
+
+#if defined(MOZ_WIDGET_ANDROID)
+  if (mState != GMPStateNotLoaded) {
+    nsCOMPtr<nsIEventTarget> launcherThread(GetIPCLauncher());
+    MOZ_ASSERT(launcherThread);
+
+    auto procType = java::GeckoProcessType::GMPLUGIN();
+    auto selector =
+        java::GeckoProcessManager::Selector::New(procType, OtherPid());
+
+    launcherThread->Dispatch(NS_NewRunnableFunction(
+        "GMPParent::DeleteProcess",
+        [selector =
+             java::GeckoProcessManager::Selector::GlobalRef(selector)]() {
+          java::GeckoProcessManager::ShutdownProcess(selector);
+        }));
+  }
+#endif  // defined(MOZ_WIDGET_ANDROID)
+
+  mState = GMPStateNotLoaded;
+
+  nsCOMPtr<nsIRunnable> r =
+      new NotifyGMPShutdownTask(NS_ConvertUTF8toUTF16(mNodeId));
+  mMainThread->Dispatch(r.forget());
+
+  if (mHoldingSelfRef) {
+    Release();
+    mHoldingSelfRef = false;
+  }
+}
+
+GMPState GMPParent::State() const { return mState; }
+
+nsCOMPtr<nsISerialEventTarget> GMPParent::GMPEventTarget() {
+  nsCOMPtr<mozIGeckoMediaPluginService> mps =
+      do_GetService("@mozilla.org/gecko-media-plugin-service;1");
+  MOZ_ASSERT(mps);
+  if (!mps) {
+    return nullptr;
+  }
+  // Note: GeckoMediaPluginService::GetThread() is threadsafe, and returns
+  // nullptr if the GeckoMediaPluginService has started shutdown.
+  nsCOMPtr<nsIThread> gmpThread;
+  mps->GetThread(getter_AddRefs(gmpThread));
+  return gmpThread ? gmpThread->SerialEventTarget() : nullptr;
+}
+
+/* static */
+bool GMPCapability::Supports(const nsTArray<GMPCapability>& aCapabilities,
+                             const nsACString& aAPI,
+                             const nsTArray<nsCString>& aTags) {
+  for (const nsCString& tag : aTags) {
+    if (!GMPCapability::Supports(aCapabilities, aAPI, tag)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+/* static */
+bool GMPCapability::Supports(const nsTArray<GMPCapability>& aCapabilities,
+                             const nsACString& aAPI, const nsCString& aTag) {
+  for (const GMPCapability& capabilities : aCapabilities) {
+    if (!capabilities.mAPIName.Equals(aAPI)) {
+      continue;
+    }
+    for (const nsCString& tag : capabilities.mAPITags) {
+      if (tag.Equals(aTag)) {
+#ifdef XP_WIN
+        // Clearkey on Windows advertises that it can decode in its GMP info
+        // file, but uses Windows Media Foundation to decode. That's not present
+        // on Windows XP, and on some Vista, Windows N, and KN variants without
+        // certain services packs.
+        if (tag.EqualsLiteral(kClearKeyKeySystemName)) {
+          if (capabilities.mAPIName.EqualsLiteral(GMP_API_VIDEO_DECODER)) {
+            if (!WMFDecoderModule::CanCreateMFTDecoder(WMFStreamType::H264)) {
+              continue;
+            }
+          }
+        }
+#endif
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+bool GMPParent::EnsureProcessLoaded() {
+  if (mState == GMPStateLoaded) {
+    return true;
+  }
+  if (mState == GMPStateClosing || mState == GMPStateUnloading) {
+    return false;
+  }
+
+  nsresult rv = LoadProcess();
+
+  return NS_SUCCEEDED(rv);
+}
+
+void GMPParent::AddCrashAnnotations() {
+  if (mCrashReporter) {
+    mCrashReporter->AddAnnotation(CrashReporter::Annotation::GMPPlugin, true);
+    mCrashReporter->AddAnnotation(CrashReporter::Annotation::PluginFilename,
+                                  NS_ConvertUTF16toUTF8(mName));
+    mCrashReporter->AddAnnotation(CrashReporter::Annotation::PluginName,
+                                  mDisplayName);
+    mCrashReporter->AddAnnotation(CrashReporter::Annotation::PluginVersion,
+                                  mVersion);
+  }
+}
+
+void GMPParent::GetCrashID(nsString& aResult) {
+  AddCrashAnnotations();
+  GenerateCrashReport(OtherPid(), &aResult);
+}
+
+static void GMPNotifyObservers(const uint32_t aPluginID,
+                               const nsACString& aPluginName,
+                               const nsAString& aPluginDumpID) {
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  nsCOMPtr<nsIWritablePropertyBag2> propbag =
+      do_CreateInstance("@mozilla.org/hash-property-bag;1");
+  if (obs && propbag) {
+    propbag->SetPropertyAsUint32(u"pluginID"_ns, aPluginID);
+    propbag->SetPropertyAsACString(u"pluginName"_ns, aPluginName);
+    propbag->SetPropertyAsAString(u"pluginDumpID"_ns, aPluginDumpID);
+    obs->NotifyObservers(propbag, "gmp-plugin-crash", nullptr);
+  }
+
+  RefPtr<gmp::GeckoMediaPluginService> service =
+      gmp::GeckoMediaPluginService::GetGeckoMediaPluginService();
+  if (service) {
+    service->RunPluginCrashCallbacks(aPluginID, aPluginName);
+  }
+}
+
+void GMPParent::ActorDestroy(ActorDestroyReason aWhy) {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMP_PARENT_LOG_DEBUG("%s: (%d)", __FUNCTION__, (int)aWhy);
+
+  if (AbnormalShutdown == aWhy) {
+    Telemetry::Accumulate(Telemetry::SUBPROCESS_ABNORMAL_ABORT, "gmplugin"_ns,
+                          1);
+    nsString dumpID;
+    GetCrashID(dumpID);
+    if (dumpID.IsEmpty()) {
+      NS_WARNING("GMP crash without crash report");
+      dumpID = mName;
+      dumpID += '-';
+      AppendUTF8toUTF16(mVersion, dumpID);
+    }
+
+    // NotifyObservers is mainthread-only
+    nsCOMPtr<nsIRunnable> r =
+        WrapRunnableNM(&GMPNotifyObservers, mPluginId, mDisplayName, dumpID);
+    mMainThread->Dispatch(r.forget());
+  }
+
+  // warn us off trying to close again
+  mState = GMPStateClosing;
+  mAbnormalShutdownInProgress = true;
+  CloseActive(false);
+
+  // Normal Shutdown() will delete the process on unwind.
+  if (AbnormalShutdown == aWhy) {
+    RefPtr<GMPParent> self(this);
+    // Must not call Close() again in DeleteProcess(), as we'll recurse
+    // infinitely if we do.
+    MOZ_ASSERT(mState == GMPStateClosing);
+    DeleteProcess();
+    // Note: final destruction will be Dispatched to ourself
+    mService->ReAddOnGMPThread(self);
+  }
+}
+
+PGMPStorageParent* GMPParent::AllocPGMPStorageParent() {
+  GMPStorageParent* p = new GMPStorageParent(mNodeId, this);
+  mStorage.AppendElement(p);  // Addrefs, released in DeallocPGMPStorageParent.
+  return p;
+}
+
+bool GMPParent::DeallocPGMPStorageParent(PGMPStorageParent* aActor) {
+  GMPStorageParent* p = static_cast<GMPStorageParent*>(aActor);
+  p->Shutdown();
+  mStorage.RemoveElement(p);
+  return true;
+}
+
+mozilla::ipc::IPCResult GMPParent::RecvPGMPStorageConstructor(
+    PGMPStorageParent* aActor) {
+  GMPStorageParent* p = (GMPStorageParent*)aActor;
+  if (NS_FAILED(p->Init())) {
+    // TODO: Verify if this is really a good reason to IPC_FAIL.
+    // There might be shutdown edge cases here.
+    return IPC_FAIL(this,
+                    "GMPParent::RecvPGMPStorageConstructor: p->Init() failed.");
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPParent::RecvPGMPTimerConstructor(
+    PGMPTimerParent* actor) {
+  return IPC_OK();
+}
+
+PGMPTimerParent* GMPParent::AllocPGMPTimerParent() {
+  nsCOMPtr<nsISerialEventTarget> target = GMPEventTarget();
+  GMPTimerParent* p = new GMPTimerParent(target);
+  mTimers.AppendElement(
+      p);  // Released in DeallocPGMPTimerParent, or on shutdown.
+  return p;
+}
+
+bool GMPParent::DeallocPGMPTimerParent(PGMPTimerParent* aActor) {
+  GMPTimerParent* p = static_cast<GMPTimerParent*>(aActor);
+  p->Shutdown();
+  mTimers.RemoveElement(p);
+  return true;
+}
+
+bool ReadInfoField(GMPInfoFileParser& aParser, const nsCString& aKey,
+                   nsACString& aOutValue) {
+  if (!aParser.Contains(aKey) || aParser.Get(aKey).IsEmpty()) {
+    return false;
+  }
+  aOutValue = aParser.Get(aKey);
+  return true;
+}
+
+RefPtr<GenericPromise> GMPParent::ReadGMPMetaData() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  MOZ_ASSERT(mDirectory, "Plugin directory cannot be NULL!");
+  MOZ_ASSERT(!mName.IsEmpty(), "Plugin mName cannot be empty!");
+
+  nsCOMPtr<nsIFile> infoFile;
+  nsresult rv = mDirectory->Clone(getter_AddRefs(infoFile));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+  infoFile->AppendRelativePath(mName + u".info"_ns);
+
+  if (FileExists(infoFile)) {
+    return ReadGMPInfoFile(infoFile);
+  }
+
+  // Maybe this is the Widevine adapted plugin?
+  nsCOMPtr<nsIFile> manifestFile;
+  rv = mDirectory->Clone(getter_AddRefs(manifestFile));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+  manifestFile->AppendRelativePath(u"manifest.json"_ns);
+  return ReadChromiumManifestFile(manifestFile);
+}
+
+#if defined(XP_LINUX)
+static void ApplyGlibcWorkaround(nsCString& aLibs) {
+  // These glibc libraries were merged into libc.so.6 as of glibc
+  // 2.34; they now exist only as stub libraries for compatibility and
+  // newly linked code won't depend on them, so we need to ensure
+  // they're loaded for plugins that may have been linked against a
+  // different version of glibc.  (See also bug 1725828.)
+  if (!aLibs.IsEmpty()) {
+    aLibs.AppendLiteral(", ");
+  }
+  aLibs.AppendLiteral("libdl.so.2, libpthread.so.0, librt.so.1");
+}
+#endif
+
+#if defined(XP_WIN)
+static void ApplyOleaut32(nsCString& aLibs) {
+  // In the libwebrtc update in bug 1766646 an include of comdef.h for using
+  // _bstr_t was introduced. This resulted in a dependency on comsupp.lib which
+  // contains a `_variant_t vtMissing` that would get cleared in an exit
+  // handler. VariantClear is defined in oleaut32.dll, and so we'd try to load
+  // oleaut32.dll on exit but get denied by the sandbox.
+  // Note that we had includes of comdef.h before bug 1766646 but it is the use
+  // of _bstr_t that triggers the vtMissing exit handler.
+  // See bug 1788592 for details.
+  if (!aLibs.IsEmpty()) {
+    aLibs.AppendLiteral(", ");
+  }
+  aLibs.AppendLiteral("oleaut32.dll");
+}
+#endif
+
+RefPtr<GenericPromise> GMPParent::ReadGMPInfoFile(nsIFile* aFile) {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMPInfoFileParser parser;
+  if (!parser.Init(aFile)) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  nsAutoCString apis;
+  if (!ReadInfoField(parser, "name"_ns, mDisplayName) ||
+      !ReadInfoField(parser, "description"_ns, mDescription) ||
+      !ReadInfoField(parser, "version"_ns, mVersion) ||
+      !ReadInfoField(parser, "apis"_ns, apis)) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+#if defined(XP_WIN) || defined(XP_LINUX)
+  // "Libraries" field is optional.
+  ReadInfoField(parser, "libraries"_ns, mLibs);
+#endif
+
+#ifdef XP_LINUX
+  // The glibc workaround (see above) isn't needed for clearkey
+  // because it's built along with the browser.
+  if (!mDisplayName.EqualsASCII("clearkey")) {
+    ApplyGlibcWorkaround(mLibs);
+  }
+#endif
+
+#ifdef XP_WIN
+  ApplyOleaut32(mLibs);
+#endif
+
+  nsTArray<nsCString> apiTokens;
+  SplitAt(", ", apis, apiTokens);
+  for (nsCString api : apiTokens) {
+    int32_t tagsStart = api.FindChar('[');
+    if (tagsStart == 0) {
+      // Not allowed to be the first character.
+      // API name must be at least one character.
+      continue;
+    }
+
+    GMPCapability cap;
+    if (tagsStart == -1) {
+      // No tags.
+      cap.mAPIName.Assign(api);
+    } else {
+      auto tagsEnd = api.FindChar(']');
+      if (tagsEnd == -1 || tagsEnd < tagsStart) {
+        // Invalid syntax, skip whole capability.
+        continue;
+      }
+
+      cap.mAPIName.Assign(Substring(api, 0, tagsStart));
+
+      if ((tagsEnd - tagsStart) > 1) {
+        const nsDependentCSubstring ts(
+            Substring(api, tagsStart + 1, tagsEnd - tagsStart - 1));
+        nsTArray<nsCString> tagTokens;
+        SplitAt(":", ts, tagTokens);
+        for (nsCString tag : tagTokens) {
+          cap.mAPITags.AppendElement(tag);
+        }
+      }
+    }
+
+    mCapabilities.AppendElement(std::move(cap));
+  }
+
+  if (mCapabilities.IsEmpty()) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  return GenericPromise::CreateAndResolve(true, __func__);
+}
+
+RefPtr<GenericPromise> GMPParent::ReadChromiumManifestFile(nsIFile* aFile) {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  nsAutoCString json;
+  if (!ReadIntoString(aFile, json, 5 * 1024)) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  // DOM JSON parsing needs to run on the main thread.
+  return InvokeAsync(mMainThread, this, __func__,
+                     &GMPParent::ParseChromiumManifest,
+                     NS_ConvertUTF8toUTF16(json));
+}
+
+static bool IsCDMAPISupported(
+    const mozilla::dom::WidevineCDMManifest& aManifest) {
+  nsresult ignored;  // Note: ToInteger returns 0 on failure.
+  int32_t moduleVersion = aManifest.mX_cdm_module_versions.ToInteger(&ignored);
+  int32_t interfaceVersion =
+      aManifest.mX_cdm_interface_versions.ToInteger(&ignored);
+  int32_t hostVersion = aManifest.mX_cdm_host_versions.ToInteger(&ignored);
+  return ChromiumCDMAdapter::Supports(moduleVersion, interfaceVersion,
+                                      hostVersion);
+}
+
+RefPtr<GenericPromise> GMPParent::ParseChromiumManifest(
+    const nsAString& aJSON) {
+  GMP_PARENT_LOG_DEBUG("%s: for '%s'", __FUNCTION__,
+                       NS_LossyConvertUTF16toASCII(aJSON).get());
+
+  MOZ_ASSERT(NS_IsMainThread());
+  mozilla::dom::WidevineCDMManifest m;
+  if (!m.Init(aJSON)) {
+    GMP_PARENT_LOG_DEBUG("%s: Failed to initialize json parser, failing.",
+                         __FUNCTION__);
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  if (!IsCDMAPISupported(m)) {
+    GMP_PARENT_LOG_DEBUG("%s: CDM API not supported, failing.", __FUNCTION__);
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  CopyUTF16toUTF8(m.mName, mDisplayName);
+  CopyUTF16toUTF8(m.mDescription, mDescription);
+  CopyUTF16toUTF8(m.mVersion, mVersion);
+
+#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+  if (!mozilla::SandboxInfo::Get().CanSandboxMedia()) {
+    nsPrintfCString msg(
+        "GMPParent::ParseChromiumManifest: Plugin \"%s\" is an EME CDM"
+        " but this system can't sandbox it; not loading.",
+        mDisplayName.get());
+    printf_stderr("%s\n", msg.get());
+    GMP_PARENT_LOG_DEBUG("%s", msg.get());
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+#endif
+
+  GMPCapability video;
+
+  // We hard code a few of the settings because they can't be stored in the
+  // widevine manifest without making our API different to widevine's.
+  if (mDisplayName.EqualsASCII("clearkey")) {
+    video.mAPITags.AppendElement(nsCString{kClearKeyKeySystemName});
+    video.mAPITags.AppendElement(
+        nsCString{kClearKeyWithProtectionQueryKeySystemName});
+#if XP_WIN
+    mLibs = nsLiteralCString(
+        "dxva2.dll, evr.dll, freebl3.dll, mfh264dec.dll, mfplat.dll, "
+        "msmpeg2vdec.dll, nss3.dll, softokn3.dll");
+#elif XP_LINUX
+    mLibs = "libfreeblpriv3.so, libsoftokn3.so"_ns;
+#endif
+  } else if (mDisplayName.EqualsASCII("WidevineCdm")) {
+    video.mAPITags.AppendElement(nsCString{kWidevineKeySystemName});
+#if XP_WIN
+    // psapi.dll added for GetMappedFileNameW, which could possibly be avoided
+    // in future versions, see bug 1383611 for details.
+    mLibs = "dxva2.dll, ole32.dll, psapi.dll, winmm.dll"_ns;
+#endif
+  } else if (mDisplayName.EqualsASCII("fake")) {
+    // The fake CDM just exposes a key system with id "fake".
+    video.mAPITags.AppendElement(nsCString{"fake"});
+#if XP_WIN
+    mLibs = "dxva2.dll, ole32.dll"_ns;
+#endif
+  } else {
+    GMP_PARENT_LOG_DEBUG("%s: Unrecognized key system: %s, failing.",
+                         __FUNCTION__, mDisplayName.get());
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+#ifdef XP_LINUX
+  ApplyGlibcWorkaround(mLibs);
+#endif
+
+#ifdef XP_WIN
+  ApplyOleaut32(mLibs);
+#endif
+
+  nsCString codecsString = NS_ConvertUTF16toUTF8(m.mX_cdm_codecs);
+  nsTArray<nsCString> codecs;
+  SplitAt(",", codecsString, codecs);
+
+  // Parse the codec strings in the manifest and map them to strings used
+  // internally by Gecko for capability recognition.
+  //
+  // Google's code to parse manifests can be used as a reference for strings
+  // the manifest may contain
+  // https://source.chromium.org/chromium/chromium/src/+/master:components/cdm/common/cdm_manifest.cc;l=74;drc=775880ced8a989191281e93854c7f2201f25068f
+  //
+  // Gecko's internal strings can be found at
+  // https://searchfox.org/mozilla-central/rev/ea63a0888d406fae720cf24f4727d87569a8cab5/dom/media/eme/MediaKeySystemAccess.cpp#149-155
+  for (const nsCString& chromiumCodec : codecs) {
+    nsCString codec;
+    if (chromiumCodec.EqualsASCII("vp8")) {
+      codec = "vp8"_ns;
+    } else if (chromiumCodec.EqualsASCII("vp9.0") ||  // Legacy string.
+               chromiumCodec.EqualsASCII("vp09")) {
+      codec = "vp9"_ns;
+    } else if (chromiumCodec.EqualsASCII("avc1")) {
+      codec = "h264"_ns;
+    } else if (chromiumCodec.EqualsASCII("av01")) {
+      codec = "av1"_ns;
+    } else {
+      GMP_PARENT_LOG_DEBUG("%s: Unrecognized codec: %s.", __FUNCTION__,
+                           chromiumCodec.get());
+      MOZ_ASSERT_UNREACHABLE(
+          "Unhandled codec string! Need to add it to the parser.");
+      continue;
+    }
+
+    video.mAPITags.AppendElement(codec);
+  }
+
+  video.mAPIName = nsLiteralCString(CHROMIUM_CDM_API);
+  mAdapter = u"chromium"_ns;
+
+  mCapabilities.AppendElement(std::move(video));
+
+  GMP_PARENT_LOG_DEBUG("%s: Successfully parsed manifest.", __FUNCTION__);
+  return GenericPromise::CreateAndResolve(true, __func__);
+}
+
+bool GMPParent::CanBeSharedCrossNodeIds() const {
+  return mNodeId.IsEmpty() &&
+         // XXX bug 1159300 hack -- maybe remove after openh264 1.4
+         // We don't want to use CDM decoders for non-encrypted playback
+         // just yet; especially not for WebRTC. Don't allow CDMs to be used
+         // without a node ID.
+         !mCanDecrypt;
+}
+
+bool GMPParent::CanBeUsedFrom(const nsACString& aNodeId) const {
+  return mNodeId == aNodeId;
+}
+
+void GMPParent::SetNodeId(const nsACString& aNodeId) {
+  MOZ_ASSERT(!aNodeId.IsEmpty());
+  mNodeId = aNodeId;
+}
+
+const nsCString& GMPParent::GetDisplayName() const { return mDisplayName; }
+
+const nsCString& GMPParent::GetVersion() const { return mVersion; }
+
+uint32_t GMPParent::GetPluginId() const { return mPluginId; }
+
+void GMPParent::ResolveGetContentParentPromises() {
+  nsTArray<UniquePtr<MozPromiseHolder<GetGMPContentParentPromise>>> promises =
+      std::move(mGetContentParentPromises);
+  MOZ_ASSERT(mGetContentParentPromises.IsEmpty());
+  RefPtr<GMPContentParent::CloseBlocker> blocker(
+      new GMPContentParent::CloseBlocker(mGMPContentParent));
+  for (auto& holder : promises) {
+    holder->Resolve(blocker, __func__);
+  }
+}
+
+bool GMPParent::OpenPGMPContent() {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  MOZ_ASSERT(!mGMPContentParent);
+
+  Endpoint<PGMPContentParent> parent;
+  Endpoint<PGMPContentChild> child;
+  if (NS_WARN_IF(NS_FAILED(PGMPContent::CreateEndpoints(
+          base::GetCurrentProcId(), OtherPid(), &parent, &child)))) {
+    return false;
+  }
+
+  mGMPContentParent = new GMPContentParent(this);
+
+  if (!parent.Bind(mGMPContentParent)) {
+    return false;
+  }
+
+  if (!SendInitGMPContentChild(std::move(child))) {
+    return false;
+  }
+
+  ResolveGetContentParentPromises();
+
+  return true;
+}
+
+void GMPParent::RejectGetContentParentPromises() {
+  nsTArray<UniquePtr<MozPromiseHolder<GetGMPContentParentPromise>>> promises =
+      std::move(mGetContentParentPromises);
+  MOZ_ASSERT(mGetContentParentPromises.IsEmpty());
+  for (auto& holder : promises) {
+    holder->Reject(NS_ERROR_FAILURE, __func__);
+  }
+}
+
+void GMPParent::GetGMPContentParent(
+    UniquePtr<MozPromiseHolder<GetGMPContentParentPromise>>&& aPromiseHolder) {
+  MOZ_ASSERT(GMPEventTarget()->IsOnCurrentThread());
+  GMP_PARENT_LOG_DEBUG("%s %p", __FUNCTION__, this);
+
+  if (mGMPContentParent) {
+    RefPtr<GMPContentParent::CloseBlocker> blocker(
+        new GMPContentParent::CloseBlocker(mGMPContentParent));
+    aPromiseHolder->Resolve(blocker, __func__);
+  } else {
+    mGetContentParentPromises.AppendElement(std::move(aPromiseHolder));
+    // If we don't have a GMPContentParent and we try to get one for the first
+    // time (mGetContentParentPromises.Length() == 1) then call
+    // PGMPContent::Open. If more calls to GetGMPContentParent happen before
+    // mGMPContentParent has been set then we should just store them, so that
+    // they get called when we set mGMPContentParent as a result of the
+    // PGMPContent::Open call.
+    if (mGetContentParentPromises.Length() == 1) {
+      if (!EnsureProcessLoaded() || !OpenPGMPContent()) {
+        RejectGetContentParentPromises();
+        return;
+      }
+      // We want to increment this as soon as possible, to avoid that we'd try
+      // to shut down the GMP process while we're still trying to get a
+      // PGMPContentParent actor.
+      ++mGMPContentChildCount;
+    }
+  }
+}
+
+already_AddRefed<GMPContentParent> GMPParent::ForgetGMPContentParent() {
+  MOZ_ASSERT(mGetContentParentPromises.IsEmpty());
+  return mGMPContentParent.forget();
+}
+
+bool GMPParent::EnsureProcessLoaded(base::ProcessId* aID) {
+  if (!EnsureProcessLoaded()) {
+    return false;
+  }
+  *aID = OtherPid();
+  return true;
+}
+
+void GMPParent::IncrementGMPContentChildCount() { ++mGMPContentChildCount; }
+
+nsString GMPParent::GetPluginBaseName() const { return u"gmp-"_ns + mName; }
+
+#if defined(XP_MACOSX) && defined(__aarch64__)
+void GMPParent::PreTranslateBins() {
+  nsCOMPtr<nsIRunnable> event = mozilla::NewRunnableMethod(
+      "RosettaTranslation", this, &GMPParent::PreTranslateBinsWorker);
+
+  DebugOnly<nsresult> rv =
+      NS_DispatchBackgroundTask(event.forget(), NS_DISPATCH_EVENT_MAY_BLOCK);
+
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+}
+
+void GMPParent::PreTranslateBinsWorker() {
+  int rv = nsMacUtilsImpl::PreTranslateXUL();
+  GMP_PARENT_LOG_DEBUG("%s: XUL translation result: %d", __FUNCTION__, rv);
+
+  rv = nsMacUtilsImpl::PreTranslateBinary(mPluginFilePath);
+  GMP_PARENT_LOG_DEBUG("%s: %s translation result: %d", __FUNCTION__,
+                       mPluginFilePath.get(), rv);
+}
+#endif
+
+}  // namespace mozilla::gmp
+
+#undef GMP_PARENT_LOG_DEBUG
+#undef __CLASS__
diff --git a/dom/media/gmp/GMPParent.h b/dom/media/gmp/GMPParent.h
new file mode 100644
index 0000000000..fa5a433c7b
--- /dev/null
+++ b/dom/media/gmp/GMPParent.h
@@ -0,0 +1,248 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPParent_h_
+#define GMPParent_h_
+
+#include "GMPProcessParent.h"
+#include "GMPServiceParent.h"
+#include "GMPVideoDecoderParent.h"
+#include "GMPVideoEncoderParent.h"
+#include "GMPTimerParent.h"
+#include "GMPStorageParent.h"
+#include "mozilla/gmp/PGMPParent.h"
+#include "mozilla/ipc/CrashReporterHelper.h"
+#include "nsCOMPtr.h"
+#include "nscore.h"
+#include "nsISupports.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "nsIFile.h"
+#include "mozilla/MozPromise.h"
+
+namespace mozilla::gmp {
+
+class GMPCapability {
+ public:
+  explicit GMPCapability() = default;
+  GMPCapability(GMPCapability&& aOther)
+      : mAPIName(std::move(aOther.mAPIName)),
+        mAPITags(std::move(aOther.mAPITags)) {}
+  explicit GMPCapability(const nsACString& aAPIName) : mAPIName(aAPIName) {}
+  explicit GMPCapability(const GMPCapability& aOther) = default;
+  nsCString mAPIName;
+  CopyableTArray<nsCString> mAPITags;
+
+  static bool Supports(const nsTArray<GMPCapability>& aCapabilities,
+                       const nsACString& aAPI,
+                       const nsTArray<nsCString>& aTags);
+
+  static bool Supports(const nsTArray<GMPCapability>& aCapabilities,
+                       const nsACString& aAPI, const nsCString& aTag);
+};
+
+enum GMPState {
+  GMPStateNotLoaded,
+  GMPStateLoaded,
+  GMPStateUnloading,
+  GMPStateClosing
+};
+
+class GMPContentParent;
+
+class GMPParent final
+    : public PGMPParent,
+      public ipc::CrashReporterHelper<GeckoProcessType_GMPlugin> {
+  friend class PGMPParent;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPParent)
+
+  GMPParent();
+
+  RefPtr<GenericPromise> Init(GeckoMediaPluginServiceParent* aService,
+                              nsIFile* aPluginDir);
+  void CloneFrom(const GMPParent* aOther);
+
+  void Crash();
+
+  nsresult LoadProcess();
+
+  // Called internally to close this if we don't need it
+  void CloseIfUnused();
+
+  // Notify all active de/encoders that we are closing, either because of
+  // normal shutdown or unexpected shutdown/crash.
+  void CloseActive(bool aDieWhenUnloaded);
+
+  // Tell the plugin to die after shutdown.
+  void MarkForDeletion();
+  bool IsMarkedForDeletion();
+
+  // Called by the GMPService to forcibly close active de/encoders at shutdown
+  void Shutdown();
+
+  // This must not be called while we're in the middle of abnormal ActorDestroy
+  void DeleteProcess();
+
+  GMPState State() const;
+  nsCOMPtr<nsISerialEventTarget> GMPEventTarget();
+
+  // A GMP can either be a single instance shared across all NodeIds (like
+  // in the OpenH264 case), or we can require a new plugin instance for every
+  // NodeIds running the plugin (as in the EME plugin case).
+  //
+  // A NodeId is a hash of the ($urlBarOrigin, $ownerDocOrigin) pair.
+  //
+  // Plugins are associated with an NodeIds by calling SetNodeId() before
+  // loading.
+  //
+  // If a plugin has no NodeId specified and it is loaded, it is assumed to
+  // be shared across NodeIds.
+
+  // Specifies that a GMP can only work with the specified NodeIds.
+  void SetNodeId(const nsACString& aNodeId);
+  const nsACString& GetNodeId() const { return mNodeId; }
+
+  const nsCString& GetDisplayName() const;
+  const nsCString& GetVersion() const;
+  uint32_t GetPluginId() const;
+  nsString GetPluginBaseName() const;
+
+  // Returns true if a plugin can be or is being used across multiple NodeIds.
+  bool CanBeSharedCrossNodeIds() const;
+
+  // A GMP can be used from a NodeId if it's already been set to work with
+  // that NodeId, or if it's not been set to work with any NodeId and has
+  // not yet been loaded (i.e. it's not shared across NodeIds).
+  bool CanBeUsedFrom(const nsACString& aNodeId) const;
+
+  already_AddRefed<nsIFile> GetDirectory() {
+    return nsCOMPtr<nsIFile>(mDirectory).forget();
+  }
+
+  void AbortAsyncShutdown();
+
+  // Called when the child process has died.
+  void ChildTerminated();
+
+  bool OpenPGMPContent();
+
+  void GetGMPContentParent(
+      UniquePtr<MozPromiseHolder<GetGMPContentParentPromise>>&& aPromiseHolder);
+  already_AddRefed<GMPContentParent> ForgetGMPContentParent();
+
+  bool EnsureProcessLoaded(base::ProcessId* aID);
+
+  void IncrementGMPContentChildCount();
+
+  const nsTArray<GMPCapability>& GetCapabilities() const {
+    return mCapabilities;
+  }
+
+ private:
+  ~GMPParent();
+
+  RefPtr<GeckoMediaPluginServiceParent> mService;
+  bool EnsureProcessLoaded();
+  RefPtr<GenericPromise> ReadGMPMetaData();
+  RefPtr<GenericPromise> ReadGMPInfoFile(nsIFile* aFile);
+  RefPtr<GenericPromise> ParseChromiumManifest(
+      const nsAString& aJSON);  // Worker thread.
+  RefPtr<GenericPromise> ReadChromiumManifestFile(
+      nsIFile* aFile);  // GMP thread.
+  void AddCrashAnnotations();
+  void GetCrashID(nsString& aResult);
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+
+  mozilla::ipc::IPCResult RecvPGMPStorageConstructor(
+      PGMPStorageParent* actor) override;
+  PGMPStorageParent* AllocPGMPStorageParent();
+  bool DeallocPGMPStorageParent(PGMPStorageParent* aActor);
+
+  mozilla::ipc::IPCResult RecvPGMPTimerConstructor(
+      PGMPTimerParent* actor) override;
+  PGMPTimerParent* AllocPGMPTimerParent();
+  bool DeallocPGMPTimerParent(PGMPTimerParent* aActor);
+
+  mozilla::ipc::IPCResult RecvPGMPContentChildDestroyed();
+
+  mozilla::ipc::IPCResult RecvFOGData(ByteBuf&& aBuf);
+
+  bool IsUsed() {
+    return mGMPContentChildCount > 0 || !mGetContentParentPromises.IsEmpty();
+  }
+
+  void ResolveGetContentParentPromises();
+  void RejectGetContentParentPromises();
+
+#if defined(XP_MACOSX) && defined(__aarch64__)
+  // We pre-translate XUL and our plugin file to avoid x64 child process
+  // startup delays caused by translation for instances when the child
+  // process binary translations have not already been cached. i.e., the
+  // first time we launch an x64 child process after installation or
+  // update. Measured by binary size of a recent XUL and Widevine plugin,
+  // this makes up 94% of the translation needed. Re-translating the
+  // same binary does not cause translation to occur again.
+  void PreTranslateBins();
+  void PreTranslateBinsWorker();
+#endif
+
+#if defined(XP_MACOSX)
+  nsresult GetPluginFileArch(nsIFile* aPluginDir, nsAutoString& aLeafName,
+                             uint32_t& aArchSet);
+#endif
+
+  GMPState mState;
+  nsCOMPtr<nsIFile> mDirectory;  // plugin directory on disk
+  nsString mName;  // base name of plugin on disk, UTF-16 because used for paths
+  nsCString mDisplayName;  // name of plugin displayed to users
+  nsCString mDescription;  // description of plugin for display to users
+  nsCString mVersion;
+#if defined(XP_WIN) || defined(XP_LINUX)
+  nsCString mLibs;
+#endif
+  nsString mAdapter;
+  const uint32_t mPluginId;
+  nsTArray<GMPCapability> mCapabilities;
+  GMPProcessParent* mProcess;
+  bool mDeleteProcessOnlyOnUnload;
+  bool mAbnormalShutdownInProgress;
+  bool mIsBlockingDeletion;
+
+  bool mCanDecrypt;
+
+  nsTArray<RefPtr<GMPTimerParent>> mTimers;
+  nsTArray<RefPtr<GMPStorageParent>> mStorage;
+  // NodeId the plugin is assigned to, or empty if the the plugin is not
+  // assigned to a NodeId.
+  nsCString mNodeId;
+  // This is used for GMP content in the parent, there may be more of these in
+  // the content processes.
+  RefPtr<GMPContentParent> mGMPContentParent;
+  nsTArray<UniquePtr<MozPromiseHolder<GetGMPContentParentPromise>>>
+      mGetContentParentPromises;
+  uint32_t mGMPContentChildCount;
+
+  int mChildPid;
+
+  // We hold a self reference to ourself while the child process is alive.
+  // This ensures that if the GMPService tries to shut us down and drops
+  // its reference to us, we stay alive long enough for the child process
+  // to terminate gracefully.
+  bool mHoldingSelfRef;
+
+#if defined(XP_MACOSX) && defined(__aarch64__)
+  // The child process architecture to use.
+  uint32_t mChildLaunchArch;
+  nsCString mPluginFilePath;
+#endif
+
+  const nsCOMPtr<nsISerialEventTarget> mMainThread;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPParent_h_
diff --git a/dom/media/gmp/GMPPlatform.cpp b/dom/media/gmp/GMPPlatform.cpp
new file mode 100644
index 0000000000..1a76015ed4
--- /dev/null
+++ b/dom/media/gmp/GMPPlatform.cpp
@@ -0,0 +1,281 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPPlatform.h"
+#include "GMPStorageChild.h"
+#include "GMPTimerChild.h"
+#include "mozilla/Monitor.h"
+#include "GMPChild.h"
+#include "mozilla/Mutex.h"
+#include "base/thread.h"
+#include "base/time.h"
+#include "mozilla/ReentrantMonitor.h"
+
+#include <ctime>
+
+namespace mozilla::gmp {
+
+static MessageLoop* sMainLoop = nullptr;
+static GMPChild* sChild = nullptr;
+
+static bool IsOnChildMainThread() {
+  return sMainLoop && sMainLoop == MessageLoop::current();
+}
+
+// We just need a refcounted wrapper for GMPTask objects.
+class GMPRunnable final {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPRunnable)
+
+  explicit GMPRunnable(GMPTask* aTask) : mTask(aTask) { MOZ_ASSERT(mTask); }
+
+  void Run() {
+    mTask->Run();
+    mTask->Destroy();
+    mTask = nullptr;
+  }
+
+ private:
+  ~GMPRunnable() = default;
+
+  GMPTask* mTask;
+};
+
+class GMPSyncRunnable final {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPSyncRunnable)
+
+  GMPSyncRunnable(GMPTask* aTask, MessageLoop* aMessageLoop)
+      : mDone(false),
+        mTask(aTask),
+        mMessageLoop(aMessageLoop),
+        mMonitor("GMPSyncRunnable") {
+    MOZ_ASSERT(mTask);
+    MOZ_ASSERT(mMessageLoop);
+  }
+
+  void Post() {
+    // We assert here for two reasons.
+    // 1) Nobody should be blocking the main thread.
+    // 2) This prevents deadlocks when doing sync calls to main which if the
+    //    main thread tries to do a sync call back to the calling thread.
+    MOZ_ASSERT(!IsOnChildMainThread());
+
+    mMessageLoop->PostTask(NewRunnableMethod("gmp::GMPSyncRunnable::Run", this,
+                                             &GMPSyncRunnable::Run));
+    MonitorAutoLock lock(mMonitor);
+    while (!mDone) {
+      lock.Wait();
+    }
+  }
+
+  void Run() {
+    mTask->Run();
+    mTask->Destroy();
+    mTask = nullptr;
+    MonitorAutoLock lock(mMonitor);
+    mDone = true;
+    lock.Notify();
+  }
+
+ private:
+  ~GMPSyncRunnable() = default;
+
+  bool mDone;
+  GMPTask* mTask;
+  MessageLoop* mMessageLoop;
+  Monitor mMonitor MOZ_UNANNOTATED;
+};
+
+class GMPThreadImpl : public GMPThread {
+ public:
+  GMPThreadImpl();
+  virtual ~GMPThreadImpl();
+
+  // GMPThread
+  void Post(GMPTask* aTask) override;
+  void Join() override;
+
+ private:
+  Mutex mMutex MOZ_UNANNOTATED;
+  base::Thread mThread;
+};
+
+GMPErr CreateThread(GMPThread** aThread) {
+  if (!aThread) {
+    return GMPGenericErr;
+  }
+
+  *aThread = new GMPThreadImpl();
+
+  return GMPNoErr;
+}
+
+GMPErr RunOnMainThread(GMPTask* aTask) {
+  if (!aTask || !sMainLoop) {
+    return GMPGenericErr;
+  }
+
+  RefPtr<GMPRunnable> r = new GMPRunnable(aTask);
+  sMainLoop->PostTask(
+      NewRunnableMethod("gmp::GMPRunnable::Run", r, &GMPRunnable::Run));
+
+  return GMPNoErr;
+}
+
+GMPErr SyncRunOnMainThread(GMPTask* aTask) {
+  if (!aTask || !sMainLoop || IsOnChildMainThread()) {
+    return GMPGenericErr;
+  }
+
+  RefPtr<GMPSyncRunnable> r = new GMPSyncRunnable(aTask, sMainLoop);
+
+  r->Post();
+
+  return GMPNoErr;
+}
+
+class GMPMutexImpl : public GMPMutex {
+ public:
+  GMPMutexImpl();
+  virtual ~GMPMutexImpl();
+
+  // GMPMutex
+  void Acquire() override;
+  void Release() override;
+  void Destroy() override;
+
+ private:
+  ReentrantMonitor mMonitor MOZ_UNANNOTATED;
+};
+
+GMPErr CreateMutex(GMPMutex** aMutex) {
+  if (!aMutex) {
+    return GMPGenericErr;
+  }
+
+  *aMutex = new GMPMutexImpl();
+
+  return GMPNoErr;
+}
+
+GMPErr CreateRecord(const char* aRecordName, uint32_t aRecordNameSize,
+                    GMPRecord** aOutRecord, GMPRecordClient* aClient) {
+  if (aRecordNameSize > GMP_MAX_RECORD_NAME_SIZE || aRecordNameSize == 0) {
+    NS_WARNING("GMP tried to CreateRecord with too long or 0 record name");
+    return GMPGenericErr;
+  }
+  GMPStorageChild* storage = sChild->GetGMPStorage();
+  if (!storage) {
+    return GMPGenericErr;
+  }
+  MOZ_ASSERT(storage);
+  return storage->CreateRecord(nsDependentCString(aRecordName, aRecordNameSize),
+                               aOutRecord, aClient);
+}
+
+GMPErr SetTimerOnMainThread(GMPTask* aTask, int64_t aTimeoutMS) {
+  if (!aTask || !sMainLoop || !IsOnChildMainThread()) {
+    return GMPGenericErr;
+  }
+  GMPTimerChild* timers = sChild->GetGMPTimers();
+  NS_ENSURE_TRUE(timers, GMPGenericErr);
+  return timers->SetTimer(aTask, aTimeoutMS);
+}
+
+GMPErr GetClock(GMPTimestamp* aOutTime) {
+  if (!aOutTime) {
+    return GMPGenericErr;
+  }
+  *aOutTime = base::Time::Now().ToDoubleT() * 1000.0;
+  return GMPNoErr;
+}
+
+void InitPlatformAPI(GMPPlatformAPI& aPlatformAPI, GMPChild* aChild) {
+  if (!sMainLoop) {
+    sMainLoop = MessageLoop::current();
+  }
+  if (!sChild) {
+    sChild = aChild;
+  }
+
+  aPlatformAPI.version = 0;
+  aPlatformAPI.createthread = &CreateThread;
+  aPlatformAPI.runonmainthread = &RunOnMainThread;
+  aPlatformAPI.syncrunonmainthread = &SyncRunOnMainThread;
+  aPlatformAPI.createmutex = &CreateMutex;
+  aPlatformAPI.createrecord = &CreateRecord;
+  aPlatformAPI.settimer = &SetTimerOnMainThread;
+  aPlatformAPI.getcurrenttime = &GetClock;
+}
+
+void SendFOGData(ipc::ByteBuf&& buf) {
+  if (sChild) {
+    sChild->SendFOGData(std::move(buf));
+  }
+}
+
+GMPThreadImpl::GMPThreadImpl() : mMutex("GMPThreadImpl"), mThread("GMPThread") {
+  MOZ_COUNT_CTOR(GMPThread);
+}
+
+GMPThreadImpl::~GMPThreadImpl() { MOZ_COUNT_DTOR(GMPThread); }
+
+void GMPThreadImpl::Post(GMPTask* aTask) {
+  MutexAutoLock lock(mMutex);
+
+  if (!mThread.IsRunning()) {
+    bool started = mThread.Start();
+    if (!started) {
+      NS_WARNING("Unable to start GMPThread!");
+      return;
+    }
+  }
+
+  RefPtr<GMPRunnable> r = new GMPRunnable(aTask);
+  mThread.message_loop()->PostTask(
+      NewRunnableMethod("gmp::GMPRunnable::Run", r.get(), &GMPRunnable::Run));
+}
+
+void GMPThreadImpl::Join() {
+  {
+    MutexAutoLock lock(mMutex);
+    if (mThread.IsRunning()) {
+      mThread.Stop();
+    }
+  }
+  delete this;
+}
+
+GMPMutexImpl::GMPMutexImpl() : mMonitor("gmp-mutex") {
+  MOZ_COUNT_CTOR(GMPMutexImpl);
+}
+
+GMPMutexImpl::~GMPMutexImpl() { MOZ_COUNT_DTOR(GMPMutexImpl); }
+
+void GMPMutexImpl::Destroy() { delete this; }
+
+MOZ_PUSH_IGNORE_THREAD_SAFETY
+void GMPMutexImpl::Acquire() { mMonitor.Enter(); }
+
+void GMPMutexImpl::Release() { mMonitor.Exit(); }
+MOZ_POP_THREAD_SAFETY
+
+GMPTask* NewGMPTask(std::function<void()>&& aFunction) {
+  class Task : public GMPTask {
+   public:
+    explicit Task(std::function<void()>&& aFunction)
+        : mFunction(std::move(aFunction)) {}
+    void Destroy() override { delete this; }
+    ~Task() override = default;
+    void Run() override { mFunction(); }
+
+   private:
+    std::function<void()> mFunction;
+  };
+  return new Task(std::move(aFunction));
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPPlatform.h b/dom/media/gmp/GMPPlatform.h
new file mode 100644
index 0000000000..ee4571d856
--- /dev/null
+++ b/dom/media/gmp/GMPPlatform.h
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPPlatform_h_
+#define GMPPlatform_h_
+
+#include "gmp-platform.h"
+#include <functional>
+
+namespace mozilla::ipc {
+class ByteBuf;
+}  // namespace mozilla::ipc
+
+namespace mozilla::gmp {
+
+class GMPChild;
+
+void InitPlatformAPI(GMPPlatformAPI& aPlatformAPI, GMPChild* aChild);
+
+GMPErr RunOnMainThread(GMPTask* aTask);
+
+GMPTask* NewGMPTask(std::function<void()>&& aFunction);
+
+GMPErr SetTimerOnMainThread(GMPTask* aTask, int64_t aTimeoutMS);
+
+void SendFOGData(ipc::ByteBuf&& buf);
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPPlatform_h_
diff --git a/dom/media/gmp/GMPProcessChild.cpp b/dom/media/gmp/GMPProcessChild.cpp
new file mode 100644
index 0000000000..6a9c2e3800
--- /dev/null
+++ b/dom/media/gmp/GMPProcessChild.cpp
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPProcessChild.h"
+
+#include "base/command_line.h"
+#include "base/string_util.h"
+#include "mozilla/ipc/IOThreadChild.h"
+#include "mozilla/BackgroundHangMonitor.h"
+
+using mozilla::ipc::IOThreadChild;
+
+namespace mozilla::gmp {
+
+GMPProcessChild::~GMPProcessChild() = default;
+
+bool GMPProcessChild::Init(int aArgc, char* aArgv[]) {
+  nsAutoString pluginFilename;
+
+#if defined(OS_POSIX)
+  // NB: need to be very careful in ensuring that the first arg
+  // (after the binary name) here is indeed the plugin module path.
+  // Keep in sync with dom/plugins/PluginModuleParent.
+  std::vector<std::string> values = CommandLine::ForCurrentProcess()->argv();
+  MOZ_ASSERT(values.size() >= 2, "not enough args");
+  CopyUTF8toUTF16(nsDependentCString(values[1].c_str()), pluginFilename);
+#elif defined(OS_WIN)
+  std::vector<std::wstring> values =
+      CommandLine::ForCurrentProcess()->GetLooseValues();
+  MOZ_ASSERT(values.size() >= 1, "not enough loose args");
+  pluginFilename = nsDependentString(values[0].c_str());
+#else
+#  error Not implemented
+#endif
+
+  BackgroundHangMonitor::Startup();
+
+  return mPlugin.Init(pluginFilename, TakeInitialEndpoint());
+}
+
+void GMPProcessChild::CleanUp() { BackgroundHangMonitor::Shutdown(); }
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPProcessChild.h b/dom/media/gmp/GMPProcessChild.h
new file mode 100644
index 0000000000..019de031f6
--- /dev/null
+++ b/dom/media/gmp/GMPProcessChild.h
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPProcessChild_h_
+#define GMPProcessChild_h_
+
+#include "mozilla/ipc/ProcessChild.h"
+#include "GMPChild.h"
+
+namespace mozilla::gmp {
+
+class GMPLoader;
+
+class GMPProcessChild final : public mozilla::ipc::ProcessChild {
+ protected:
+  typedef mozilla::ipc::ProcessChild ProcessChild;
+
+ public:
+  using ProcessChild::ProcessChild;
+  ~GMPProcessChild();
+
+  bool Init(int aArgc, char* aArgv[]) override;
+  void CleanUp() override;
+
+ private:
+  GMPChild mPlugin;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPProcessChild_h_
diff --git a/dom/media/gmp/GMPProcessParent.cpp b/dom/media/gmp/GMPProcessParent.cpp
new file mode 100644
index 0000000000..735acab033
--- /dev/null
+++ b/dom/media/gmp/GMPProcessParent.cpp
@@ -0,0 +1,280 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=2 et :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPProcessParent.h"
+#include "GMPUtils.h"
+#include "nsIFile.h"
+#include "nsIRunnable.h"
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+#  include "WinUtils.h"
+#endif
+#include "GMPLog.h"
+
+#include "base/string_util.h"
+#include "base/process_util.h"
+
+#include <string>
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+#  include "mozilla/Omnijar.h"
+#  include "mozilla/Preferences.h"
+#  include "mozilla/Sandbox.h"
+#  include "mozilla/SandboxSettings.h"
+#  include "nsMacUtilsImpl.h"
+#endif
+
+using std::string;
+using std::vector;
+
+using mozilla::gmp::GMPProcessParent;
+using mozilla::ipc::GeckoChildProcessHost;
+
+#ifdef MOZ_WIDGET_ANDROID
+static const int kInvalidFd = -1;
+#endif
+
+namespace mozilla::gmp {
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+bool GMPProcessParent::sLaunchWithMacSandbox = true;
+bool GMPProcessParent::sMacSandboxGMPLogging = false;
+#  if defined(DEBUG)
+bool GMPProcessParent::sIsMainThreadInitDone = false;
+#  endif
+#endif
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+/* static */
+void GMPProcessParent::InitStaticMainThread() {
+  // The GMPProcessParent constructor is called off the
+  // main thread. Do main thread initialization here.
+  MOZ_ASSERT(NS_IsMainThread());
+  sMacSandboxGMPLogging =
+      Preferences::GetBool("security.sandbox.logging.enabled") ||
+      PR_GetEnv("MOZ_SANDBOX_GMP_LOGGING") || PR_GetEnv("MOZ_SANDBOX_LOGGING");
+  GMP_LOG_DEBUG("GMPProcessParent::InitStaticMainThread: sandbox logging=%s",
+                sMacSandboxGMPLogging ? "true" : "false");
+#  if defined(DEBUG)
+  sIsMainThreadInitDone = true;
+#  endif
+}
+#endif
+
+GMPProcessParent::GMPProcessParent(const std::string& aGMPPath)
+    : GeckoChildProcessHost(GeckoProcessType_GMPlugin),
+      mGMPPath(aGMPPath)
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+      ,
+      mRequiresWindowServer(false)
+#endif
+#if defined(XP_MACOSX) && defined(__aarch64__)
+      ,
+      mChildLaunchArch(base::PROCESS_ARCH_INVALID)
+#endif
+{
+  MOZ_COUNT_CTOR(GMPProcessParent);
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+  MOZ_ASSERT(sIsMainThreadInitDone == true);
+  mDisableOSActivityMode = sLaunchWithMacSandbox;
+#endif
+}
+
+GMPProcessParent::~GMPProcessParent() { MOZ_COUNT_DTOR(GMPProcessParent); }
+
+bool GMPProcessParent::Launch(int32_t aTimeoutMs) {
+  vector<string> args;
+
+#if defined(XP_MACOSX) && defined(__aarch64__)
+  GMP_LOG_DEBUG("GMPProcessParent::Launch() mChildLaunchArch: %d",
+                mChildLaunchArch);
+  mLaunchOptions->arch = mChildLaunchArch;
+  if (mChildLaunchArch == base::PROCESS_ARCH_X86_64) {
+    mLaunchOptions->env_map["MOZ_SHMEM_PAGESIZE_16K"] = 1;
+  }
+#endif
+
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+  std::wstring wGMPPath = UTF8ToWide(mGMPPath.c_str());
+
+  // The sandbox doesn't allow file system rules where the paths contain
+  // symbolic links or junction points. Sometimes the Users folder has been
+  // moved to another drive using a junction point, so allow for this specific
+  // case. See bug 1236680 for details.
+  if (!widget::WinUtils::ResolveJunctionPointsAndSymLinks(wGMPPath)) {
+    GMP_LOG_DEBUG("ResolveJunctionPointsAndSymLinks failed for GMP path=%S",
+                  wGMPPath.c_str());
+    NS_WARNING("ResolveJunctionPointsAndSymLinks failed for GMP path.");
+    return false;
+  }
+  GMP_LOG_DEBUG("GMPProcessParent::Launch() resolved path to %S",
+                wGMPPath.c_str());
+
+  // If the GMP path is a network path that is not mapped to a drive letter,
+  // then we need to fix the path format for the sandbox rule.
+  wchar_t volPath[MAX_PATH];
+  if (::GetVolumePathNameW(wGMPPath.c_str(), volPath, MAX_PATH) &&
+      ::GetDriveTypeW(volPath) == DRIVE_REMOTE &&
+      wGMPPath.compare(0, 2, L"\\\\") == 0) {
+    std::wstring sandboxGMPPath(wGMPPath);
+    sandboxGMPPath.insert(1, L"??\\UNC");
+    mAllowedFilesRead.push_back(sandboxGMPPath + L"\\*");
+  } else {
+    mAllowedFilesRead.push_back(wGMPPath + L"\\*");
+  }
+
+  args.push_back(WideToUTF8(wGMPPath));
+#elif defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+  // Resolve symlinks in the plugin path. The sandbox prevents
+  // resolving symlinks in the child process if access to link
+  // source file is denied.
+  nsAutoCString normalizedPath;
+  nsresult rv = NormalizePath(mGMPPath.c_str(), normalizedPath);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    GMP_LOG_DEBUG(
+        "GMPProcessParent::Launch: "
+        "plugin path normaliziation failed for path: %s",
+        mGMPPath.c_str());
+    args.push_back(mGMPPath);
+  } else {
+    args.push_back(normalizedPath.get());
+  }
+#else
+  args.push_back(mGMPPath);
+#endif
+
+#ifdef MOZ_WIDGET_ANDROID
+  // Add dummy values for pref and pref map to the file descriptors remapping
+  // table. See bug 1440207 and 1481139.
+  AddFdToRemap(kInvalidFd, kInvalidFd);
+  AddFdToRemap(kInvalidFd, kInvalidFd);
+#endif
+  return SyncLaunch(args, aTimeoutMs);
+}
+
+void GMPProcessParent::Delete(nsCOMPtr<nsIRunnable> aCallback) {
+  mDeletedCallback = aCallback;
+  XRE_GetIOMessageLoop()->PostTask(NewNonOwningRunnableMethod(
+      "gmp::GMPProcessParent::DoDelete", this, &GMPProcessParent::DoDelete));
+}
+
+void GMPProcessParent::DoDelete() {
+  MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
+
+  if (mDeletedCallback) {
+    mDeletedCallback->Run();
+  }
+
+  Destroy();
+}
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+bool GMPProcessParent::IsMacSandboxLaunchEnabled() {
+  return sLaunchWithMacSandbox;
+}
+
+void GMPProcessParent::SetRequiresWindowServer(bool aRequiresWindowServer) {
+  mRequiresWindowServer = aRequiresWindowServer;
+}
+
+bool GMPProcessParent::FillMacSandboxInfo(MacSandboxInfo& aInfo) {
+  aInfo.type = MacSandboxType_GMP;
+  aInfo.hasWindowServer = mRequiresWindowServer;
+  aInfo.shouldLog = (aInfo.shouldLog || sMacSandboxGMPLogging);
+  nsAutoCString appPath;
+  if (!nsMacUtilsImpl::GetAppPath(appPath)) {
+    GMP_LOG_DEBUG(
+        "GMPProcessParent::FillMacSandboxInfo: failed to get app path");
+    return false;
+  }
+  aInfo.appPath.assign(appPath.get());
+
+  GMP_LOG_DEBUG(
+      "GMPProcessParent::FillMacSandboxInfo: "
+      "plugin dir path: %s",
+      mGMPPath.c_str());
+  nsCOMPtr<nsIFile> pluginDir;
+  nsresult rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(mGMPPath.c_str()), true,
+                                getter_AddRefs(pluginDir));
+  if (NS_FAILED(rv)) {
+    GMP_LOG_DEBUG(
+        "GMPProcessParent::FillMacSandboxInfo: "
+        "NS_NewLocalFile failed for plugin dir, rv=%d",
+        rv);
+    return false;
+  }
+
+  rv = pluginDir->Normalize();
+  if (NS_FAILED(rv)) {
+    GMP_LOG_DEBUG(
+        "GMPProcessParent::FillMacSandboxInfo: "
+        "failed to normalize plugin dir path, rv=%d",
+        rv);
+    return false;
+  }
+
+  nsAutoCString resolvedPluginPath;
+  pluginDir->GetNativePath(resolvedPluginPath);
+  aInfo.pluginPath.assign(resolvedPluginPath.get());
+  GMP_LOG_DEBUG(
+      "GMPProcessParent::FillMacSandboxInfo: "
+      "resolved plugin dir path: %s",
+      resolvedPluginPath.get());
+
+  if (mozilla::IsDevelopmentBuild()) {
+    GMP_LOG_DEBUG(
+        "GMPProcessParent::FillMacSandboxInfo: IsDevelopmentBuild()=true");
+
+    // Repo dir
+    nsCOMPtr<nsIFile> repoDir;
+    rv = nsMacUtilsImpl::GetRepoDir(getter_AddRefs(repoDir));
+    if (NS_FAILED(rv)) {
+      GMP_LOG_DEBUG(
+          "GMPProcessParent::FillMacSandboxInfo: failed to get repo dir");
+      return false;
+    }
+    nsCString repoDirPath;
+    Unused << repoDir->GetNativePath(repoDirPath);
+    aInfo.testingReadPath1 = repoDirPath.get();
+    GMP_LOG_DEBUG(
+        "GMPProcessParent::FillMacSandboxInfo: "
+        "repo dir path: %s",
+        repoDirPath.get());
+
+    // Object dir
+    nsCOMPtr<nsIFile> objDir;
+    rv = nsMacUtilsImpl::GetObjDir(getter_AddRefs(objDir));
+    if (NS_FAILED(rv)) {
+      GMP_LOG_DEBUG(
+          "GMPProcessParent::FillMacSandboxInfo: failed to get object dir");
+      return false;
+    }
+    nsCString objDirPath;
+    Unused << objDir->GetNativePath(objDirPath);
+    aInfo.testingReadPath2 = objDirPath.get();
+    GMP_LOG_DEBUG(
+        "GMPProcessParent::FillMacSandboxInfo: "
+        "object dir path: %s",
+        objDirPath.get());
+  }
+  return true;
+}
+
+nsresult GMPProcessParent::NormalizePath(const char* aPath,
+                                         nsACString& aNormalizedPath) {
+  nsCOMPtr<nsIFile> fileOrDir;
+  nsresult rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(aPath), true,
+                                getter_AddRefs(fileOrDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = fileOrDir->Normalize();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  fileOrDir->GetNativePath(aNormalizedPath);
+  return NS_OK;
+}
+#endif
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPProcessParent.h b/dom/media/gmp/GMPProcessParent.h
new file mode 100644
index 0000000000..21201fa6ba
--- /dev/null
+++ b/dom/media/gmp/GMPProcessParent.h
@@ -0,0 +1,110 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPProcessParent_h
+#define GMPProcessParent_h 1
+
+#include "mozilla/Attributes.h"
+#include "base/basictypes.h"
+#include "base/file_path.h"
+#include "base/thread.h"
+#include "chrome/common/child_process_host.h"
+#include "mozilla/ipc/GeckoChildProcessHost.h"
+
+class nsIRunnable;
+
+namespace mozilla::gmp {
+
+class GMPProcessParent final : public mozilla::ipc::GeckoChildProcessHost {
+ public:
+  explicit GMPProcessParent(const std::string& aGMPPath);
+
+  // Synchronously launch the plugin process. If the process fails to launch
+  // after timeoutMs, this method will return false.
+  bool Launch(int32_t aTimeoutMs);
+
+  void Delete(nsCOMPtr<nsIRunnable> aCallback = nullptr);
+
+  bool CanShutdown() override { return true; }
+  const std::string& GetPluginFilePath() { return mGMPPath; }
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+  // Init static members on the main thread
+  static void InitStaticMainThread();
+
+  // Read prefs and environment variables to determine
+  // when and if to start the Mac sandbox for the child
+  // process. Starting the sandbox at launch is the new
+  // preferred method. Code to support starting the sandbox
+  // later at plugin start time should be removed once
+  // starting at launch is stable and shipping.
+  bool IsMacSandboxLaunchEnabled() override;
+
+  // For process sandboxing purposes, set whether or not this
+  // instance of the GMP process requires access to the macOS
+  // window server. At present, Widevine requires window server
+  // access, but OpenH264 decoding does not.
+  void SetRequiresWindowServer(bool aRequiresWindowServer);
+
+  // Return the sandbox type to be used with this process type.
+  static MacSandboxType GetMacSandboxType() { return MacSandboxType_GMP; };
+#endif
+
+#if defined(XP_MACOSX) && defined(__aarch64__)
+  void SetLaunchArchitecture(uint32_t aArch) { mChildLaunchArch = aArch; }
+#endif
+
+  using mozilla::ipc::GeckoChildProcessHost::GetChannel;
+  using mozilla::ipc::GeckoChildProcessHost::GetChildProcessHandle;
+
+ private:
+  ~GMPProcessParent();
+
+  void DoDelete();
+
+  std::string mGMPPath;
+  nsCOMPtr<nsIRunnable> mDeletedCallback;
+
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+  // Indicates whether we'll start the Mac GMP sandbox during
+  // process launch (earlyinit) which is the new preferred method
+  // or later in the process lifetime.
+  static bool sLaunchWithMacSandbox;
+
+  // Whether or not Mac sandbox violation logging is enabled.
+  static bool sMacSandboxGMPLogging;
+
+  // Override so we can set GMP-specific sandbox parameters
+  bool FillMacSandboxInfo(MacSandboxInfo& aInfo) override;
+
+  // For normalizing paths to be compatible with sandboxing.
+  // We use normalized paths to generate the sandbox ruleset. Once
+  // the sandbox has been started, resolving symlinks that point to
+  // allowed directories could require reading paths not allowed by
+  // the sandbox, so we should only attempt to load plugin libraries
+  // using normalized paths.
+  static nsresult NormalizePath(const char* aPath, nsACString& aNormalizedPath);
+
+  // Controls whether or not the sandbox will be configured with
+  // window service access.
+  bool mRequiresWindowServer;
+
+#  if defined(DEBUG)
+  // Used to assert InitStaticMainThread() is called before the constructor.
+  static bool sIsMainThreadInitDone;
+#  endif
+#endif
+
+#if defined(XP_MACOSX) && defined(__aarch64__)
+  uint32_t mChildLaunchArch;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(GMPProcessParent);
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // ifndef GMPProcessParent_h
diff --git a/dom/media/gmp/GMPSanitizedExports.h b/dom/media/gmp/GMPSanitizedExports.h
new file mode 100644
index 0000000000..76c00dba9b
--- /dev/null
+++ b/dom/media/gmp/GMPSanitizedExports.h
@@ -0,0 +1,22 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+// This file exposes symbols from the CDM headers + undefines macros which
+// X11 defines and which clash with the CDM headers.
+//
+// Ideally we can prune where X11 headers are included so that we don't need
+// this, but this band aid is useful until then.
+
+#ifndef DOM_MEDIA_GMP_GMP_API_GMP_SANITIZED_CDM_EXPORTS_H_
+#define DOM_MEDIA_GMP_GMP_API_GMP_SANITIZED_CDM_EXPORTS_H_
+
+// If Status is defined undef it so we don't break the CDM headers.
+#ifdef Status
+#  undef Status
+#endif  // Status
+#include "content_decryption_module.h"
+
+#endif  // DOM_MEDIA_GMP_GMP_API_GMP_SANITIZED_CDM_EXPORTS_H_
diff --git a/dom/media/gmp/GMPService.cpp b/dom/media/gmp/GMPService.cpp
new file mode 100644
index 0000000000..24633a2686
--- /dev/null
+++ b/dom/media/gmp/GMPService.cpp
@@ -0,0 +1,536 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPService.h"
+
+#include "ChromiumCDMParent.h"
+#include "GMPLog.h"
+#include "GMPParent.h"
+#include "GMPProcessParent.h"
+#include "GMPServiceChild.h"
+#include "GMPServiceParent.h"
+#include "GMPVideoDecoderParent.h"
+#include "mozilla/ipc/GeckoChildProcessHost.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/PluginCrashedEvent.h"
+#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+#  include "mozilla/SandboxInfo.h"
+#endif
+#include "VideoUtils.h"
+#include "mozilla/Services.h"
+#include "mozilla/SyncRunnable.h"
+#include "mozilla/Unused.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsComponentManagerUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsHashKeys.h"
+#include "nsIObserverService.h"
+#include "nsIXULAppInfo.h"
+#include "nsNativeCharsetUtils.h"
+#include "nsXPCOMPrivate.h"
+#include "prio.h"
+#include "runnable_utils.h"
+
+namespace mozilla {
+
+LogModule* GetGMPLog() {
+  static LazyLogModule sLog("GMP");
+  return sLog;
+}
+
+#ifdef __CLASS__
+#  undef __CLASS__
+#endif
+#define __CLASS__ "GMPService"
+
+namespace gmp {
+
+static StaticRefPtr<GeckoMediaPluginService> sSingletonService;
+
+class GMPServiceCreateHelper final : public mozilla::Runnable {
+  RefPtr<GeckoMediaPluginService> mService;
+
+ public:
+  static already_AddRefed<GeckoMediaPluginService> GetOrCreate() {
+    RefPtr<GeckoMediaPluginService> service;
+
+    if (NS_IsMainThread()) {
+      service = GetOrCreateOnMainThread();
+    } else {
+      RefPtr<GMPServiceCreateHelper> createHelper =
+          new GMPServiceCreateHelper();
+
+      mozilla::SyncRunnable::DispatchToThread(GetMainThreadSerialEventTarget(),
+                                              createHelper, true);
+
+      service = std::move(createHelper->mService);
+    }
+
+    return service.forget();
+  }
+
+ private:
+  GMPServiceCreateHelper() : Runnable("GMPServiceCreateHelper") {}
+
+  ~GMPServiceCreateHelper() { MOZ_ASSERT(!mService); }
+
+  static already_AddRefed<GeckoMediaPluginService> GetOrCreateOnMainThread() {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    if (!sSingletonService) {
+      if (XRE_IsParentProcess()) {
+        RefPtr<GeckoMediaPluginServiceParent> service =
+            new GeckoMediaPluginServiceParent();
+        service->Init();
+        sSingletonService = service;
+#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
+        // GMPProcessParent should only be instantiated in the parent
+        // so initialization only needs to be done in the parent.
+        GMPProcessParent::InitStaticMainThread();
+#endif
+      } else {
+        RefPtr<GeckoMediaPluginServiceChild> service =
+            new GeckoMediaPluginServiceChild();
+        service->Init();
+        sSingletonService = service;
+      }
+      ClearOnShutdown(&sSingletonService);
+    }
+
+    RefPtr<GeckoMediaPluginService> service = sSingletonService.get();
+    return service.forget();
+  }
+
+  NS_IMETHOD
+  Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    mService = GetOrCreateOnMainThread();
+    return NS_OK;
+  }
+};
+
+already_AddRefed<GeckoMediaPluginService>
+GeckoMediaPluginService::GetGeckoMediaPluginService() {
+  return GMPServiceCreateHelper::GetOrCreate();
+}
+
+NS_IMPL_ISUPPORTS(GeckoMediaPluginService, mozIGeckoMediaPluginService,
+                  nsIObserver)
+
+GeckoMediaPluginService::GeckoMediaPluginService()
+    : mMutex("GeckoMediaPluginService::mMutex"),
+      mMainThread(GetMainThreadSerialEventTarget()),
+      mGMPThreadShutdown(false),
+      mShuttingDownOnGMPThread(false),
+      mXPCOMWillShutdown(false) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIXULAppInfo> appInfo =
+      do_GetService("@mozilla.org/xre/app-info;1");
+  if (appInfo) {
+    nsAutoCString version;
+    nsAutoCString buildID;
+    if (NS_SUCCEEDED(appInfo->GetVersion(version)) &&
+        NS_SUCCEEDED(appInfo->GetAppBuildID(buildID))) {
+      GMP_LOG_DEBUG(
+          "GeckoMediaPluginService created; Gecko version=%s buildID=%s",
+          version.get(), buildID.get());
+    }
+  }
+}
+
+GeckoMediaPluginService::~GeckoMediaPluginService() = default;
+
+NS_IMETHODIMP
+GeckoMediaPluginService::RunPluginCrashCallbacks(
+    uint32_t aPluginId, const nsACString& aPluginName) {
+  MOZ_ASSERT(NS_IsMainThread());
+  GMP_LOG_DEBUG("%s::%s(%i)", __CLASS__, __FUNCTION__, aPluginId);
+
+  mozilla::UniquePtr<nsTArray<RefPtr<GMPCrashHelper>>> helpers;
+  {
+    MutexAutoLock lock(mMutex);
+    mPluginCrashHelpers.Remove(aPluginId, &helpers);
+  }
+  if (!helpers) {
+    GMP_LOG_DEBUG("%s::%s(%i) No crash helpers, not handling crash.", __CLASS__,
+                  __FUNCTION__, aPluginId);
+    return NS_OK;
+  }
+
+  for (const auto& helper : *helpers) {
+    nsCOMPtr<nsPIDOMWindowInner> window = helper->GetPluginCrashedEventTarget();
+    if (NS_WARN_IF(!window)) {
+      continue;
+    }
+    RefPtr<dom::Document> document(window->GetExtantDoc());
+    if (NS_WARN_IF(!document)) {
+      continue;
+    }
+
+    dom::PluginCrashedEventInit init;
+    init.mPluginID = aPluginId;
+    init.mBubbles = true;
+    init.mCancelable = true;
+    init.mGmpPlugin = true;
+    CopyUTF8toUTF16(aPluginName, init.mPluginName);
+    init.mSubmittedCrashReport = false;
+    RefPtr<dom::PluginCrashedEvent> event =
+        dom::PluginCrashedEvent::Constructor(document, u"PluginCrashed"_ns,
+                                             init);
+    event->SetTrusted(true);
+    event->WidgetEventPtr()->mFlags.mOnlyChromeDispatch = true;
+
+    EventDispatcher::DispatchDOMEvent(window, nullptr, event, nullptr, nullptr);
+  }
+
+  return NS_OK;
+}
+
+nsresult GeckoMediaPluginService::Init() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIObserverService> obsService =
+      mozilla::services::GetObserverService();
+  MOZ_ASSERT(obsService);
+  MOZ_ALWAYS_SUCCEEDS(obsService->AddObserver(
+      this, NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, false));
+
+  // Kick off scanning for plugins
+  nsCOMPtr<nsIThread> thread;
+  return GetThread(getter_AddRefs(thread));
+}
+
+RefPtr<GetCDMParentPromise> GeckoMediaPluginService::GetCDM(
+    const NodeIdParts& aNodeIdParts, const nsACString& aKeySystem,
+    GMPCrashHelper* aHelper) {
+  AssertOnGMPThread();
+
+  if (mShuttingDownOnGMPThread || aKeySystem.IsEmpty()) {
+    nsPrintfCString reason(
+        "%s::%s failed, aKeySystem.IsEmpty() = %d, mShuttingDownOnGMPThread = "
+        "%d.",
+        __CLASS__, __FUNCTION__, aKeySystem.IsEmpty(),
+        mShuttingDownOnGMPThread);
+    return GetCDMParentPromise::CreateAndReject(
+        MediaResult(NS_ERROR_FAILURE, reason.get()), __func__);
+  }
+
+  typedef MozPromiseHolder<GetCDMParentPromise> PromiseHolder;
+  PromiseHolder* rawHolder(new PromiseHolder());
+  RefPtr<GetCDMParentPromise> promise = rawHolder->Ensure(__func__);
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  RefPtr<GMPCrashHelper> helper(aHelper);
+  nsTArray<nsCString> tags{nsCString{aKeySystem}};
+  GetContentParent(aHelper, NodeIdVariant{aNodeIdParts},
+                   nsLiteralCString(CHROMIUM_CDM_API), tags)
+      ->Then(
+          thread, __func__,
+          [rawHolder, helper, keySystem = nsCString{aKeySystem}](
+              RefPtr<GMPContentParent::CloseBlocker> wrapper) {
+            RefPtr<GMPContentParent> parent = wrapper->mParent;
+            MOZ_ASSERT(
+                parent,
+                "Wrapper should wrap a valid parent if we're in this path.");
+            UniquePtr<PromiseHolder> holder(rawHolder);
+            RefPtr<ChromiumCDMParent> cdm = parent->GetChromiumCDM(keySystem);
+            if (!cdm) {
+              nsPrintfCString reason(
+                  "%s::%s failed since GetChromiumCDM returns nullptr.",
+                  __CLASS__, __FUNCTION__);
+              holder->Reject(MediaResult(NS_ERROR_FAILURE, reason.get()),
+                             __func__);
+              return;
+            }
+            if (helper) {
+              cdm->SetCrashHelper(helper);
+            }
+            holder->Resolve(cdm, __func__);
+          },
+          [rawHolder](MediaResult result) {
+            nsPrintfCString reason(
+                "%s::%s failed since GetContentParent rejects the promise with "
+                "reason %s.",
+                __CLASS__, __FUNCTION__, result.Description().get());
+            UniquePtr<PromiseHolder> holder(rawHolder);
+            holder->Reject(MediaResult(NS_ERROR_FAILURE, reason.get()),
+                           __func__);
+          });
+
+  return promise;
+}
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+RefPtr<GetGMPContentParentPromise>
+GeckoMediaPluginService::GetContentParentForTest() {
+  AssertOnGMPThread();
+
+  nsTArray<nsCString> tags;
+  tags.AppendElement("fake"_ns);
+
+  const nsString origin1 = u"http://example1.com"_ns;
+  const nsString origin2 = u"http://example2.org"_ns;
+  const nsString gmpName = u"gmp-fake"_ns;
+
+  NodeIdParts nodeIdParts = NodeIdParts{origin1, origin2, gmpName};
+
+  if (mShuttingDownOnGMPThread) {
+    nsPrintfCString reason("%s::%s failed, mShuttingDownOnGMPThread = %d.",
+                           __CLASS__, __FUNCTION__, mShuttingDownOnGMPThread);
+    return GetGMPContentParentPromise::CreateAndReject(
+        MediaResult(NS_ERROR_FAILURE, reason.get()), __func__);
+  }
+
+  using PromiseHolder = MozPromiseHolder<GetGMPContentParentPromise>;
+  PromiseHolder* rawHolder(new PromiseHolder());
+  RefPtr<GetGMPContentParentPromise> promise = rawHolder->Ensure(__func__);
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  GetContentParent(nullptr, NodeIdVariant{nodeIdParts},
+                   nsLiteralCString(CHROMIUM_CDM_API), tags)
+      ->Then(
+          thread, __func__,
+          [rawHolder](const RefPtr<GMPContentParent::CloseBlocker>& wrapper) {
+            RefPtr<GMPContentParent> parent = wrapper->mParent;
+            MOZ_ASSERT(
+                parent,
+                "Wrapper should wrap a valid parent if we're in this path.");
+            UniquePtr<PromiseHolder> holder(rawHolder);
+            if (!parent) {
+              nsPrintfCString reason("%s::%s failed since no GMPContentParent.",
+                                     __CLASS__, __FUNCTION__);
+              holder->Reject(MediaResult(NS_ERROR_FAILURE, reason.get()),
+                             __func__);
+              return;
+            }
+            holder->Resolve(wrapper, __func__);
+          },
+          [rawHolder](const MediaResult& result) {
+            nsPrintfCString reason(
+                "%s::%s failed since GetContentParent rejects the promise with "
+                "reason %s.",
+                __CLASS__, __FUNCTION__, result.Description().get());
+            UniquePtr<PromiseHolder> holder(rawHolder);
+            holder->Reject(MediaResult(NS_ERROR_FAILURE, reason.get()),
+                           __func__);
+          });
+
+  return promise;
+}
+#endif
+
+void GeckoMediaPluginService::ShutdownGMPThread() {
+  GMP_LOG_DEBUG("%s::%s", __CLASS__, __FUNCTION__);
+  nsCOMPtr<nsIThread> gmpThread;
+  {
+    MutexAutoLock lock(mMutex);
+    mGMPThreadShutdown = true;
+    mGMPThread.swap(gmpThread);
+  }
+
+  if (gmpThread) {
+    gmpThread->Shutdown();
+  }
+}
+
+/* static */
+nsCOMPtr<nsIAsyncShutdownClient> GeckoMediaPluginService::GetShutdownBarrier() {
+  nsCOMPtr<nsIAsyncShutdownService> svc = services::GetAsyncShutdownService();
+  MOZ_RELEASE_ASSERT(svc);
+
+  nsCOMPtr<nsIAsyncShutdownClient> barrier;
+  nsresult rv = svc->GetXpcomWillShutdown(getter_AddRefs(barrier));
+
+  MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
+  MOZ_RELEASE_ASSERT(barrier);
+  return barrier;
+}
+
+nsresult GeckoMediaPluginService::GMPDispatch(nsIRunnable* event,
+                                              uint32_t flags) {
+  nsCOMPtr<nsIRunnable> r(event);
+  return GMPDispatch(r.forget());
+}
+
+nsresult GeckoMediaPluginService::GMPDispatch(
+    already_AddRefed<nsIRunnable> event, uint32_t flags) {
+  nsCOMPtr<nsIRunnable> r(event);
+  nsCOMPtr<nsIThread> thread;
+  nsresult rv = GetThread(getter_AddRefs(thread));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  return thread->Dispatch(r, flags);
+}
+
+// always call with getter_AddRefs, because it does
+NS_IMETHODIMP
+GeckoMediaPluginService::GetThread(nsIThread** aThread) {
+  MOZ_ASSERT(aThread);
+
+  // This can be called from any thread.
+  MutexAutoLock lock(mMutex);
+
+  return GetThreadLocked(aThread);
+}
+
+// always call with getter_AddRefs, because it does
+nsresult GeckoMediaPluginService::GetThreadLocked(nsIThread** aThread) {
+  MOZ_ASSERT(aThread);
+
+  mMutex.AssertCurrentThreadOwns();
+
+  if (!mGMPThread) {
+    // Don't allow the thread to be created after shutdown has started.
+    if (mGMPThreadShutdown) {
+      return NS_ERROR_FAILURE;
+    }
+
+    nsresult rv = NS_NewNamedThread("GMPThread", getter_AddRefs(mGMPThread));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    // Tell the thread to initialize plugins
+    InitializePlugins(mGMPThread);
+  }
+
+  nsCOMPtr<nsIThread> copy = mGMPThread;
+  copy.forget(aThread);
+
+  return NS_OK;
+}
+
+already_AddRefed<nsISerialEventTarget> GeckoMediaPluginService::GetGMPThread() {
+  nsCOMPtr<nsISerialEventTarget> thread;
+  {
+    MutexAutoLock lock(mMutex);
+    thread = mGMPThread;
+  }
+  return thread.forget();
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginService::GetGMPVideoDecoder(
+    GMPCrashHelper* aHelper, nsTArray<nsCString>* aTags,
+    const nsACString& aNodeId,
+    UniquePtr<GetGMPVideoDecoderCallback>&& aCallback) {
+  AssertOnGMPThread();
+  NS_ENSURE_ARG(aTags && aTags->Length() > 0);
+  NS_ENSURE_ARG(aCallback);
+
+  if (mShuttingDownOnGMPThread) {
+    return NS_ERROR_FAILURE;
+  }
+
+  GetGMPVideoDecoderCallback* rawCallback = aCallback.release();
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  RefPtr<GMPCrashHelper> helper(aHelper);
+  GetContentParent(aHelper, NodeIdVariant{nsCString(aNodeId)},
+                   nsLiteralCString(GMP_API_VIDEO_DECODER), *aTags)
+      ->Then(
+          thread, __func__,
+          [rawCallback,
+           helper](RefPtr<GMPContentParent::CloseBlocker> wrapper) {
+            RefPtr<GMPContentParent> parent = wrapper->mParent;
+            UniquePtr<GetGMPVideoDecoderCallback> callback(rawCallback);
+            GMPVideoDecoderParent* actor = nullptr;
+            GMPVideoHostImpl* host = nullptr;
+            if (parent && NS_SUCCEEDED(parent->GetGMPVideoDecoder(&actor))) {
+              host = &(actor->Host());
+              actor->SetCrashHelper(helper);
+            }
+            callback->Done(actor, host);
+          },
+          [rawCallback] {
+            UniquePtr<GetGMPVideoDecoderCallback> callback(rawCallback);
+            callback->Done(nullptr, nullptr);
+          });
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginService::GetGMPVideoEncoder(
+    GMPCrashHelper* aHelper, nsTArray<nsCString>* aTags,
+    const nsACString& aNodeId,
+    UniquePtr<GetGMPVideoEncoderCallback>&& aCallback) {
+  AssertOnGMPThread();
+  NS_ENSURE_ARG(aTags && aTags->Length() > 0);
+  NS_ENSURE_ARG(aCallback);
+
+  if (mShuttingDownOnGMPThread) {
+    return NS_ERROR_FAILURE;
+  }
+
+  GetGMPVideoEncoderCallback* rawCallback = aCallback.release();
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  RefPtr<GMPCrashHelper> helper(aHelper);
+  GetContentParent(aHelper, NodeIdVariant{nsCString(aNodeId)},
+                   nsLiteralCString(GMP_API_VIDEO_ENCODER), *aTags)
+      ->Then(
+          thread, __func__,
+          [rawCallback,
+           helper](RefPtr<GMPContentParent::CloseBlocker> wrapper) {
+            RefPtr<GMPContentParent> parent = wrapper->mParent;
+            UniquePtr<GetGMPVideoEncoderCallback> callback(rawCallback);
+            GMPVideoEncoderParent* actor = nullptr;
+            GMPVideoHostImpl* host = nullptr;
+            if (parent && NS_SUCCEEDED(parent->GetGMPVideoEncoder(&actor))) {
+              host = &(actor->Host());
+              actor->SetCrashHelper(helper);
+            }
+            callback->Done(actor, host);
+          },
+          [rawCallback] {
+            UniquePtr<GetGMPVideoEncoderCallback> callback(rawCallback);
+            callback->Done(nullptr, nullptr);
+          });
+
+  return NS_OK;
+}
+
+void GeckoMediaPluginService::ConnectCrashHelper(uint32_t aPluginId,
+                                                 GMPCrashHelper* aHelper) {
+  if (!aHelper) {
+    return;
+  }
+
+  MutexAutoLock lock(mMutex);
+  mPluginCrashHelpers.WithEntryHandle(aPluginId, [&](auto&& entry) {
+    if (!entry) {
+      entry.Insert(MakeUnique<nsTArray<RefPtr<GMPCrashHelper>>>());
+    } else if (entry.Data()->Contains(aHelper)) {
+      return;
+    }
+    entry.Data()->AppendElement(aHelper);
+  });
+}
+
+void GeckoMediaPluginService::DisconnectCrashHelper(GMPCrashHelper* aHelper) {
+  if (!aHelper) {
+    return;
+  }
+  MutexAutoLock lock(mMutex);
+  for (auto iter = mPluginCrashHelpers.Iter(); !iter.Done(); iter.Next()) {
+    nsTArray<RefPtr<GMPCrashHelper>>* helpers = iter.UserData();
+    if (!helpers->Contains(aHelper)) {
+      continue;
+    }
+    helpers->RemoveElement(aHelper);
+    MOZ_ASSERT(!helpers->Contains(aHelper));  // Ensure there aren't duplicates.
+    if (helpers->IsEmpty()) {
+      iter.Remove();
+    }
+  }
+}
+
+}  // namespace gmp
+}  // namespace mozilla
+
+#undef __CLASS__
diff --git a/dom/media/gmp/GMPService.h b/dom/media/gmp/GMPService.h
new file mode 100644
index 0000000000..4633677c6d
--- /dev/null
+++ b/dom/media/gmp/GMPService.h
@@ -0,0 +1,127 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPService_h_
+#define GMPService_h_
+
+#include "GMPContentParent.h"
+#include "GMPCrashHelper.h"
+#include "mozIGeckoMediaPluginService.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/gmp/GMPTypes.h"
+#include "mozilla/MozPromise.h"
+#include "nsCOMPtr.h"
+#include "nsClassHashtable.h"
+#include "nsIObserver.h"
+#include "nsString.h"
+#include "nsTArray.h"
+
+class nsIAsyncShutdownClient;
+class nsIRunnable;
+class nsISerialEventTarget;
+class nsIThread;
+
+template <class>
+struct already_AddRefed;
+
+namespace mozilla {
+
+class GMPCrashHelper;
+class MediaResult;
+
+extern LogModule* GetGMPLog();
+
+namespace gmp {
+
+typedef MozPromise<RefPtr<GMPContentParent::CloseBlocker>, MediaResult,
+                   /* IsExclusive = */ true>
+    GetGMPContentParentPromise;
+typedef MozPromise<RefPtr<ChromiumCDMParent>, MediaResult,
+                   /* IsExclusive = */ true>
+    GetCDMParentPromise;
+
+class GeckoMediaPluginService : public mozIGeckoMediaPluginService,
+                                public nsIObserver {
+ public:
+  static already_AddRefed<GeckoMediaPluginService> GetGeckoMediaPluginService();
+
+  virtual nsresult Init();
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  RefPtr<GetCDMParentPromise> GetCDM(const NodeIdParts& aNodeIdParts,
+                                     const nsACString& aKeySystem,
+                                     GMPCrashHelper* aHelper);
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+  RefPtr<GetGMPContentParentPromise> GetContentParentForTest();
+#endif
+
+  // mozIGeckoMediaPluginService
+  NS_IMETHOD GetThread(nsIThread** aThread) override;
+  nsresult GetThreadLocked(nsIThread** aThread);
+  NS_IMETHOD GetGMPVideoDecoder(
+      GMPCrashHelper* aHelper, nsTArray<nsCString>* aTags,
+      const nsACString& aNodeId,
+      UniquePtr<GetGMPVideoDecoderCallback>&& aCallback) override;
+  NS_IMETHOD GetGMPVideoEncoder(
+      GMPCrashHelper* aHelper, nsTArray<nsCString>* aTags,
+      const nsACString& aNodeId,
+      UniquePtr<GetGMPVideoEncoderCallback>&& aCallback) override;
+
+  // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD RunPluginCrashCallbacks(
+      uint32_t aPluginId, const nsACString& aPluginName) override;
+
+  already_AddRefed<nsISerialEventTarget> GetGMPThread();
+
+  void ConnectCrashHelper(uint32_t aPluginId, GMPCrashHelper* aHelper);
+  void DisconnectCrashHelper(GMPCrashHelper* aHelper);
+
+  bool XPCOMWillShutdownReceived() const { return mXPCOMWillShutdown; }
+
+ protected:
+  GeckoMediaPluginService();
+  virtual ~GeckoMediaPluginService();
+
+  void AssertOnGMPThread() {
+#ifdef DEBUG
+    MutexAutoLock lock(mMutex);
+    MOZ_ASSERT(mGMPThread->IsOnCurrentThread());
+#endif
+  }
+
+  virtual void InitializePlugins(nsISerialEventTarget* aGMPThread) = 0;
+
+  virtual RefPtr<GetGMPContentParentPromise> GetContentParent(
+      GMPCrashHelper* aHelper, const NodeIdVariant& aNodeIdVariant,
+      const nsACString& aAPI, const nsTArray<nsCString>& aTags) = 0;
+
+  nsresult GMPDispatch(nsIRunnable* event, uint32_t flags = NS_DISPATCH_NORMAL);
+  nsresult GMPDispatch(already_AddRefed<nsIRunnable> event,
+                       uint32_t flags = NS_DISPATCH_NORMAL);
+  void ShutdownGMPThread();
+
+  static nsCOMPtr<nsIAsyncShutdownClient> GetShutdownBarrier();
+
+  Mutex mMutex MOZ_UNANNOTATED;  // Protects mGMPThread, mPluginCrashHelpers,
+                                 // mGMPThreadShutdown and some members in
+                                 // derived classes.
+
+  const nsCOMPtr<nsISerialEventTarget> mMainThread;
+
+  nsCOMPtr<nsIThread> mGMPThread;
+  bool mGMPThreadShutdown;
+  bool mShuttingDownOnGMPThread;
+  Atomic<bool> mXPCOMWillShutdown;
+
+  nsClassHashtable<nsUint32HashKey, nsTArray<RefPtr<GMPCrashHelper>>>
+      mPluginCrashHelpers;
+};
+
+}  // namespace gmp
+}  // namespace mozilla
+
+#endif  // GMPService_h_
diff --git a/dom/media/gmp/GMPServiceChild.cpp b/dom/media/gmp/GMPServiceChild.cpp
new file mode 100644
index 0000000000..e3b1f00727
--- /dev/null
+++ b/dom/media/gmp/GMPServiceChild.cpp
@@ -0,0 +1,569 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPServiceChild.h"
+
+#include "GMPContentParent.h"
+#include "GMPLog.h"
+#include "GMPParent.h"
+#include "base/task.h"
+#include "mozIGeckoMediaPluginChromeService.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/StaticMutex.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/SyncRunnable.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "nsCOMPtr.h"
+#include "nsComponentManagerUtils.h"
+#include "nsIObserverService.h"
+#include "nsReadableUtils.h"
+#include "nsXPCOMPrivate.h"
+#include "runnable_utils.h"
+
+namespace mozilla::gmp {
+
+#ifdef __CLASS__
+#  undef __CLASS__
+#endif
+#define __CLASS__ "GMPServiceChild"
+
+already_AddRefed<GeckoMediaPluginServiceChild>
+GeckoMediaPluginServiceChild::GetSingleton() {
+  MOZ_ASSERT(!XRE_IsParentProcess());
+  RefPtr<GeckoMediaPluginService> service(
+      GeckoMediaPluginService::GetGeckoMediaPluginService());
+#ifdef DEBUG
+  if (service) {
+    nsCOMPtr<mozIGeckoMediaPluginChromeService> chromeService;
+    CallQueryInterface(service.get(), getter_AddRefs(chromeService));
+    MOZ_ASSERT(!chromeService);
+  }
+#endif
+  return service.forget().downcast<GeckoMediaPluginServiceChild>();
+}
+
+nsresult GeckoMediaPluginServiceChild::Init() {
+  MOZ_ASSERT(NS_IsMainThread());
+  GMP_LOG_DEBUG("%s::%s", __CLASS__, __FUNCTION__);
+
+  nsresult rv = AddShutdownBlocker();
+  if (NS_FAILED(rv)) {
+    MOZ_ASSERT_UNREACHABLE(
+        "We expect xpcom to be live when calling this, so we should be able to "
+        "add a blocker");
+    GMP_LOG_DEBUG("%s::%s failed to add shutdown blocker!", __CLASS__,
+                  __FUNCTION__);
+    return rv;
+  }
+
+  return GeckoMediaPluginService::Init();
+}
+
+NS_IMPL_ISUPPORTS_INHERITED(GeckoMediaPluginServiceChild,
+                            GeckoMediaPluginService, nsIAsyncShutdownBlocker)
+
+// Used to identify blockers that we put in place.
+static const nsLiteralString kShutdownBlockerName =
+    u"GeckoMediaPluginServiceChild: shutdown"_ns;
+
+// nsIAsyncShutdownBlocker members
+NS_IMETHODIMP
+GeckoMediaPluginServiceChild::GetName(nsAString& aName) {
+  aName = kShutdownBlockerName;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceChild::GetState(nsIPropertyBag**) { return NS_OK; }
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceChild::BlockShutdown(nsIAsyncShutdownClient*) {
+  MOZ_ASSERT(NS_IsMainThread());
+  GMP_LOG_DEBUG("%s::%s", __CLASS__, __FUNCTION__);
+
+  mXPCOMWillShutdown = true;
+
+  MutexAutoLock lock(mMutex);
+  Unused << NS_WARN_IF(NS_FAILED(mGMPThread->Dispatch(
+      NewRunnableMethod("GeckoMediaPluginServiceChild::BeginShutdown", this,
+                        &GeckoMediaPluginServiceChild::BeginShutdown))));
+  return NS_OK;
+}
+// End nsIAsyncShutdownBlocker members
+
+GeckoMediaPluginServiceChild::~GeckoMediaPluginServiceChild() {
+  MOZ_ASSERT(!mServiceChild);
+}
+
+RefPtr<GetGMPContentParentPromise>
+GeckoMediaPluginServiceChild::GetContentParent(
+    GMPCrashHelper* aHelper, const NodeIdVariant& aNodeIdVariant,
+    const nsACString& aAPI, const nsTArray<nsCString>& aTags) {
+  AssertOnGMPThread();
+  MOZ_ASSERT(!mShuttingDownOnGMPThread,
+             "Should not be called if GMPThread is shutting down!");
+
+  MozPromiseHolder<GetGMPContentParentPromise>* rawHolder =
+      new MozPromiseHolder<GetGMPContentParentPromise>();
+  RefPtr<GetGMPContentParentPromise> promise = rawHolder->Ensure(__func__);
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+
+  nsCString api(aAPI);
+  RefPtr<GMPCrashHelper> helper(aHelper);
+  RefPtr<GeckoMediaPluginServiceChild> self(this);
+
+  mPendingGetContentParents += 1;
+
+  GetServiceChild()->Then(
+      thread, __func__,
+      [nodeIdVariant = aNodeIdVariant, self, api, tags = aTags.Clone(), helper,
+       rawHolder](GMPServiceChild* child) {
+        UniquePtr<MozPromiseHolder<GetGMPContentParentPromise>> holder(
+            rawHolder);
+        nsresult rv;
+
+        nsTArray<base::ProcessId> alreadyBridgedTo;
+        child->GetAlreadyBridgedTo(alreadyBridgedTo);
+
+        base::ProcessId otherProcess;
+        nsCString displayName;
+        uint32_t pluginId = 0;
+        ipc::Endpoint<PGMPContentParent> endpoint;
+        nsCString errorDescription;
+
+        bool ok = child->SendLaunchGMP(
+            nodeIdVariant, api, tags, alreadyBridgedTo, &pluginId,
+            &otherProcess, &displayName, &endpoint, &rv, &errorDescription);
+
+        if (helper && pluginId) {
+          // Note: Even if the launch failed, we need to connect the crash
+          // helper so that if the launch failed due to the plugin crashing, we
+          // can report the crash via the crash reporter. The crash handling
+          // notification will arrive shortly if the launch failed due to the
+          // plugin crashing.
+          self->ConnectCrashHelper(pluginId, helper);
+        }
+
+        if (!ok || NS_FAILED(rv)) {
+          MediaResult error(
+              rv, nsPrintfCString(
+                      "GeckoMediaPluginServiceChild::GetContentParent "
+                      "SendLaunchGMPForNodeId failed with description (%s)",
+                      errorDescription.get()));
+
+          GMP_LOG_DEBUG("%s failed to launch GMP with error: %s", __CLASS__,
+                        error.Description().get());
+          self->mPendingGetContentParents -= 1;
+          self->RemoveShutdownBlockerIfNeeded();
+
+          holder->Reject(error, __func__);
+          return;
+        }
+
+        RefPtr<GMPContentParent> parent = child->GetBridgedGMPContentParent(
+            otherProcess, std::move(endpoint));
+        if (!alreadyBridgedTo.Contains(otherProcess)) {
+          parent->SetDisplayName(displayName);
+          parent->SetPluginId(pluginId);
+        }
+
+        // The content parent is no longer pending.
+        self->mPendingGetContentParents -= 1;
+        MOZ_ASSERT(child->HaveContentParents(),
+                   "We should have at least one content parent!");
+        // We don't check if we need to remove the shutdown blocker here as
+        // we should always have at least one live content parent.
+
+        RefPtr<GMPContentParent::CloseBlocker> blocker(
+            new GMPContentParent::CloseBlocker(parent));
+        holder->Resolve(blocker, __func__);
+      },
+      [self, rawHolder](MediaResult result) {
+        self->mPendingGetContentParents -= 1;
+        self->RemoveShutdownBlockerIfNeeded();
+        UniquePtr<MozPromiseHolder<GetGMPContentParentPromise>> holder(
+            rawHolder);
+        holder->Reject(result, __func__);
+      });
+
+  return promise;
+}
+
+typedef mozilla::dom::GMPCapabilityData GMPCapabilityData;
+typedef mozilla::dom::GMPAPITags GMPAPITags;
+
+struct GMPCapabilityAndVersion {
+  explicit GMPCapabilityAndVersion(const GMPCapabilityData& aCapabilities)
+      : mName(aCapabilities.name()), mVersion(aCapabilities.version()) {
+    for (const GMPAPITags& tags : aCapabilities.capabilities()) {
+      GMPCapability cap;
+      cap.mAPIName = tags.api();
+      for (const nsACString& tag : tags.tags()) {
+        cap.mAPITags.AppendElement(tag);
+      }
+      mCapabilities.AppendElement(std::move(cap));
+    }
+  }
+
+  nsCString ToString() const {
+    nsCString s;
+    s.Append(mName);
+    s.AppendLiteral(" version=");
+    s.Append(mVersion);
+    s.AppendLiteral(" tags=[");
+    StringJoinAppend(s, " "_ns, mCapabilities,
+                     [](auto& tags, const GMPCapability& cap) {
+                       tags.Append(cap.mAPIName);
+                       for (const nsACString& tag : cap.mAPITags) {
+                         tags.AppendLiteral(":");
+                         tags.Append(tag);
+                       }
+                     });
+    s.AppendLiteral("]");
+    return s;
+  }
+
+  nsCString mName;
+  nsCString mVersion;
+  nsTArray<GMPCapability> mCapabilities;
+};
+
+StaticMutex sGMPCapabilitiesMutex;
+StaticAutoPtr<nsTArray<GMPCapabilityAndVersion>> sGMPCapabilities;
+
+static auto GMPCapabilitiesToString() {
+  return StringJoin(", "_ns, *sGMPCapabilities,
+                    [](nsACString& dest, const GMPCapabilityAndVersion& gmp) {
+                      dest.Append(gmp.ToString());
+                    });
+}
+
+/* static */
+void GeckoMediaPluginServiceChild::UpdateGMPCapabilities(
+    nsTArray<GMPCapabilityData>&& aCapabilities) {
+  {
+    // The mutex should unlock before sending the "gmp-changed" observer
+    // service notification.
+    StaticMutexAutoLock lock(sGMPCapabilitiesMutex);
+    if (!sGMPCapabilities) {
+      sGMPCapabilities = new nsTArray<GMPCapabilityAndVersion>();
+      ClearOnShutdown(&sGMPCapabilities);
+    }
+    sGMPCapabilities->Clear();
+    for (const GMPCapabilityData& plugin : aCapabilities) {
+      sGMPCapabilities->AppendElement(GMPCapabilityAndVersion(plugin));
+    }
+
+    GMP_LOG_DEBUG("%s::%s {%s}", __CLASS__, __FUNCTION__,
+                  GMPCapabilitiesToString().get());
+  }
+
+  // Fire a notification so that any MediaKeySystemAccess
+  // requests waiting on a CDM to download will retry.
+  nsCOMPtr<nsIObserverService> obsService =
+      mozilla::services::GetObserverService();
+  MOZ_ASSERT(obsService);
+  if (obsService) {
+    obsService->NotifyObservers(nullptr, "gmp-changed", nullptr);
+  }
+}
+
+void GeckoMediaPluginServiceChild::BeginShutdown() {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG("%s::%s: mServiceChild=%p,", __CLASS__, __FUNCTION__,
+                mServiceChild.get());
+  // It's possible this gets called twice if the parent sends us a message to
+  // shutdown and we block shutdown in content in close proximity.
+  mShuttingDownOnGMPThread = true;
+  RemoveShutdownBlockerIfNeeded();
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceChild::HasPluginForAPI(const nsACString& aAPI,
+                                              nsTArray<nsCString>* aTags,
+                                              bool* aHasPlugin) {
+  StaticMutexAutoLock lock(sGMPCapabilitiesMutex);
+  if (!sGMPCapabilities) {
+    *aHasPlugin = false;
+    return NS_OK;
+  }
+
+  nsCString api(aAPI);
+  for (const GMPCapabilityAndVersion& plugin : *sGMPCapabilities) {
+    if (GMPCapability::Supports(plugin.mCapabilities, api, *aTags)) {
+      *aHasPlugin = true;
+      return NS_OK;
+    }
+  }
+
+  *aHasPlugin = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceChild::GetNodeId(
+    const nsAString& aOrigin, const nsAString& aTopLevelOrigin,
+    const nsAString& aGMPName, UniquePtr<GetNodeIdCallback>&& aCallback) {
+  AssertOnGMPThread();
+
+  GetNodeIdCallback* rawCallback = aCallback.release();
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  nsString origin(aOrigin);
+  nsString topLevelOrigin(aTopLevelOrigin);
+  nsString gmpName(aGMPName);
+  GetServiceChild()->Then(
+      thread, __func__,
+      [rawCallback, origin, topLevelOrigin, gmpName](GMPServiceChild* child) {
+        UniquePtr<GetNodeIdCallback> callback(rawCallback);
+        nsCString outId;
+        if (!child->SendGetGMPNodeId(origin, topLevelOrigin, gmpName, &outId)) {
+          callback->Done(NS_ERROR_FAILURE, ""_ns);
+          return;
+        }
+
+        callback->Done(NS_OK, outId);
+      },
+      [rawCallback](nsresult rv) {
+        UniquePtr<GetNodeIdCallback> callback(rawCallback);
+        callback->Done(NS_ERROR_FAILURE, ""_ns);
+      });
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceChild::Observe(nsISupports* aSubject, const char* aTopic,
+                                      const char16_t* aSomeData) {
+  MOZ_ASSERT(NS_IsMainThread());
+  GMP_LOG_DEBUG("%s::%s: aTopic=%s", __CLASS__, __FUNCTION__, aTopic);
+  if (!strcmp(NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, aTopic)) {
+    if (mServiceChild) {
+      MutexAutoLock lock(mMutex);
+      mozilla::SyncRunnable::DispatchToThread(
+          mGMPThread,
+          WrapRunnable(mServiceChild.get(), &PGMPServiceChild::Close));
+      mServiceChild = nullptr;
+    }
+    ShutdownGMPThread();
+  }
+
+  return NS_OK;
+}
+
+RefPtr<GeckoMediaPluginServiceChild::GetServiceChildPromise>
+GeckoMediaPluginServiceChild::GetServiceChild() {
+  AssertOnGMPThread();
+
+  if (!mServiceChild) {
+    if (mShuttingDownOnGMPThread) {
+      // We have begun shutdown. Don't allow a new connection to the main
+      // process to be instantiated. This also prevents new plugins being
+      // instantiated.
+      return GetServiceChildPromise::CreateAndReject(NS_ERROR_FAILURE,
+                                                     __func__);
+    }
+    dom::ContentChild* contentChild = dom::ContentChild::GetSingleton();
+    if (!contentChild) {
+      return GetServiceChildPromise::CreateAndReject(NS_ERROR_FAILURE,
+                                                     __func__);
+    }
+    MozPromiseHolder<GetServiceChildPromise>* holder =
+        mGetServiceChildPromises.AppendElement();
+    RefPtr<GetServiceChildPromise> promise = holder->Ensure(__func__);
+    if (mGetServiceChildPromises.Length() == 1) {
+      nsCOMPtr<nsIRunnable> r =
+          WrapRunnable(contentChild, &dom::ContentChild::SendCreateGMPService);
+      SchedulerGroup::Dispatch(TaskCategory::Other, r.forget());
+    }
+    return promise;
+  }
+  return GetServiceChildPromise::CreateAndResolve(mServiceChild.get(),
+                                                  __func__);
+}
+
+void GeckoMediaPluginServiceChild::SetServiceChild(
+    RefPtr<GMPServiceChild>&& aServiceChild) {
+  AssertOnGMPThread();
+  MOZ_ASSERT(!mServiceChild, "Should not already have service child!");
+  GMP_LOG_DEBUG("%s::%s: aServiceChild=%p", __CLASS__, __FUNCTION__,
+                aServiceChild.get());
+
+  mServiceChild = std::move(aServiceChild);
+
+  nsTArray<MozPromiseHolder<GetServiceChildPromise>> holders =
+      std::move(mGetServiceChildPromises);
+  for (MozPromiseHolder<GetServiceChildPromise>& holder : holders) {
+    holder.Resolve(mServiceChild.get(), __func__);
+  }
+}
+
+void GeckoMediaPluginServiceChild::RemoveGMPContentParent(
+    GMPContentParent* aGMPContentParent) {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG(
+      "%s::%s: aGMPContentParent=%p, mServiceChild=%p, "
+      "mShuttingDownOnGMPThread=%s",
+      __CLASS__, __FUNCTION__, aGMPContentParent, mServiceChild.get(),
+      mShuttingDownOnGMPThread ? "true" : "false");
+
+  if (mServiceChild) {
+    mServiceChild->RemoveGMPContentParent(aGMPContentParent);
+    GMP_LOG_DEBUG(
+        "%s::%s: aGMPContentParent removed, "
+        "mServiceChild->HaveContentParents()=%s",
+        __CLASS__, __FUNCTION__,
+        mServiceChild->HaveContentParents() ? "true" : "false");
+    RemoveShutdownBlockerIfNeeded();
+  }
+}
+
+nsresult GeckoMediaPluginServiceChild::AddShutdownBlocker() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mShuttingDownOnGMPThread,
+             "No call paths should add blockers once we're shutting down!");
+#ifdef DEBUG
+  MOZ_ASSERT(!mShutdownBlockerAdded, "Should only add blocker once!");
+  mShutdownBlockerAdded = true;
+#endif
+  GMP_LOG_DEBUG("%s::%s ", __CLASS__, __FUNCTION__);
+
+  nsresult rv = GetShutdownBarrier()->AddBlocker(
+      this, NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__,
+      kShutdownBlockerName);
+  return rv;
+}
+
+void GeckoMediaPluginServiceChild::RemoveShutdownBlocker() {
+  AssertOnGMPThread();
+  MOZ_ASSERT(mShuttingDownOnGMPThread,
+             "We should only remove blockers once we're "
+             "shutting down!");
+  GMP_LOG_DEBUG("%s::%s ", __CLASS__, __FUNCTION__);
+  nsresult rv = mMainThread->Dispatch(NS_NewRunnableFunction(
+      "GeckoMediaPluginServiceChild::"
+      "RemoveShutdownBlocker",
+      [this, self = RefPtr<GeckoMediaPluginServiceChild>(this)]() {
+        nsresult rv = GetShutdownBarrier()->RemoveBlocker(this);
+        MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
+      }));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    MOZ_ASSERT_UNREACHABLE(
+        "Main thread should always be alive when we "
+        "call this!");
+  }
+}
+
+void GeckoMediaPluginServiceChild::RemoveShutdownBlockerIfNeeded() {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG(
+      "%s::%s mPendingGetContentParents=%" PRIu32
+      " mServiceChild->HaveContentParents()=%s "
+      "mShuttingDownOnGMPThread=%s",
+      __CLASS__, __FUNCTION__, mPendingGetContentParents,
+      mServiceChild && mServiceChild->HaveContentParents() ? "true" : "false",
+      mShuttingDownOnGMPThread ? "true" : "false");
+
+  bool haveOneOrMoreContentParents =
+      mPendingGetContentParents > 0 ||
+      (mServiceChild && mServiceChild->HaveContentParents());
+
+  if (!mShuttingDownOnGMPThread || haveOneOrMoreContentParents) {
+    return;
+  }
+  RemoveShutdownBlocker();
+}
+
+already_AddRefed<GMPContentParent> GMPServiceChild::GetBridgedGMPContentParent(
+    ProcessId aOtherPid, ipc::Endpoint<PGMPContentParent>&& endpoint) {
+  return do_AddRef(mContentParents.LookupOrInsertWith(aOtherPid, [&] {
+    MOZ_ASSERT(aOtherPid == endpoint.OtherPid());
+
+    auto parent = MakeRefPtr<GMPContentParent>();
+
+    DebugOnly<bool> ok = endpoint.Bind(parent);
+    MOZ_ASSERT(ok);
+
+    return parent;
+  }));
+}
+
+void GMPServiceChild::RemoveGMPContentParent(
+    GMPContentParent* aGMPContentParent) {
+  for (auto iter = mContentParents.Iter(); !iter.Done(); iter.Next()) {
+    RefPtr<GMPContentParent>& parent = iter.Data();
+    if (parent == aGMPContentParent) {
+      iter.Remove();
+      break;
+    }
+  }
+}
+
+void GMPServiceChild::GetAlreadyBridgedTo(
+    nsTArray<base::ProcessId>& aAlreadyBridgedTo) {
+  AppendToArray(aAlreadyBridgedTo, mContentParents.Keys());
+}
+
+class OpenPGMPServiceChild : public mozilla::Runnable {
+ public:
+  OpenPGMPServiceChild(RefPtr<GMPServiceChild>&& aGMPServiceChild,
+                       ipc::Endpoint<PGMPServiceChild>&& aEndpoint)
+      : Runnable("gmp::OpenPGMPServiceChild"),
+        mGMPServiceChild(std::move(aGMPServiceChild)),
+        mEndpoint(std::move(aEndpoint)) {}
+
+  NS_IMETHOD Run() override {
+    RefPtr<GeckoMediaPluginServiceChild> gmp =
+        GeckoMediaPluginServiceChild::GetSingleton();
+    MOZ_ASSERT(!gmp->mServiceChild);
+    if (mEndpoint.Bind(mGMPServiceChild.get())) {
+      gmp->SetServiceChild(std::move(mGMPServiceChild));
+    } else {
+      gmp->SetServiceChild(nullptr);
+    }
+    return NS_OK;
+  }
+
+ private:
+  RefPtr<GMPServiceChild> mGMPServiceChild;
+  ipc::Endpoint<PGMPServiceChild> mEndpoint;
+};
+
+/* static */
+bool GMPServiceChild::Create(Endpoint<PGMPServiceChild>&& aGMPService) {
+  RefPtr<GeckoMediaPluginServiceChild> gmp =
+      GeckoMediaPluginServiceChild::GetSingleton();
+  MOZ_ASSERT(!gmp->mServiceChild);
+
+  RefPtr<GMPServiceChild> serviceChild(new GMPServiceChild());
+
+  nsCOMPtr<nsIThread> gmpThread;
+  nsresult rv = gmp->GetThread(getter_AddRefs(gmpThread));
+  NS_ENSURE_SUCCESS(rv, false);
+
+  rv = gmpThread->Dispatch(
+      new OpenPGMPServiceChild(std::move(serviceChild), std::move(aGMPService)),
+      NS_DISPATCH_NORMAL);
+  return NS_SUCCEEDED(rv);
+}
+
+ipc::IPCResult GMPServiceChild::RecvBeginShutdown() {
+  RefPtr<GeckoMediaPluginServiceChild> service =
+      GeckoMediaPluginServiceChild::GetSingleton();
+  MOZ_ASSERT(service && service->mServiceChild.get() == this);
+  if (service) {
+    service->BeginShutdown();
+  }
+  return IPC_OK();
+}
+
+bool GMPServiceChild::HaveContentParents() const {
+  return mContentParents.Count() > 0;
+}
+
+}  // namespace mozilla::gmp
+
+#undef __CLASS__
diff --git a/dom/media/gmp/GMPServiceChild.h b/dom/media/gmp/GMPServiceChild.h
new file mode 100644
index 0000000000..329cf2f9df
--- /dev/null
+++ b/dom/media/gmp/GMPServiceChild.h
@@ -0,0 +1,163 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPServiceChild_h_
+#define GMPServiceChild_h_
+
+#include "GMPService.h"
+#include "MediaResult.h"
+#include "base/process.h"
+#include "mozilla/dom/PContent.h"
+#include "mozilla/gmp/PGMPServiceChild.h"
+#include "mozilla/MozPromise.h"
+#include "nsIAsyncShutdown.h"
+#include "nsRefPtrHashtable.h"
+
+namespace mozilla::gmp {
+
+class GMPContentParent;
+class GMPServiceChild;
+
+class GeckoMediaPluginServiceChild : public GeckoMediaPluginService,
+                                     public nsIAsyncShutdownBlocker {
+  friend class GMPServiceChild;
+
+ public:
+  static already_AddRefed<GeckoMediaPluginServiceChild> GetSingleton();
+  nsresult Init() override;
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIASYNCSHUTDOWNBLOCKER
+
+  NS_IMETHOD HasPluginForAPI(const nsACString& aAPI, nsTArray<nsCString>* aTags,
+                             bool* aRetVal) override;
+  NS_IMETHOD GetNodeId(const nsAString& aOrigin,
+                       const nsAString& aTopLevelOrigin,
+                       const nsAString& aGMPName,
+                       UniquePtr<GetNodeIdCallback>&& aCallback) override;
+
+  NS_DECL_NSIOBSERVER
+
+  void SetServiceChild(RefPtr<GMPServiceChild>&& aServiceChild);
+
+  void RemoveGMPContentParent(GMPContentParent* aGMPContentParent);
+
+  static void UpdateGMPCapabilities(
+      nsTArray<mozilla::dom::GMPCapabilityData>&& aCapabilities);
+
+  void BeginShutdown();
+
+ protected:
+  void InitializePlugins(nsISerialEventTarget*) override {
+    // Nothing to do here.
+  }
+
+  RefPtr<GetGMPContentParentPromise> GetContentParent(
+      GMPCrashHelper* aHelper, const NodeIdVariant& aNodeIdVariant,
+      const nsACString& aAPI, const nsTArray<nsCString>& aTags) override;
+
+ private:
+  friend class OpenPGMPServiceChild;
+
+  ~GeckoMediaPluginServiceChild() override;
+
+  typedef MozPromise<GMPServiceChild*, MediaResult, /* IsExclusive = */ true>
+      GetServiceChildPromise;
+  RefPtr<GetServiceChildPromise> GetServiceChild();
+
+  nsTArray<MozPromiseHolder<GetServiceChildPromise>> mGetServiceChildPromises;
+  RefPtr<GMPServiceChild> mServiceChild;
+
+  // Shutdown blocker management. A shutdown blocker is used to ensure that
+  // we do not shutdown until all content parents are removed from
+  // GMPServiceChild::mContentParents.
+  //
+  // The following rules let us shutdown block (and thus we shouldn't
+  // violate them):
+  // - We will only call GetContentParent if mShuttingDownOnGMPThread is false.
+  // - mShuttingDownOnGMPThread will become true once profile teardown is
+  //   observed in the parent process (and once GMPServiceChild receives a
+  //   message from GMPServiceParent) or if we block shutdown (which implies
+  //   we're in shutdown).
+  // - If we currently have mPendingGetContentParents > 0 or parents in
+  //   GMPServiceChild::mContentParents we should block shutdown so such
+  //   parents can be cleanly shutdown.
+  // therefore
+  // - We can block shutdown at xpcom-will-shutdown until our content parents
+  //   are handled.
+  // - Because once mShuttingDownOnGMPThread is true we cannot add new content
+  //   parents, we know that when mShuttingDownOnGMPThread && all content
+  //   parents are handled we'll never add more and it's safe to stop blocking
+  //   shutdown.
+  // this relies on
+  // - Once we're shutting down, we need to ensure all content parents are
+  //   shutdown and removed. Failure to do so will result in a shutdown stall.
+
+  // Note that at the time of writing there are significant differences in how
+  // xpcom shutdown is handled in release and non-release builds. For example,
+  // in release builds content processes are exited early, so xpcom shutdown
+  // is not observed (and not blocked by blockers). This is important to keep
+  // in mind when testing the shutdown blocking machinery (you won't see most
+  // of it be invoked in release).
+
+  // All of these members should only be used on the GMP thread unless
+  // otherwise noted!
+
+  // Add a shutdown blocker. Main thread only. Should only be called once when
+  // we init the service.
+  nsresult AddShutdownBlocker();
+  // Remove a shutdown blocker. Should be called once at most and only when
+  // mShuttingDownOnGMPThread. Prefer RemoveShutdownBlockerIfNeeded unless
+  // absolutely certain you need to call this directly.
+  void RemoveShutdownBlocker();
+  // Remove shutdown blocker if the following conditions are met:
+  // - mShuttingDownOnGMPThread.
+  // - !mServiceChild->HaveContentParents.
+  // - mPendingGetContentParents == 0.
+  // - mShutdownBlockerHasBeenAdded.
+  void RemoveShutdownBlockerIfNeeded();
+
+#ifdef DEBUG
+  // Track if we've added a shutdown blocker for sanity checking. Main thread
+  // only.
+  bool mShutdownBlockerAdded = false;
+#endif  // DEBUG
+  // The number of GetContentParent calls that have not yet been resolved or
+  // rejected. We use this value to help determine if we need to block
+  // shutdown. Should only be used on GMP thread to avoid races.
+  uint32_t mPendingGetContentParents = 0;
+  // End shutdown blocker management.
+};
+
+class GMPServiceChild : public PGMPServiceChild {
+ public:
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PGMPServiceChild.
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPServiceChild, final)
+
+  explicit GMPServiceChild() = default;
+
+  already_AddRefed<GMPContentParent> GetBridgedGMPContentParent(
+      ProcessId aOtherPid, ipc::Endpoint<PGMPContentParent>&& endpoint);
+
+  void RemoveGMPContentParent(GMPContentParent* aGMPContentParent);
+
+  void GetAlreadyBridgedTo(nsTArray<ProcessId>& aAlreadyBridgedTo);
+
+  static bool Create(Endpoint<PGMPServiceChild>&& aGMPService);
+
+  ipc::IPCResult RecvBeginShutdown() override;
+
+  bool HaveContentParents() const;
+
+ private:
+  ~GMPServiceChild() = default;
+
+  nsRefPtrHashtable<nsUint64HashKey, GMPContentParent> mContentParents;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPServiceChild_h_
diff --git a/dom/media/gmp/GMPServiceParent.cpp b/dom/media/gmp/GMPServiceParent.cpp
new file mode 100644
index 0000000000..996c25e263
--- /dev/null
+++ b/dom/media/gmp/GMPServiceParent.cpp
@@ -0,0 +1,1926 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPServiceParent.h"
+
+#include <limits>
+
+#include "GMPDecoderModule.h"
+#include "GMPLog.h"
+#include "GMPParent.h"
+#include "GMPVideoDecoderParent.h"
+#include "mozilla/ipc/GeckoChildProcessHost.h"
+#include "base/task.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/ipc/Endpoint.h"
+#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+#  include "mozilla/SandboxInfo.h"
+#endif
+#include "VideoUtils.h"
+#include "mozilla/AppShutdown.h"
+#include "mozilla/Services.h"
+#include "mozilla/SpinEventLoopUntil.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "mozilla/SyncRunnable.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/Unused.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsComponentManagerUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsNetUtil.h"
+#include "nsHashKeys.h"
+#include "nsIFile.h"
+#include "nsIObserverService.h"
+#include "nsIXULRuntime.h"
+#include "nsNativeCharsetUtils.h"
+#include "nsXPCOMPrivate.h"
+#include "prio.h"
+#include "runnable_utils.h"
+
+#ifdef DEBUG
+#  include "mozilla/dom/MediaKeys.h"  // MediaKeys::kMediaKeysRequestTopic
+#endif
+
+namespace mozilla::gmp {
+
+#ifdef __CLASS__
+#  undef __CLASS__
+#endif
+#define __CLASS__ "GMPServiceParent"
+
+static const uint32_t NodeIdSaltLength = 32;
+
+already_AddRefed<GeckoMediaPluginServiceParent>
+GeckoMediaPluginServiceParent::GetSingleton() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  RefPtr<GeckoMediaPluginService> service(
+      GeckoMediaPluginServiceParent::GetGeckoMediaPluginService());
+#ifdef DEBUG
+  if (service) {
+    nsCOMPtr<mozIGeckoMediaPluginChromeService> chromeService;
+    CallQueryInterface(service.get(), getter_AddRefs(chromeService));
+    MOZ_ASSERT(chromeService);
+  }
+#endif
+  return service.forget().downcast<GeckoMediaPluginServiceParent>();
+}
+
+NS_IMPL_ISUPPORTS_INHERITED(GeckoMediaPluginServiceParent,
+                            GeckoMediaPluginService,
+                            mozIGeckoMediaPluginChromeService,
+                            nsIAsyncShutdownBlocker)
+
+GeckoMediaPluginServiceParent::GeckoMediaPluginServiceParent()
+    : mScannedPluginOnDisk(false),
+      mShuttingDown(false),
+      mWaitingForPluginsSyncShutdown(false),
+      mInitPromiseMonitor("GeckoMediaPluginServiceParent::mInitPromiseMonitor"),
+      mInitPromise(&mInitPromiseMonitor),
+      mLoadPluginsFromDiskComplete(false) {
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+GeckoMediaPluginServiceParent::~GeckoMediaPluginServiceParent() {
+  MOZ_ASSERT(mPlugins.IsEmpty());
+}
+
+nsresult GeckoMediaPluginServiceParent::Init() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (AppShutdown::GetCurrentShutdownPhase() != ShutdownPhase::NotInShutdown) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIObserverService> obsService =
+      mozilla::services::GetObserverService();
+  MOZ_ASSERT(obsService);
+
+  MOZ_ALWAYS_SUCCEEDS(
+      obsService->AddObserver(this, "profile-change-teardown", false));
+  MOZ_ALWAYS_SUCCEEDS(
+      obsService->AddObserver(this, "last-pb-context-exited", false));
+  MOZ_ALWAYS_SUCCEEDS(
+      obsService->AddObserver(this, "browser:purge-session-history", false));
+  MOZ_ALWAYS_SUCCEEDS(
+      obsService->AddObserver(this, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID, false));
+
+#ifdef DEBUG
+  MOZ_ALWAYS_SUCCEEDS(obsService->AddObserver(
+      this, dom::MediaKeys::kMediaKeysRequestTopic, false));
+#endif
+
+  nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
+  if (prefs) {
+    prefs->AddObserver("media.gmp.plugin.crash", this, false);
+  }
+
+  nsresult rv = InitStorage();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // Kick off scanning for plugins
+  nsCOMPtr<nsIThread> thread;
+  rv = GetThread(getter_AddRefs(thread));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // Detect if GMP storage has an incompatible version, and if so nuke it.
+  int32_t version =
+      Preferences::GetInt("media.gmp.storage.version.observed", 0);
+  int32_t expected =
+      Preferences::GetInt("media.gmp.storage.version.expected", 0);
+  if (version != expected) {
+    Preferences::SetInt("media.gmp.storage.version.observed", expected);
+    return GMPDispatch(
+        NewRunnableMethod("gmp::GeckoMediaPluginServiceParent::ClearStorage",
+                          this, &GeckoMediaPluginServiceParent::ClearStorage));
+  }
+  return NS_OK;
+}
+
+already_AddRefed<nsIFile> CloneAndAppend(nsIFile* aFile,
+                                         const nsAString& aDir) {
+  nsCOMPtr<nsIFile> f;
+  nsresult rv = aFile->Clone(getter_AddRefs(f));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+
+  rv = f->Append(aDir);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+  return f.forget();
+}
+
+static nsresult GMPPlatformString(nsAString& aOutPlatform) {
+  // Append the OS and arch so that we don't reuse the storage if the profile is
+  // copied or used under a different bit-ness, or copied to another platform.
+  nsCOMPtr<nsIXULRuntime> runtime = do_GetService("@mozilla.org/xre/runtime;1");
+  if (!runtime) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsAutoCString OS;
+  nsresult rv = runtime->GetOS(OS);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoCString arch;
+  rv = runtime->GetXPCOMABI(arch);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCString platform;
+  platform.Append(OS);
+  platform.AppendLiteral("_");
+  platform.Append(arch);
+
+  CopyUTF8toUTF16(platform, aOutPlatform);
+
+  return NS_OK;
+}
+
+nsresult GeckoMediaPluginServiceParent::InitStorage() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // GMP storage should be used in the chrome process only.
+  if (!XRE_IsParentProcess()) {
+    return NS_OK;
+  }
+
+  // Directory service is main thread only, so cache the profile dir here
+  // so that we can use it off main thread.
+  nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                       getter_AddRefs(mStorageBaseDir));
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mStorageBaseDir->AppendNative("gmp"_ns);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoString platform;
+  rv = GMPPlatformString(platform);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = mStorageBaseDir->Append(platform);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return GeckoMediaPluginService::Init();
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::Observe(nsISupports* aSubject,
+                                       const char* aTopic,
+                                       const char16_t* aSomeData) {
+  GMP_LOG_DEBUG("%s::%s topic='%s' data='%s'", __CLASS__, __FUNCTION__, aTopic,
+                NS_ConvertUTF16toUTF8(aSomeData).get());
+  if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
+    nsCOMPtr<nsIPrefBranch> branch(do_QueryInterface(aSubject));
+    if (branch) {
+      bool crashNow = false;
+      if (u"media.gmp.plugin.crash"_ns.Equals(aSomeData)) {
+        branch->GetBoolPref("media.gmp.plugin.crash", &crashNow);
+      }
+      if (crashNow) {
+        nsCOMPtr<nsIThread> gmpThread;
+        {
+          MutexAutoLock lock(mMutex);
+          gmpThread = mGMPThread;
+        }
+        if (gmpThread) {
+          // Note: the GeckoMediaPluginServiceParent singleton is kept alive by
+          // a static refptr that is only cleared in the final stage of shutdown
+          // after everything else is shutdown, so this RefPtr<> is not strictly
+          // necessary so long as that is true, but it's safer.
+          gmpThread->Dispatch(
+              WrapRunnable(RefPtr<GeckoMediaPluginServiceParent>(this),
+                           &GeckoMediaPluginServiceParent::CrashPlugins),
+              NS_DISPATCH_NORMAL);
+        }
+      }
+    }
+  } else if (!strcmp("profile-change-teardown", aTopic)) {
+    mWaitingForPluginsSyncShutdown = true;
+
+    nsCOMPtr<nsIThread> gmpThread;
+    DebugOnly<bool> plugins_empty;
+    {
+      MutexAutoLock lock(mMutex);
+      MOZ_ASSERT(!mShuttingDown);
+      mShuttingDown = true;
+      gmpThread = mGMPThread;
+#ifdef DEBUG
+      plugins_empty = mPlugins.IsEmpty();
+#endif
+    }
+
+    if (gmpThread) {
+      GMP_LOG_DEBUG(
+          "%s::%s Starting to unload plugins, waiting for sync shutdown...",
+          __CLASS__, __FUNCTION__);
+      gmpThread->Dispatch(
+          NewRunnableMethod("gmp::GeckoMediaPluginServiceParent::UnloadPlugins",
+                            this,
+                            &GeckoMediaPluginServiceParent::UnloadPlugins),
+          NS_DISPATCH_NORMAL);
+
+      // Wait for UnloadPlugins() to do sync shutdown...
+      SpinEventLoopUntil(
+          "GeckoMediaPluginServiceParent::Observe "
+          "WaitingForPluginsSyncShutdown"_ns,
+          [&]() { return !mWaitingForPluginsSyncShutdown; });
+    } else {
+      // GMP thread has already shutdown.
+      MOZ_ASSERT(plugins_empty);
+      mWaitingForPluginsSyncShutdown = false;
+    }
+
+  } else if (!strcmp(NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID, aTopic)) {
+#ifdef DEBUG
+    MOZ_ASSERT(mShuttingDown);
+#endif
+    ShutdownGMPThread();
+  } else if (!strcmp(NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID, aTopic)) {
+    mXPCOMWillShutdown = true;
+  } else if (!strcmp("last-pb-context-exited", aTopic)) {
+    // When Private Browsing mode exits, all we need to do is clear
+    // mTempNodeIds. This drops all the node ids we've cached in memory
+    // for PB origin-pairs. If we try to open an origin-pair for non-PB
+    // mode, we'll get the NodeId salt stored on-disk, and if we try to
+    // open a PB mode origin-pair, we'll re-generate new salt.
+    mTempNodeIds.Clear();
+  } else if (!strcmp("browser:purge-session-history", aTopic)) {
+    // Clear everything!
+    if (!aSomeData || nsDependentString(aSomeData).IsEmpty()) {
+      return GMPDispatch(NewRunnableMethod(
+          "gmp::GeckoMediaPluginServiceParent::ClearStorage", this,
+          &GeckoMediaPluginServiceParent::ClearStorage));
+    }
+
+    // Clear nodeIds/records modified after |t|.
+    nsresult rv;
+    PRTime t = nsDependentString(aSomeData).ToInteger64(&rv, 10);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    return GMPDispatch(NewRunnableMethod<PRTime>(
+        "gmp::GeckoMediaPluginServiceParent::ClearRecentHistoryOnGMPThread",
+        this, &GeckoMediaPluginServiceParent::ClearRecentHistoryOnGMPThread,
+        t));
+  }
+
+  return NS_OK;
+}
+
+RefPtr<GenericPromise> GeckoMediaPluginServiceParent::EnsureInitialized() {
+  MonitorAutoLock lock(mInitPromiseMonitor);
+  if (mLoadPluginsFromDiskComplete) {
+    return GenericPromise::CreateAndResolve(true, __func__);
+  }
+  // We should have an init promise in flight.
+  MOZ_ASSERT(!mInitPromise.IsEmpty());
+  return mInitPromise.Ensure(__func__);
+}
+
+RefPtr<GetGMPContentParentPromise>
+GeckoMediaPluginServiceParent::GetContentParent(
+    GMPCrashHelper* aHelper, const NodeIdVariant& aNodeIdVariant,
+    const nsACString& aAPI, const nsTArray<nsCString>& aTags) {
+  AssertOnGMPThread();
+
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  if (!thread) {
+    MOZ_ASSERT_UNREACHABLE(
+        "We should always be called on GMP thread, so it should be live");
+    return GetGMPContentParentPromise::CreateAndReject(NS_ERROR_FAILURE,
+                                                       __func__);
+  }
+
+  nsCString nodeIdString;
+  nsresult rv = GetNodeId(aNodeIdVariant, nodeIdString);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GetGMPContentParentPromise::CreateAndReject(NS_ERROR_FAILURE,
+                                                       __func__);
+  }
+
+  auto holder = MakeUnique<MozPromiseHolder<GetGMPContentParentPromise>>();
+  RefPtr<GetGMPContentParentPromise> promise = holder->Ensure(__func__);
+  EnsureInitialized()->Then(
+      thread, __func__,
+      [self = RefPtr<GeckoMediaPluginServiceParent>(this),
+       nodeIdString = std::move(nodeIdString), api = nsCString(aAPI),
+       tags = aTags.Clone(), helper = RefPtr<GMPCrashHelper>(aHelper),
+       holder = std::move(holder)](
+          const GenericPromise::ResolveOrRejectValue& aValue) mutable -> void {
+        if (aValue.IsReject()) {
+          NS_WARNING("GMPService::EnsureInitialized failed.");
+          holder->Reject(NS_ERROR_FAILURE, __func__);
+          return;
+        }
+        RefPtr<GMPParent> gmp =
+            self->SelectPluginForAPI(nodeIdString, api, tags);
+        GMP_LOG_DEBUG("%s: %p returning %p for api %s", __FUNCTION__,
+                      self.get(), gmp.get(), api.get());
+        if (!gmp) {
+          NS_WARNING(
+              "GeckoMediaPluginServiceParent::GetContentParentFrom failed");
+          holder->Reject(NS_ERROR_FAILURE, __func__);
+          return;
+        }
+        self->ConnectCrashHelper(gmp->GetPluginId(), helper);
+        gmp->GetGMPContentParent(std::move(holder));
+      });
+
+  return promise;
+}
+
+void GeckoMediaPluginServiceParent::InitializePlugins(
+    nsISerialEventTarget* aGMPThread) {
+  MOZ_ASSERT(aGMPThread);
+  MonitorAutoLock lock(mInitPromiseMonitor);
+  if (mLoadPluginsFromDiskComplete) {
+    return;
+  }
+
+  RefPtr<GeckoMediaPluginServiceParent> self(this);
+  RefPtr<GenericPromise> p = mInitPromise.Ensure(__func__);
+  InvokeAsync(aGMPThread, this, __func__,
+              &GeckoMediaPluginServiceParent::LoadFromEnvironment)
+      ->Then(
+          aGMPThread, __func__,
+          [self]() -> void {
+            MonitorAutoLock lock(self->mInitPromiseMonitor);
+            self->mLoadPluginsFromDiskComplete = true;
+            self->mInitPromise.Resolve(true, __func__);
+          },
+          [self]() -> void {
+            MonitorAutoLock lock(self->mInitPromiseMonitor);
+            self->mLoadPluginsFromDiskComplete = true;
+            self->mInitPromise.Reject(NS_ERROR_FAILURE, __func__);
+          });
+}
+
+void GeckoMediaPluginServiceParent::NotifySyncShutdownComplete() {
+  MOZ_ASSERT(NS_IsMainThread());
+  mWaitingForPluginsSyncShutdown = false;
+}
+
+bool GeckoMediaPluginServiceParent::IsShuttingDown() {
+  AssertOnGMPThread();
+  return mShuttingDownOnGMPThread;
+}
+
+void GeckoMediaPluginServiceParent::UnloadPlugins() {
+  AssertOnGMPThread();
+  MOZ_ASSERT(!mShuttingDownOnGMPThread);
+  mShuttingDownOnGMPThread = true;
+
+  nsTArray<RefPtr<GMPParent>> plugins;
+  {
+    MutexAutoLock lock(mMutex);
+    // Move all plugins references to a local array. This way mMutex won't be
+    // locked when calling CloseActive (to avoid inter-locking).
+    std::swap(plugins, mPlugins);
+
+    for (GMPServiceParent* parent : mServiceParents) {
+      Unused << parent->SendBeginShutdown();
+    }
+
+    GMP_LOG_DEBUG("%s::%s plugins:%zu", __CLASS__, __FUNCTION__,
+                  plugins.Length());
+#ifdef DEBUG
+    for (const auto& plugin : plugins) {
+      GMP_LOG_DEBUG("%s::%s plugin: '%s'", __CLASS__, __FUNCTION__,
+                    plugin->GetDisplayName().get());
+    }
+#endif
+  }
+
+  // Note: CloseActive may be async; it could actually finish
+  // shutting down when all the plugins have unloaded.
+  for (const auto& plugin : plugins) {
+    plugin->CloseActive(true);
+  }
+
+  nsCOMPtr<nsIRunnable> task = NewRunnableMethod(
+      "GeckoMediaPluginServiceParent::NotifySyncShutdownComplete", this,
+      &GeckoMediaPluginServiceParent::NotifySyncShutdownComplete);
+  mMainThread->Dispatch(task.forget());
+}
+
+void GeckoMediaPluginServiceParent::CrashPlugins() {
+  GMP_LOG_DEBUG("%s::%s", __CLASS__, __FUNCTION__);
+  AssertOnGMPThread();
+
+  MutexAutoLock lock(mMutex);
+  for (size_t i = 0; i < mPlugins.Length(); i++) {
+    mPlugins[i]->Crash();
+  }
+}
+
+RefPtr<GenericPromise> GeckoMediaPluginServiceParent::LoadFromEnvironment() {
+  AssertOnGMPThread();
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  if (!thread) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  const char* env = PR_GetEnv("MOZ_GMP_PATH");
+  if (!env || !*env) {
+    return GenericPromise::CreateAndResolve(true, __func__);
+  }
+
+  nsString allpaths;
+  if (NS_WARN_IF(NS_FAILED(
+          NS_CopyNativeToUnicode(nsDependentCString(env), allpaths)))) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  nsTArray<RefPtr<GenericPromise>> promises;
+  uint32_t pos = 0;
+  while (pos < allpaths.Length()) {
+    // Loop over multiple path entries separated by colons (*nix) or
+    // semicolons (Windows)
+    int32_t next = allpaths.FindChar(XPCOM_ENV_PATH_SEPARATOR[0], pos);
+    if (next == -1) {
+      promises.AppendElement(
+          AddOnGMPThread(nsString(Substring(allpaths, pos))));
+      break;
+    } else {
+      promises.AppendElement(
+          AddOnGMPThread(nsString(Substring(allpaths, pos, next - pos))));
+      pos = next + 1;
+    }
+  }
+
+  mScannedPluginOnDisk = true;
+  return GenericPromise::All(thread, promises)
+      ->Then(
+          thread, __func__,
+          []() { return GenericPromise::CreateAndResolve(true, __func__); },
+          []() {
+            return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+          });
+}
+
+class NotifyObserversTask final : public mozilla::Runnable {
+ public:
+  explicit NotifyObserversTask(const char* aTopic, nsString aData = u""_ns)
+      : Runnable(aTopic), mTopic(aTopic), mData(aData) {}
+  NS_IMETHOD Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+    nsCOMPtr<nsIObserverService> obsService =
+        mozilla::services::GetObserverService();
+    MOZ_ASSERT(obsService);
+    if (obsService) {
+      obsService->NotifyObservers(nullptr, mTopic, mData.get());
+    }
+    return NS_OK;
+  }
+
+ private:
+  ~NotifyObserversTask() = default;
+  const char* mTopic;
+  const nsString mData;
+};
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::PathRunnable::Run() {
+  mService->RemoveOnGMPThread(mPath, mOperation == REMOVE_AND_DELETE_FROM_DISK,
+                              mDefer);
+
+  mService->UpdateContentProcessGMPCapabilities();
+  return NS_OK;
+}
+
+void GeckoMediaPluginServiceParent::UpdateContentProcessGMPCapabilities(
+    ContentParent* aContentProcess) {
+  if (!NS_IsMainThread()) {
+    nsCOMPtr<nsIRunnable> task = NewRunnableMethod<ContentParent*>(
+        "GeckoMediaPluginServiceParent::UpdateContentProcessGMPCapabilities",
+        this,
+        &GeckoMediaPluginServiceParent::UpdateContentProcessGMPCapabilities,
+        aContentProcess);
+    mMainThread->Dispatch(task.forget());
+    return;
+  }
+
+  typedef mozilla::dom::GMPCapabilityData GMPCapabilityData;
+  typedef mozilla::dom::GMPAPITags GMPAPITags;
+  typedef mozilla::dom::ContentParent ContentParent;
+
+  const uint32_t NO_H264 = 0;
+  const uint32_t HAS_H264 = 1;
+  const uint32_t NO_H264_1_DIR = 2;
+  const uint32_t NO_H264_2_PLUS_DIRS = 3;
+  const uint32_t NO_H264_DIR_IN_PROGRESS = 4;
+  uint32_t hasH264 = NO_H264;
+  if (mDirectoriesAdded == 1) {
+    hasH264 = NO_H264_1_DIR;
+  } else if (mDirectoriesAdded > 1) {
+    hasH264 = NO_H264_2_PLUS_DIRS;
+  }
+  if (mDirectoriesInProgress) {
+    hasH264 = NO_H264_DIR_IN_PROGRESS;
+  }
+  nsTArray<GMPCapabilityData> caps;
+  {
+    MutexAutoLock lock(mMutex);
+    for (const RefPtr<GMPParent>& gmp : mPlugins) {
+      // We have multiple instances of a GMPParent for a given GMP in the
+      // list, one per origin. So filter the list so that we don't include
+      // the same GMP's capabilities twice.
+      NS_ConvertUTF16toUTF8 name(gmp->GetPluginBaseName());
+      bool found = false;
+      for (const GMPCapabilityData& cap : caps) {
+        if (cap.name().Equals(name)) {
+          found = true;
+          break;
+        }
+      }
+      if (found) {
+        continue;
+      }
+      GMPCapabilityData x;
+      x.name() = name;
+      x.version() = gmp->GetVersion();
+      for (const GMPCapability& tag : gmp->GetCapabilities()) {
+        x.capabilities().AppendElement(GMPAPITags(tag.mAPIName, tag.mAPITags));
+        if (tag.mAPIName == nsLiteralCString(GMP_API_VIDEO_ENCODER) &&
+            tag.mAPITags.Contains("h264"_ns)) {
+          hasH264 = HAS_H264;
+        }
+      }
+      caps.AppendElement(std::move(x));
+    }
+  }
+
+  Telemetry::Accumulate(Telemetry::MEDIA_GMP_UPDATE_CONTENT_PROCESS_HAS_H264,
+                        hasH264);
+
+  if (aContentProcess) {
+    Unused << aContentProcess->SendGMPsChanged(caps);
+    return;
+  }
+
+  for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) {
+    Unused << cp->SendGMPsChanged(caps);
+  }
+
+  // For non-e10s, we must fire a notification so that any MediaKeySystemAccess
+  // requests waiting on a CDM to download will retry.
+  nsCOMPtr<nsIObserverService> obsService =
+      mozilla::services::GetObserverService();
+  MOZ_ASSERT(obsService);
+  if (obsService) {
+    obsService->NotifyObservers(nullptr, "gmp-changed", nullptr);
+  }
+}
+
+void GeckoMediaPluginServiceParent::SendFlushFOGData(
+    nsTArray<RefPtr<FlushFOGDataPromise>>& promises) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MutexAutoLock lock(mMutex);
+
+  for (const RefPtr<GMPParent>& gmp : mPlugins) {
+    if (gmp->State() != GMPState::GMPStateLoaded) {
+      // Plugins that are not in the Loaded state have no process attached to
+      // them, and any IPC we would attempt to send them would be ignored (or
+      // result in a warning on debug builds).
+      continue;
+    }
+    RefPtr<FlushFOGDataPromise::Private> promise =
+        new FlushFOGDataPromise::Private(__func__);
+    // Direct dispatch will resolve the promise on the same thread, which is
+    // faster; FOGIPC will move execution back to the main thread.
+    promise->UseDirectTaskDispatch(__func__);
+    promises.EmplaceBack(promise);
+
+    mGMPThread->Dispatch(
+        NewRunnableMethod<ipc::ResolveCallback<ipc::ByteBuf>&&,
+                          ipc::RejectCallback&&>(
+            "GMPParent::SendFlushFOGData", gmp,
+            static_cast<void (GMPParent::*)(
+                mozilla::ipc::ResolveCallback<ipc::ByteBuf> && aResolve,
+                mozilla::ipc::RejectCallback && aReject)>(
+                &GMPParent::SendFlushFOGData),
+
+            [promise](ipc::ByteBuf&& aValue) {
+              promise->Resolve(std::move(aValue), __func__);
+            },
+            [promise](ipc::ResponseRejectReason&& aReason) {
+              promise->Reject(std::move(aReason), __func__);
+            }),
+        NS_DISPATCH_NORMAL);
+  }
+}
+
+RefPtr<PGMPParent::TestTriggerMetricsPromise>
+GeckoMediaPluginServiceParent::TestTriggerMetrics() {
+  MOZ_ASSERT(NS_IsMainThread());
+  {
+    MutexAutoLock lock(mMutex);
+    for (const RefPtr<GMPParent>& gmp : mPlugins) {
+      if (gmp->State() != GMPState::GMPStateLoaded) {
+        // Plugins that are not in the Loaded state have no process attached to
+        // them, and any IPC we would attempt to send them would be ignored (or
+        // result in a warning on debug builds).
+        continue;
+      }
+
+      RefPtr<PGMPParent::TestTriggerMetricsPromise::Private> promise =
+          new PGMPParent::TestTriggerMetricsPromise::Private(__func__);
+      // Direct dispatch will resolve the promise on the same thread, which is
+      // faster; FOGIPC will move execution back to the main thread.
+      promise->UseDirectTaskDispatch(__func__);
+
+      mGMPThread->Dispatch(
+          NewRunnableMethod<ipc::ResolveCallback<bool>&&,
+                            ipc::RejectCallback&&>(
+              "GMPParent::SendTestTriggerMetrics", gmp,
+              static_cast<void (GMPParent::*)(
+                  mozilla::ipc::ResolveCallback<bool> && aResolve,
+                  mozilla::ipc::RejectCallback && aReject)>(
+                  &PGMPParent::SendTestTriggerMetrics),
+
+              [promise](bool aValue) {
+                promise->Resolve(std::move(aValue), __func__);
+              },
+              [promise](ipc::ResponseRejectReason&& aReason) {
+                promise->Reject(std::move(aReason), __func__);
+              }),
+          NS_DISPATCH_NORMAL);
+
+      return promise;
+    }
+  }
+
+  return PGMPParent::TestTriggerMetricsPromise::CreateAndReject(
+      ipc::ResponseRejectReason::SendError, __func__);
+}
+
+RefPtr<GenericPromise> GeckoMediaPluginServiceParent::AsyncAddPluginDirectory(
+    const nsAString& aDirectory) {
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  if (!thread) {
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  mDirectoriesAdded++;
+  mDirectoriesInProgress++;
+
+  nsString dir(aDirectory);
+  RefPtr<GeckoMediaPluginServiceParent> self = this;
+  return InvokeAsync(thread, this, __func__,
+                     &GeckoMediaPluginServiceParent::AddOnGMPThread, dir)
+      ->Then(
+          mMainThread, __func__,
+          [dir, self](bool aVal) {
+            GMP_LOG_DEBUG(
+                "GeckoMediaPluginServiceParent::AsyncAddPluginDirectory %s "
+                "succeeded",
+                NS_ConvertUTF16toUTF8(dir).get());
+            MOZ_ASSERT(NS_IsMainThread());
+            self->mDirectoriesInProgress--;
+            self->UpdateContentProcessGMPCapabilities();
+            return GenericPromise::CreateAndResolve(aVal, __func__);
+          },
+          [dir, self](nsresult aResult) {
+            GMP_LOG_DEBUG(
+                "GeckoMediaPluginServiceParent::AsyncAddPluginDirectory %s "
+                "failed",
+                NS_ConvertUTF16toUTF8(dir).get());
+            self->mDirectoriesInProgress--;
+            return GenericPromise::CreateAndReject(aResult, __func__);
+          });
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::AddPluginDirectory(const nsAString& aDirectory) {
+  MOZ_ASSERT(NS_IsMainThread());
+  RefPtr<GenericPromise> p = AsyncAddPluginDirectory(aDirectory);
+  Unused << p;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::RemovePluginDirectory(
+    const nsAString& aDirectory) {
+  MOZ_ASSERT(NS_IsMainThread());
+  return GMPDispatch(
+      new PathRunnable(this, aDirectory, PathRunnable::EOperation::REMOVE));
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::RemoveAndDeletePluginDirectory(
+    const nsAString& aDirectory, const bool aDefer) {
+  MOZ_ASSERT(NS_IsMainThread());
+  return GMPDispatch(new PathRunnable(
+      this, aDirectory, PathRunnable::EOperation::REMOVE_AND_DELETE_FROM_DISK,
+      aDefer));
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::HasPluginForAPI(const nsACString& aAPI,
+                                               nsTArray<nsCString>* aTags,
+                                               bool* aHasPlugin) {
+  NS_ENSURE_ARG(aTags && aTags->Length() > 0);
+  NS_ENSURE_ARG(aHasPlugin);
+
+  nsresult rv = EnsurePluginsOnDiskScanned();
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to load GMPs from disk.");
+    return rv;
+  }
+
+  {
+    MutexAutoLock lock(mMutex);
+    nsCString api(aAPI);
+    size_t index = 0;
+    RefPtr<GMPParent> gmp = FindPluginForAPIFrom(index, api, *aTags, &index);
+    *aHasPlugin = !!gmp;
+  }
+
+  return NS_OK;
+}
+
+nsresult GeckoMediaPluginServiceParent::EnsurePluginsOnDiskScanned() {
+  const char* env = nullptr;
+  if (!mScannedPluginOnDisk && (env = PR_GetEnv("MOZ_GMP_PATH")) && *env) {
+    // We have a MOZ_GMP_PATH environment variable which may specify the
+    // location of plugins to load, and we haven't yet scanned the disk to
+    // see if there are plugins there. Get the GMP thread, which will
+    // cause an event to be dispatched to which scans for plugins. We
+    // dispatch a sync event to the GMP thread here in order to wait until
+    // after the GMP thread has scanned any paths in MOZ_GMP_PATH.
+    nsresult rv = GMPDispatch(new mozilla::Runnable("GMPDummyRunnable"),
+                              NS_DISPATCH_SYNC);
+    NS_ENSURE_SUCCESS(rv, rv);
+    MOZ_ASSERT(mScannedPluginOnDisk, "Should have scanned MOZ_GMP_PATH by now");
+  }
+
+  return NS_OK;
+}
+
+already_AddRefed<GMPParent> GeckoMediaPluginServiceParent::FindPluginForAPIFrom(
+    size_t aSearchStartIndex, const nsACString& aAPI,
+    const nsTArray<nsCString>& aTags, size_t* aOutPluginIndex) {
+  mMutex.AssertCurrentThreadOwns();
+  for (size_t i = aSearchStartIndex; i < mPlugins.Length(); i++) {
+    RefPtr<GMPParent> gmp = mPlugins[i];
+    if (!GMPCapability::Supports(gmp->GetCapabilities(), aAPI, aTags)) {
+      continue;
+    }
+    if (aOutPluginIndex) {
+      *aOutPluginIndex = i;
+    }
+    return gmp.forget();
+  }
+  return nullptr;
+}
+
+already_AddRefed<GMPParent> GeckoMediaPluginServiceParent::SelectPluginForAPI(
+    const nsACString& aNodeId, const nsACString& aAPI,
+    const nsTArray<nsCString>& aTags) {
+  AssertOnGMPThread();
+
+  GMPParent* gmpToClone = nullptr;
+  {
+    MutexAutoLock lock(mMutex);
+    size_t index = 0;
+    RefPtr<GMPParent> gmp;
+    while ((gmp = FindPluginForAPIFrom(index, aAPI, aTags, &index))) {
+      if (aNodeId.IsEmpty()) {
+        if (gmp->CanBeSharedCrossNodeIds()) {
+          return gmp.forget();
+        }
+      } else if (gmp->CanBeUsedFrom(aNodeId)) {
+        return gmp.forget();
+      }
+
+      if (!gmpToClone ||
+          (gmpToClone->IsMarkedForDeletion() && !gmp->IsMarkedForDeletion())) {
+        // This GMP has the correct type but has the wrong nodeId; hold on to it
+        // in case we need to clone it.
+        // Prefer GMPs in-use for the case where an upgraded plugin version is
+        // waiting for the old one to die. If the old plugin is in use, we
+        // should continue using it so that any persistent state remains
+        // consistent. Otherwise, just check that the plugin isn't scheduled
+        // for deletion.
+        gmpToClone = gmp;
+      }
+      // Loop around and try the next plugin; it may be usable from aNodeId.
+      index++;
+    }
+  }
+
+  // Plugin exists, but we can't use it due to cross-origin separation. Create a
+  // new one.
+  if (gmpToClone) {
+    RefPtr<GMPParent> clone = ClonePlugin(gmpToClone);
+    {
+      MutexAutoLock lock(mMutex);
+      mPlugins.AppendElement(clone);
+    }
+    if (!aNodeId.IsEmpty()) {
+      clone->SetNodeId(aNodeId);
+    }
+    return clone.forget();
+  }
+
+  return nullptr;
+}
+
+static already_AddRefed<GMPParent> CreateGMPParent() {
+  // Should run on the GMP thread.
+#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+  if (!SandboxInfo::Get().CanSandboxMedia()) {
+    if (!StaticPrefs::media_gmp_insecure_allow()) {
+      NS_WARNING("Denying media plugin load due to lack of sandboxing.");
+      return nullptr;
+    }
+    NS_WARNING("Loading media plugin despite lack of sandboxing.");
+  }
+#endif
+  RefPtr<GMPParent> gmpParent = new GMPParent();
+  return gmpParent.forget();
+}
+
+already_AddRefed<GMPParent> GeckoMediaPluginServiceParent::ClonePlugin(
+    const GMPParent* aOriginal) {
+  AssertOnGMPThread();
+  MOZ_ASSERT(aOriginal);
+
+  RefPtr<GMPParent> gmp = CreateGMPParent();
+  if (!gmp) {
+    NS_WARNING("Can't Create GMPParent");
+    return nullptr;
+  }
+
+  gmp->CloneFrom(aOriginal);
+  return gmp.forget();
+}
+
+RefPtr<GenericPromise> GeckoMediaPluginServiceParent::AddOnGMPThread(
+    nsString aDirectory) {
+#ifdef XP_WIN
+  // On Windows our various test harnesses often pass paths with UNIX dir
+  // separators, or a mix of dir separators. NS_NewLocalFile() can't handle
+  // that, so fixup to match the platform's expected format. This makes us
+  // more robust in the face of bad input and test harnesses changing...
+  std::replace(aDirectory.BeginWriting(), aDirectory.EndWriting(), '/', '\\');
+#endif
+
+  AssertOnGMPThread();
+  nsCString dir = NS_ConvertUTF16toUTF8(aDirectory);
+  nsCOMPtr<nsISerialEventTarget> thread(GetGMPThread());
+  if (!thread) {
+    GMP_LOG_DEBUG("%s::%s: %s No GMP Thread", __CLASS__, __FUNCTION__,
+                  dir.get());
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+  GMP_LOG_DEBUG("%s::%s: %s", __CLASS__, __FUNCTION__, dir.get());
+
+  nsCOMPtr<nsIFile> directory;
+  nsresult rv = NS_NewLocalFile(aDirectory, false, getter_AddRefs(directory));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    GMP_LOG_DEBUG("%s::%s: failed to create nsIFile for dir=%s rv=%" PRIx32,
+                  __CLASS__, __FUNCTION__, dir.get(),
+                  static_cast<uint32_t>(rv));
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  RefPtr<GMPParent> gmp = CreateGMPParent();
+  if (!gmp) {
+    NS_WARNING("Can't Create GMPParent");
+    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+
+  RefPtr<GeckoMediaPluginServiceParent> self(this);
+  return gmp->Init(this, directory)
+      ->Then(
+          thread, __func__,
+          [gmp, self, dir](bool aVal) {
+            GMP_LOG_DEBUG("%s::%s: %s Succeeded", __CLASS__, __FUNCTION__,
+                          dir.get());
+            {
+              MutexAutoLock lock(self->mMutex);
+              self->mPlugins.AppendElement(gmp);
+            }
+            return GenericPromise::CreateAndResolve(aVal, __func__);
+          },
+          [dir](nsresult aResult) {
+            GMP_LOG_DEBUG("%s::%s: %s Failed", __CLASS__, __FUNCTION__,
+                          dir.get());
+            return GenericPromise::CreateAndReject(aResult, __func__);
+          });
+}
+
+void GeckoMediaPluginServiceParent::RemoveOnGMPThread(
+    const nsAString& aDirectory, const bool aDeleteFromDisk,
+    const bool aCanDefer) {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG("%s::%s: %s", __CLASS__, __FUNCTION__,
+                NS_LossyConvertUTF16toASCII(aDirectory).get());
+
+  nsCOMPtr<nsIFile> directory;
+  nsresult rv = NS_NewLocalFile(aDirectory, false, getter_AddRefs(directory));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  // Plugin destruction can modify |mPlugins|. Put them aside for now and
+  // destroy them once we're done with |mPlugins|.
+  nsTArray<RefPtr<GMPParent>> deadPlugins;
+
+  bool inUse = false;
+  MutexAutoLock lock(mMutex);
+  for (size_t i = mPlugins.Length(); i-- > 0;) {
+    nsCOMPtr<nsIFile> pluginpath = mPlugins[i]->GetDirectory();
+    bool equals;
+    if (NS_FAILED(directory->Equals(pluginpath, &equals)) || !equals) {
+      continue;
+    }
+
+    RefPtr<GMPParent> gmp = mPlugins[i];
+    if (aDeleteFromDisk && gmp->State() != GMPStateNotLoaded) {
+      // We have to wait for the child process to release its lib handle
+      // before we can delete the GMP.
+      inUse = true;
+      gmp->MarkForDeletion();
+
+      if (!mPluginsWaitingForDeletion.Contains(aDirectory)) {
+        mPluginsWaitingForDeletion.AppendElement(aDirectory);
+      }
+    }
+
+    if (gmp->State() == GMPStateNotLoaded || !aCanDefer) {
+      // GMP not in use or shutdown is being forced; can shut it down now.
+      deadPlugins.AppendElement(gmp);
+      mPlugins.RemoveElementAt(i);
+    }
+  }
+
+  {
+    MutexAutoUnlock unlock(mMutex);
+    for (auto& gmp : deadPlugins) {
+      gmp->CloseActive(true);
+    }
+  }
+
+  if (aDeleteFromDisk && !inUse) {
+    // Ensure the GMP dir and all files in it are writable, so we have
+    // permission to delete them.
+    directory->SetPermissions(0700);
+    DirectoryEnumerator iter(directory, DirectoryEnumerator::FilesAndDirs);
+    for (nsCOMPtr<nsIFile> dirEntry; (dirEntry = iter.Next()) != nullptr;) {
+      dirEntry->SetPermissions(0700);
+    }
+    if (NS_SUCCEEDED(directory->Remove(true))) {
+      mPluginsWaitingForDeletion.RemoveElement(aDirectory);
+      nsCOMPtr<nsIRunnable> task = new NotifyObserversTask(
+          "gmp-directory-deleted", nsString(aDirectory));
+      mMainThread->Dispatch(task.forget());
+    }
+  }
+}
+
+// May remove when Bug 1043671 is fixed
+static void Dummy(RefPtr<GMPParent> aOnDeathsDoor) {
+  // exists solely to do nothing and let the Runnable kill the GMPParent
+  // when done.
+}
+
+void GeckoMediaPluginServiceParent::PluginTerminated(
+    const RefPtr<GMPParent>& aPlugin) {
+  AssertOnGMPThread();
+
+  if (aPlugin->IsMarkedForDeletion()) {
+    nsString path;
+    RefPtr<nsIFile> dir = aPlugin->GetDirectory();
+    nsresult rv = dir->GetPath(path);
+    NS_ENSURE_SUCCESS_VOID(rv);
+    if (mPluginsWaitingForDeletion.Contains(path)) {
+      RemoveOnGMPThread(path, true /* delete */, true /* can defer */);
+    }
+  }
+}
+
+void GeckoMediaPluginServiceParent::ReAddOnGMPThread(
+    const RefPtr<GMPParent>& aOld) {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG("%s::%s: %p", __CLASS__, __FUNCTION__, (void*)aOld);
+
+  RefPtr<GMPParent> gmp;
+  if (!mShuttingDownOnGMPThread) {
+    // We're not shutting down, so replace the old plugin in the list with a
+    // clone which is in a pristine state. Note: We place the plugin in
+    // the same slot in the array as a hack to ensure if we re-request with
+    // the same capabilities we get an instance of the same plugin.
+    gmp = ClonePlugin(aOld);
+    MutexAutoLock lock(mMutex);
+    MOZ_ASSERT(mPlugins.Contains(aOld));
+    if (mPlugins.Contains(aOld)) {
+      mPlugins[mPlugins.IndexOf(aOld)] = gmp;
+    }
+  } else {
+    // We're shutting down; don't re-add plugin, let the old plugin die.
+    MutexAutoLock lock(mMutex);
+    mPlugins.RemoveElement(aOld);
+  }
+  // Schedule aOld to be destroyed.  We can't destroy it from here since we
+  // may be inside ActorDestroyed() for it.
+  NS_DispatchToCurrentThread(WrapRunnableNM(&Dummy, aOld));
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::GetStorageDir(nsIFile** aOutFile) {
+  if (NS_WARN_IF(!mStorageBaseDir)) {
+    return NS_ERROR_FAILURE;
+  }
+  return mStorageBaseDir->Clone(aOutFile);
+}
+
+nsresult WriteToFile(nsIFile* aPath, const nsACString& aFileName,
+                     const nsACString& aData) {
+  nsCOMPtr<nsIFile> path;
+  nsresult rv = aPath->Clone(getter_AddRefs(path));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = path->AppendNative(aFileName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  PRFileDesc* f = nullptr;
+  rv = path->OpenNSPRFileDesc(PR_WRONLY | PR_CREATE_FILE, PR_IRWXU, &f);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  int32_t len = PR_Write(f, aData.BeginReading(), aData.Length());
+  PR_Close(f);
+  if (NS_WARN_IF(len < 0 || (size_t)len != aData.Length())) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+static nsresult ReadFromFile(nsIFile* aPath, const nsACString& aFileName,
+                             nsACString& aOutData, int32_t aMaxLength) {
+  nsCOMPtr<nsIFile> path;
+  nsresult rv = aPath->Clone(getter_AddRefs(path));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = path->AppendNative(aFileName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  PRFileDesc* f = nullptr;
+  rv = path->OpenNSPRFileDesc(PR_RDONLY | PR_CREATE_FILE, PR_IRWXU, &f);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  auto size = PR_Seek(f, 0, PR_SEEK_END);
+  PR_Seek(f, 0, PR_SEEK_SET);
+
+  if (size > aMaxLength) {
+    return NS_ERROR_FAILURE;
+  }
+  aOutData.SetLength(size);
+
+  auto len = PR_Read(f, aOutData.BeginWriting(), size);
+  PR_Close(f);
+  if (NS_WARN_IF(len != size)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+nsresult ReadSalt(nsIFile* aPath, nsACString& aOutData) {
+  return ReadFromFile(aPath, "salt"_ns, aOutData, NodeIdSaltLength);
+}
+
+already_AddRefed<GMPStorage> GeckoMediaPluginServiceParent::GetMemoryStorageFor(
+    const nsACString& aNodeId) {
+  return do_AddRef(mTempGMPStorage.LookupOrInsertWith(
+      aNodeId, [] { return CreateGMPMemoryStorage(); }));
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::IsPersistentStorageAllowed(
+    const nsACString& aNodeId, bool* aOutAllowed) {
+  AssertOnGMPThread();
+  NS_ENSURE_ARG(aOutAllowed);
+  // We disallow persistent storage for the NodeId used for shared GMP
+  // decoding, to prevent GMP decoding being used to track what a user
+  // watches somehow.
+  *aOutAllowed = !aNodeId.Equals(SHARED_GMP_DECODING_NODE_ID) &&
+                 mPersistentStorageAllowed.Get(aNodeId);
+  return NS_OK;
+}
+
+nsresult GeckoMediaPluginServiceParent::GetNodeId(
+    const nsAString& aOrigin, const nsAString& aTopLevelOrigin,
+    const nsAString& aGMPName, nsACString& aOutId) {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG("%s::%s: (%s, %s)", __CLASS__, __FUNCTION__,
+                NS_ConvertUTF16toUTF8(aOrigin).get(),
+                NS_ConvertUTF16toUTF8(aTopLevelOrigin).get());
+
+  nsresult rv;
+
+  if (aOrigin.EqualsLiteral("null") || aOrigin.IsEmpty() ||
+      aTopLevelOrigin.EqualsLiteral("null") || aTopLevelOrigin.IsEmpty()) {
+    // (origin, topLevelOrigin) is null or empty; this is for an anonymous
+    // origin, probably a local file, for which we don't provide persistent
+    // storage. Generate a random node id, and don't store it so that the GMP's
+    // storage is temporary and the process for this GMP is not shared with GMP
+    // instances that have the same nodeId.
+    nsAutoCString salt;
+    rv = GenerateRandomPathName(salt, NodeIdSaltLength);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    aOutId = salt;
+    mPersistentStorageAllowed.InsertOrUpdate(salt, false);
+    return NS_OK;
+  }
+
+  const uint32_t hash =
+      AddToHash(HashString(aOrigin), HashString(aTopLevelOrigin));
+
+  if (OriginAttributes::IsPrivateBrowsing(NS_ConvertUTF16toUTF8(aOrigin))) {
+    // For PB mode, we store the node id, indexed by the origin pair and GMP
+    // name, so that if the same origin pair is opened for the same GMP in this
+    // session, it gets the same node id.
+    const uint32_t pbHash = AddToHash(HashString(aGMPName), hash);
+    return mTempNodeIds.WithEntryHandle(pbHash, [&](auto&& entry) {
+      if (!entry) {
+        // No salt stored, generate and temporarily store some for this id.
+        nsAutoCString newSalt;
+        rv = GenerateRandomPathName(newSalt, NodeIdSaltLength);
+        if (NS_WARN_IF(NS_FAILED(rv))) {
+          return rv;
+        }
+        auto salt = MakeUnique<nsCString>(newSalt);
+
+        mPersistentStorageAllowed.InsertOrUpdate(*salt, false);
+
+        entry.Insert(std::move(salt));
+      }
+
+      aOutId = *entry.Data();
+      return NS_OK;
+    });
+  }
+
+  // Otherwise, try to see if we've previously generated and stored salt
+  // for this origin pair.
+  nsCOMPtr<nsIFile> path;  // $profileDir/gmp/$platform/
+  rv = GetStorageDir(getter_AddRefs(path));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // $profileDir/gmp/$platform/$gmpName/
+  rv = path->Append(aGMPName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // $profileDir/gmp/$platform/$gmpName/id/
+  rv = path->AppendNative("id"_ns);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoCString hashStr;
+  hashStr.AppendInt((int64_t)hash);
+
+  // $profileDir/gmp/$platform/$gmpName/id/$hash
+  rv = path->AppendNative(hashStr);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = path->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  if (rv != NS_ERROR_FILE_ALREADY_EXISTS && NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIFile> saltFile;
+  rv = path->Clone(getter_AddRefs(saltFile));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  rv = saltFile->AppendNative("salt"_ns);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsAutoCString salt;
+  bool exists = false;
+  rv = saltFile->Exists(&exists);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  if (!exists) {
+    // No stored salt for this origin. Generate salt, and store it and
+    // the origin on disk.
+    nsresult rv = GenerateRandomPathName(salt, NodeIdSaltLength);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+    MOZ_ASSERT(salt.Length() == NodeIdSaltLength);
+
+    // $profileDir/gmp/$platform/$gmpName/id/$hash/salt
+    rv = WriteToFile(path, "salt"_ns, salt);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    // $profileDir/gmp/$platform/$gmpName/id/$hash/origin
+    rv = WriteToFile(path, "origin"_ns, NS_ConvertUTF16toUTF8(aOrigin));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    // $profileDir/gmp/$platform/$gmpName/id/$hash/topLevelOrigin
+    rv = WriteToFile(path, "topLevelOrigin"_ns,
+                     NS_ConvertUTF16toUTF8(aTopLevelOrigin));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+  } else {
+    rv = ReadSalt(path, salt);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  aOutId = salt;
+  mPersistentStorageAllowed.InsertOrUpdate(salt, true);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::GetNodeId(
+    const nsAString& aOrigin, const nsAString& aTopLevelOrigin,
+    const nsAString& aGMPName, UniquePtr<GetNodeIdCallback>&& aCallback) {
+  nsCString nodeId;
+  nsresult rv = GetNodeId(aOrigin, aTopLevelOrigin, aGMPName, nodeId);
+  aCallback->Done(rv, nodeId);
+  return rv;
+}
+
+nsresult GeckoMediaPluginServiceParent::GetNodeId(
+    const NodeIdVariant& aNodeIdVariant, nsACString& aOutId) {
+  if (aNodeIdVariant.type() == NodeIdVariant::TnsCString) {
+    // The union already contains a node ID as a string, use that.
+    aOutId = aNodeIdVariant.get_nsCString();
+    return NS_OK;
+  }
+  // The union contains a NodeIdParts, convert it to a node ID string.
+  NodeIdParts nodeIdParts{aNodeIdVariant.get_NodeIdParts()};
+  return GetNodeId(nodeIdParts.mOrigin(), nodeIdParts.mTopLevelOrigin(),
+                   nodeIdParts.mGMPName(), aOutId);
+}
+
+static bool ExtractHostName(const nsACString& aOrigin, nsACString& aOutData) {
+  nsCString str;
+  str.Assign(aOrigin);
+  int begin = str.Find("://");
+  // The scheme is missing!
+  if (begin == -1) {
+    return false;
+  }
+
+  int end = str.RFind(":");
+  // Remove the port number
+  if (end != begin) {
+    str.SetLength(end);
+  }
+
+  nsDependentCSubstring host(str, begin + 3);
+  aOutData.Assign(host);
+  return true;
+}
+
+constexpr uint32_t kMaxDomainLength = 253;
+// http://en.wikipedia.org/wiki/Domain_Name_System#Domain_name_syntax
+
+constexpr std::array<nsLiteralCString, 2> kFileNames = {"origin"_ns,
+                                                        "topLevelOrigin"_ns};
+
+bool MatchOrigin(nsIFile* aPath, const nsACString& aSite,
+                 const mozilla::OriginAttributesPattern& aPattern) {
+  nsresult rv;
+  nsCString str;
+  nsCString originNoSuffix;
+  for (const auto& fileName : kFileNames) {
+    rv = ReadFromFile(aPath, fileName, str, kMaxDomainLength);
+    mozilla::OriginAttributes originAttributes;
+    if (NS_FAILED(rv) ||
+        !originAttributes.PopulateFromOrigin(str, originNoSuffix)) {
+      // Fails on parsing the originAttributes, treat this as a non-match.
+      return false;
+    }
+
+    if (ExtractHostName(originNoSuffix, str) && str.Equals(aSite) &&
+        aPattern.Matches(originAttributes)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+bool MatchBaseDomain(nsIFile* aPath, const nsACString& aBaseDomain) {
+  nsresult rv;
+  nsCString fileContent;
+  nsCString originNoSuffix;
+  for (const auto& fileName : kFileNames) {
+    rv = ReadFromFile(aPath, fileName, fileContent, kMaxDomainLength);
+    mozilla::OriginAttributes originAttributes;
+    if (NS_FAILED(rv) ||
+        !originAttributes.PopulateFromOrigin(fileContent, originNoSuffix)) {
+      // Fails on parsing the originAttributes, treat this as a non-match.
+      return false;
+    }
+    nsCString originHostname;
+    if (!ExtractHostName(originNoSuffix, originHostname)) {
+      return false;
+    }
+    bool success;
+    rv = net::HasRootDomain(originHostname, aBaseDomain, &success);
+    if (NS_SUCCEEDED(rv) && success) {
+      return true;
+    }
+  }
+  return false;
+}
+
+template <typename T>
+static void KillPlugins(const nsTArray<RefPtr<GMPParent>>& aPlugins,
+                        Mutex& aMutex, T&& aFilter) {
+  // Shutdown the plugins when |aFilter| evaluates to true.
+  // After we clear storage data, node IDs will become invalid and shouldn't be
+  // used anymore. We need to kill plugins with such nodeIDs.
+  // Note: we can't shut them down while holding the lock,
+  // as the lock is not re-entrant and shutdown requires taking the lock.
+  // The plugin list is only edited on the GMP thread, so this should be OK.
+  nsTArray<RefPtr<GMPParent>> pluginsToKill;
+  {
+    MutexAutoLock lock(aMutex);
+    for (size_t i = 0; i < aPlugins.Length(); i++) {
+      RefPtr<GMPParent> parent(aPlugins[i]);
+      if (aFilter(parent)) {
+        pluginsToKill.AppendElement(parent);
+      }
+    }
+  }
+
+  for (size_t i = 0; i < pluginsToKill.Length(); i++) {
+    pluginsToKill[i]->CloseActive(false);
+  }
+}
+
+struct NodeFilter {
+  explicit NodeFilter(const nsTArray<nsCString>& nodeIDs) : mNodeIDs(nodeIDs) {}
+  bool operator()(GMPParent* aParent) {
+    return mNodeIDs.Contains(aParent->GetNodeId());
+  }
+
+ private:
+  const nsTArray<nsCString>& mNodeIDs;
+};
+
+void GeckoMediaPluginServiceParent::ClearNodeIdAndPlugin(
+    DirectoryFilter& aFilter) {
+  // $profileDir/gmp/$platform/
+  nsCOMPtr<nsIFile> path;
+  nsresult rv = GetStorageDir(getter_AddRefs(path));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  // Iterate all sub-folders of $profileDir/gmp/$platform/, i.e. the dirs in
+  // which specific GMPs store their data.
+  DirectoryEnumerator iter(path, DirectoryEnumerator::DirsOnly);
+  for (nsCOMPtr<nsIFile> pluginDir; (pluginDir = iter.Next()) != nullptr;) {
+    ClearNodeIdAndPlugin(pluginDir, aFilter);
+  }
+}
+
+void GeckoMediaPluginServiceParent::ClearNodeIdAndPlugin(
+    nsIFile* aPluginStorageDir, DirectoryFilter& aFilter) {
+  // $profileDir/gmp/$platform/$gmpName/id/
+  nsCOMPtr<nsIFile> path = CloneAndAppend(aPluginStorageDir, u"id"_ns);
+  if (!path) {
+    return;
+  }
+
+  // Iterate all sub-folders of $profileDir/gmp/$platform/$gmpName/id/
+  nsTArray<nsCString> nodeIDsToClear;
+  DirectoryEnumerator iter(path, DirectoryEnumerator::DirsOnly);
+  for (nsCOMPtr<nsIFile> dirEntry; (dirEntry = iter.Next()) != nullptr;) {
+    // dirEntry is the hash of origins, i.e.:
+    // $profileDir/gmp/$platform/$gmpName/id/$originHash/
+    if (!aFilter(dirEntry)) {
+      continue;
+    }
+    nsAutoCString salt;
+    if (NS_SUCCEEDED(ReadSalt(dirEntry, salt))) {
+      // Keep node IDs to clear data/plugins associated with them later.
+      nodeIDsToClear.AppendElement(salt);
+      // Also remove node IDs from the table.
+      mPersistentStorageAllowed.Remove(salt);
+    }
+    // Now we can remove the directory for the origin pair.
+    if (NS_FAILED(dirEntry->Remove(true))) {
+      NS_WARNING("Failed to delete the directory for the origin pair");
+    }
+  }
+
+  // Kill plugin instances that have node IDs being cleared.
+  KillPlugins(mPlugins, mMutex, NodeFilter(nodeIDsToClear));
+
+  // Clear all storage in $profileDir/gmp/$platform/$gmpName/storage/$nodeId/
+  path = CloneAndAppend(aPluginStorageDir, u"storage"_ns);
+  if (!path) {
+    return;
+  }
+
+  for (const nsACString& nodeId : nodeIDsToClear) {
+    nsCOMPtr<nsIFile> dirEntry;
+    nsresult rv = path->Clone(getter_AddRefs(dirEntry));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      continue;
+    }
+
+    rv = dirEntry->AppendNative(nodeId);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      continue;
+    }
+
+    if (NS_FAILED(dirEntry->Remove(true))) {
+      NS_WARNING("Failed to delete GMP storage directory for the node");
+    }
+  }
+}
+
+void GeckoMediaPluginServiceParent::ForgetThisSiteOnGMPThread(
+    const nsACString& aSite, const mozilla::OriginAttributesPattern& aPattern) {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG("%s::%s: origin=%s", __CLASS__, __FUNCTION__, aSite.Data());
+
+  struct OriginFilter : public DirectoryFilter {
+    explicit OriginFilter(const nsACString& aSite,
+                          const mozilla::OriginAttributesPattern& aPattern)
+        : mSite(aSite), mPattern(aPattern) {}
+    bool operator()(nsIFile* aPath) override {
+      return MatchOrigin(aPath, mSite, mPattern);
+    }
+
+   private:
+    const nsACString& mSite;
+    const mozilla::OriginAttributesPattern& mPattern;
+  } filter(aSite, aPattern);
+
+  ClearNodeIdAndPlugin(filter);
+}
+
+void GeckoMediaPluginServiceParent::ForgetThisBaseDomainOnGMPThread(
+    const nsACString& aBaseDomain) {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG("%s::%s: baseDomain=%s", __CLASS__, __FUNCTION__,
+                aBaseDomain.Data());
+
+  struct BaseDomainFilter : public DirectoryFilter {
+    explicit BaseDomainFilter(const nsACString& aBaseDomain)
+        : mBaseDomain(aBaseDomain) {}
+    bool operator()(nsIFile* aPath) override {
+      return MatchBaseDomain(aPath, mBaseDomain);
+    }
+
+   private:
+    const nsACString& mBaseDomain;
+  } filter(aBaseDomain);
+
+  ClearNodeIdAndPlugin(filter);
+}
+
+void GeckoMediaPluginServiceParent::ClearRecentHistoryOnGMPThread(
+    PRTime aSince) {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG("%s::%s: since=%" PRId64, __CLASS__, __FUNCTION__,
+                (int64_t)aSince);
+
+  struct MTimeFilter : public DirectoryFilter {
+    explicit MTimeFilter(PRTime aSince) : mSince(aSince) {}
+
+    // Return true if any files under aPath is modified after |mSince|.
+    bool IsModifiedAfter(nsIFile* aPath) {
+      PRTime lastModified;
+      nsresult rv = aPath->GetLastModifiedTime(&lastModified);
+      if (NS_SUCCEEDED(rv) && lastModified >= mSince) {
+        return true;
+      }
+      DirectoryEnumerator iter(aPath, DirectoryEnumerator::FilesAndDirs);
+      for (nsCOMPtr<nsIFile> dirEntry; (dirEntry = iter.Next()) != nullptr;) {
+        if (IsModifiedAfter(dirEntry)) {
+          return true;
+        }
+      }
+      return false;
+    }
+
+    // |aPath| is $profileDir/gmp/$platform/$gmpName/id/$originHash/
+    bool operator()(nsIFile* aPath) override {
+      if (IsModifiedAfter(aPath)) {
+        return true;
+      }
+
+      nsAutoCString salt;
+      if (NS_WARN_IF(NS_FAILED(ReadSalt(aPath, salt)))) {
+        return false;
+      }
+
+      // $profileDir/gmp/$platform/$gmpName/id/
+      nsCOMPtr<nsIFile> idDir;
+      if (NS_WARN_IF(NS_FAILED(aPath->GetParent(getter_AddRefs(idDir))))) {
+        return false;
+      }
+      // $profileDir/gmp/$platform/$gmpName/
+      nsCOMPtr<nsIFile> temp;
+      if (NS_WARN_IF(NS_FAILED(idDir->GetParent(getter_AddRefs(temp))))) {
+        return false;
+      }
+
+      // $profileDir/gmp/$platform/$gmpName/storage/
+      if (NS_WARN_IF(NS_FAILED(temp->Append(u"storage"_ns)))) {
+        return false;
+      }
+      // $profileDir/gmp/$platform/$gmpName/storage/$originSalt
+      return NS_SUCCEEDED(temp->AppendNative(salt)) && IsModifiedAfter(temp);
+    }
+
+   private:
+    const PRTime mSince;
+  } filter(aSince);
+
+  ClearNodeIdAndPlugin(filter);
+
+  nsCOMPtr<nsIRunnable> task =
+      new NotifyObserversTask("gmp-clear-storage-complete");
+  mMainThread->Dispatch(task.forget());
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::ForgetThisSite(const nsAString& aSite,
+                                              const nsAString& aPattern) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  mozilla::OriginAttributesPattern pattern;
+
+  if (!pattern.Init(aPattern)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  return ForgetThisSiteNative(aSite, pattern);
+}
+
+nsresult GeckoMediaPluginServiceParent::ForgetThisSiteNative(
+    const nsAString& aSite, const mozilla::OriginAttributesPattern& aPattern) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  return GMPDispatch(
+      NewRunnableMethod<nsCString, mozilla::OriginAttributesPattern>(
+          "gmp::GeckoMediaPluginServiceParent::ForgetThisSiteOnGMPThread", this,
+          &GeckoMediaPluginServiceParent::ForgetThisSiteOnGMPThread,
+          NS_ConvertUTF16toUTF8(aSite), aPattern));
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::ForgetThisBaseDomain(
+    const nsAString& aBaseDomain) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  return ForgetThisBaseDomainNative(aBaseDomain);
+}
+
+nsresult GeckoMediaPluginServiceParent::ForgetThisBaseDomainNative(
+    const nsAString& aBaseDomain) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  return GMPDispatch(NewRunnableMethod<nsCString>(
+      "gmp::GeckoMediaPluginServiceParent::ForgetThisBaseDomainOnGMPThread",
+      this, &GeckoMediaPluginServiceParent::ForgetThisBaseDomainOnGMPThread,
+      NS_ConvertUTF16toUTF8(aBaseDomain)));
+}
+
+static bool IsNodeIdValid(GMPParent* aParent) {
+  return !aParent->GetNodeId().IsEmpty();
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::GetName(nsAString& aName) {
+  aName = u"GeckoMediaPluginServiceParent: shutdown"_ns;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::GetState(nsIPropertyBag**) { return NS_OK; }
+
+NS_IMETHODIMP
+GeckoMediaPluginServiceParent::BlockShutdown(nsIAsyncShutdownClient*) {
+  return NS_OK;
+}
+
+// Called from GMPServiceParent::Create() which holds the lock
+void GeckoMediaPluginServiceParent::ServiceUserCreated(
+    GMPServiceParent* aServiceParent) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mMutex.AssertCurrentThreadOwns();
+
+  MOZ_ASSERT(!mServiceParents.Contains(aServiceParent));
+  mServiceParents.AppendElement(aServiceParent);
+  if (mServiceParents.Length() == 1) {
+    nsresult rv = GetShutdownBarrier()->AddBlocker(
+        this, NS_LITERAL_STRING_FROM_CSTRING(__FILE__), __LINE__,
+        u"GeckoMediaPluginServiceParent shutdown"_ns);
+    MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
+  }
+}
+
+void GeckoMediaPluginServiceParent::ServiceUserDestroyed(
+    GMPServiceParent* aServiceParent) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MutexAutoLock lock(mMutex);
+  MOZ_ASSERT(mServiceParents.Length() > 0);
+  MOZ_ASSERT(mServiceParents.Contains(aServiceParent));
+  mServiceParents.RemoveElement(aServiceParent);
+  if (mServiceParents.IsEmpty()) {
+    nsresult rv = GetShutdownBarrier()->RemoveBlocker(this);
+    MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
+  }
+}
+
+void GeckoMediaPluginServiceParent::ClearStorage() {
+  AssertOnGMPThread();
+  GMP_LOG_DEBUG("%s::%s", __CLASS__, __FUNCTION__);
+
+  // Kill plugins with valid nodeIDs.
+  KillPlugins(mPlugins, mMutex, &IsNodeIdValid);
+
+  nsCOMPtr<nsIFile> path;  // $profileDir/gmp/$platform/
+  nsresult rv = GetStorageDir(getter_AddRefs(path));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  if (NS_FAILED(path->Remove(true))) {
+    NS_WARNING("Failed to delete GMP storage directory");
+  }
+
+  // Clear private-browsing storage.
+  mTempGMPStorage.Clear();
+
+  nsCOMPtr<nsIRunnable> task =
+      new NotifyObserversTask("gmp-clear-storage-complete");
+  mMainThread->Dispatch(task.forget());
+}
+
+already_AddRefed<GMPParent> GeckoMediaPluginServiceParent::GetById(
+    uint32_t aPluginId) {
+  MutexAutoLock lock(mMutex);
+  for (const RefPtr<GMPParent>& gmp : mPlugins) {
+    if (gmp->GetPluginId() == aPluginId) {
+      return do_AddRef(gmp);
+    }
+  }
+  return nullptr;
+}
+
+GMPServiceParent::GMPServiceParent(GeckoMediaPluginServiceParent* aService)
+    : mService(aService) {
+  MOZ_ASSERT(NS_IsMainThread(), "Should be constructed on the main thread");
+  MOZ_ASSERT(mService);
+  mService->ServiceUserCreated(this);
+}
+
+GMPServiceParent::~GMPServiceParent() {
+  MOZ_ASSERT(NS_IsMainThread(), "Should be destroyted on the main thread");
+  MOZ_ASSERT(mService);
+  mService->ServiceUserDestroyed(this);
+}
+
+mozilla::ipc::IPCResult GMPServiceParent::RecvLaunchGMP(
+    const NodeIdVariant& aNodeIdVariant, const nsACString& aAPI,
+    nsTArray<nsCString>&& aTags, nsTArray<ProcessId>&& aAlreadyBridgedTo,
+    uint32_t* aOutPluginId, ProcessId* aOutProcessId,
+    nsCString* aOutDisplayName, Endpoint<PGMPContentParent>* aOutEndpoint,
+    nsresult* aOutRv, nsCString* aOutErrorDescription) {
+  if (mService->IsShuttingDown()) {
+    *aOutRv = NS_ERROR_ILLEGAL_DURING_SHUTDOWN;
+    *aOutErrorDescription = "Service is shutting down."_ns;
+    return IPC_OK();
+  }
+
+  nsCString nodeIdString;
+  nsresult rv = mService->GetNodeId(aNodeIdVariant, nodeIdString);
+  if (!NS_SUCCEEDED(rv)) {
+    *aOutRv = rv;
+    *aOutErrorDescription = "GetNodeId failed."_ns;
+    return IPC_OK();
+  }
+
+  RefPtr<GMPParent> gmp =
+      mService->SelectPluginForAPI(nodeIdString, aAPI, aTags);
+  if (gmp) {
+    *aOutPluginId = gmp->GetPluginId();
+  } else {
+    *aOutRv = NS_ERROR_FAILURE;
+    *aOutErrorDescription = "SelectPluginForAPI returns nullptr."_ns;
+    *aOutPluginId = 0;
+    return IPC_OK();
+  }
+
+  if (!gmp->EnsureProcessLoaded(aOutProcessId)) {
+    *aOutRv = NS_ERROR_FAILURE;
+    *aOutErrorDescription = "Process has not loaded."_ns;
+    return IPC_OK();
+  }
+
+  *aOutDisplayName = gmp->GetDisplayName();
+
+  if (aAlreadyBridgedTo.Contains(*aOutProcessId)) {
+    *aOutRv = NS_OK;
+    return IPC_OK();
+  }
+
+  Endpoint<PGMPContentParent> parent;
+  Endpoint<PGMPContentChild> child;
+  rv =
+      PGMPContent::CreateEndpoints(OtherPid(), *aOutProcessId, &parent, &child);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    *aOutRv = rv;
+    *aOutErrorDescription = "PGMPContent::CreateEndpoints failed."_ns;
+    return IPC_OK();
+  }
+
+  *aOutEndpoint = std::move(parent);
+
+  if (!gmp->SendInitGMPContentChild(std::move(child))) {
+    *aOutRv = NS_ERROR_FAILURE;
+    *aOutErrorDescription = "SendInitGMPContentChild failed."_ns;
+    return IPC_OK();
+  }
+
+  gmp->IncrementGMPContentChildCount();
+
+  *aOutRv = NS_OK;
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPServiceParent::RecvGetGMPNodeId(
+    const nsAString& aOrigin, const nsAString& aTopLevelOrigin,
+    const nsAString& aGMPName, nsCString* aID) {
+  nsresult rv = mService->GetNodeId(aOrigin, aTopLevelOrigin, aGMPName, *aID);
+  if (!NS_SUCCEEDED(rv)) {
+    return IPC_FAIL(
+        this,
+        "GMPServiceParent::RecvGetGMPNodeId: mService->GetNodeId failed.");
+  }
+  return IPC_OK();
+}
+
+class OpenPGMPServiceParent : public mozilla::Runnable {
+ public:
+  OpenPGMPServiceParent(RefPtr<GMPServiceParent>&& aGMPServiceParent,
+                        ipc::Endpoint<PGMPServiceParent>&& aEndpoint,
+                        bool* aResult)
+      : Runnable("gmp::OpenPGMPServiceParent"),
+        mGMPServiceParent(aGMPServiceParent),
+        mEndpoint(std::move(aEndpoint)),
+        mResult(aResult) {}
+
+  NS_IMETHOD Run() override {
+    *mResult = mEndpoint.Bind(mGMPServiceParent);
+    return NS_OK;
+  }
+
+ private:
+  RefPtr<GMPServiceParent> mGMPServiceParent;
+  ipc::Endpoint<PGMPServiceParent> mEndpoint;
+  bool* mResult;
+};
+
+/* static */
+bool GMPServiceParent::Create(Endpoint<PGMPServiceParent>&& aGMPService) {
+  RefPtr<GeckoMediaPluginServiceParent> gmp =
+      GeckoMediaPluginServiceParent::GetSingleton();
+
+  if (gmp->mShuttingDown) {
+    // Shutdown is initiated. There is no point creating a new actor.
+    return false;
+  }
+
+  nsCOMPtr<nsIThread> gmpThread;
+  RefPtr<GMPServiceParent> serviceParent;
+  {
+    MutexAutoLock lock(gmp->mMutex);
+    nsresult rv = gmp->GetThreadLocked(getter_AddRefs(gmpThread));
+    NS_ENSURE_SUCCESS(rv, false);
+    serviceParent = new GMPServiceParent(gmp);
+  }
+  bool ok;
+  nsresult rv = gmpThread->Dispatch(
+      new OpenPGMPServiceParent(std::move(serviceParent),
+                                std::move(aGMPService), &ok),
+      NS_DISPATCH_SYNC);
+
+  if (NS_WARN_IF(NS_FAILED(rv) || !ok)) {
+    return false;
+  }
+
+  // Now that the service parent is set up, it will be released by IPC
+  // refcounting, so we don't need to hold any more references here.
+
+  return true;
+}
+
+}  // namespace mozilla::gmp
+
+#undef __CLASS__
diff --git a/dom/media/gmp/GMPServiceParent.h b/dom/media/gmp/GMPServiceParent.h
new file mode 100644
index 0000000000..88fb3ba528
--- /dev/null
+++ b/dom/media/gmp/GMPServiceParent.h
@@ -0,0 +1,279 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPServiceParent_h_
+#define GMPServiceParent_h_
+
+#include "GMPService.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/gmp/PGMPServiceParent.h"
+#include "mozIGeckoMediaPluginChromeService.h"
+#include "nsClassHashtable.h"
+#include "nsTHashMap.h"
+#include "mozilla/Atomics.h"
+#include "nsNetUtil.h"
+#include "nsIAsyncShutdown.h"
+#include "nsRefPtrHashtable.h"
+#include "nsThreadUtils.h"
+#include "mozilla/gmp/PGMPParent.h"
+#include "mozilla/MozPromise.h"
+#include "GMPStorage.h"
+
+template <class>
+struct already_AddRefed;
+using FlushFOGDataPromise = mozilla::dom::ContentParent::FlushFOGDataPromise;
+using ContentParent = mozilla::dom::ContentParent;
+
+namespace mozilla {
+class OriginAttributesPattern;
+
+namespace gmp {
+
+class GMPParent;
+class GMPServiceParent;
+
+class GeckoMediaPluginServiceParent final
+    : public GeckoMediaPluginService,
+      public mozIGeckoMediaPluginChromeService,
+      public nsIAsyncShutdownBlocker {
+ public:
+  static already_AddRefed<GeckoMediaPluginServiceParent> GetSingleton();
+
+  GeckoMediaPluginServiceParent();
+  nsresult Init() override;
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIASYNCSHUTDOWNBLOCKER
+
+  // mozIGeckoMediaPluginService
+  NS_IMETHOD HasPluginForAPI(const nsACString& aAPI, nsTArray<nsCString>* aTags,
+                             bool* aRetVal) override;
+  NS_IMETHOD GetNodeId(const nsAString& aOrigin,
+                       const nsAString& aTopLevelOrigin,
+                       const nsAString& aGMPName,
+                       UniquePtr<GetNodeIdCallback>&& aCallback) override;
+
+  NS_DECL_MOZIGECKOMEDIAPLUGINCHROMESERVICE
+  NS_DECL_NSIOBSERVER
+
+  RefPtr<GenericPromise> EnsureInitialized();
+  RefPtr<GenericPromise> AsyncAddPluginDirectory(const nsAString& aDirectory);
+
+  // GMP thread access only
+  bool IsShuttingDown();
+
+  already_AddRefed<GMPStorage> GetMemoryStorageFor(const nsACString& aNodeId);
+  nsresult ForgetThisSiteNative(
+      const nsAString& aSite, const mozilla::OriginAttributesPattern& aPattern);
+
+  nsresult ForgetThisBaseDomainNative(const nsAString& aBaseDomain);
+
+  // Notifies that some user of this class is created/destroyed.
+  void ServiceUserCreated(GMPServiceParent* aServiceParent);
+  void ServiceUserDestroyed(GMPServiceParent* aServiceParent);
+
+  // If aContentProcess is specified, this will only update GMP caps in that
+  // content process, otherwise will update all content processes.
+  void UpdateContentProcessGMPCapabilities(
+      ContentParent* aContentProcess = nullptr);
+
+  void SendFlushFOGData(nsTArray<RefPtr<FlushFOGDataPromise>>& promises);
+
+  /*
+   * ** Test-only Method **
+   *
+   * Trigger GMP-process test metric instrumentation.
+   */
+  RefPtr<PGMPParent::TestTriggerMetricsPromise> TestTriggerMetrics();
+
+ private:
+  friend class GMPServiceParent;
+
+  virtual ~GeckoMediaPluginServiceParent();
+
+  void ClearStorage();
+
+  already_AddRefed<GMPParent> SelectPluginForAPI(
+      const nsACString& aNodeId, const nsACString& aAPI,
+      const nsTArray<nsCString>& aTags);
+
+  already_AddRefed<GMPParent> FindPluginForAPIFrom(
+      size_t aSearchStartIndex, const nsACString& aAPI,
+      const nsTArray<nsCString>& aTags, size_t* aOutPluginIndex);
+
+  nsresult GetNodeId(const nsAString& aOrigin, const nsAString& aTopLevelOrigin,
+                     const nsAString& aGMPName, nsACString& aOutId);
+
+  void UnloadPlugins();
+  void CrashPlugins();
+  void NotifySyncShutdownComplete();
+
+  void RemoveOnGMPThread(const nsAString& aDirectory,
+                         const bool aDeleteFromDisk, const bool aCanDefer);
+
+  struct DirectoryFilter {
+    virtual bool operator()(nsIFile* aPath) = 0;
+    ~DirectoryFilter() = default;
+  };
+  void ClearNodeIdAndPlugin(DirectoryFilter& aFilter);
+  void ClearNodeIdAndPlugin(nsIFile* aPluginStorageDir,
+                            DirectoryFilter& aFilter);
+  void ForgetThisSiteOnGMPThread(
+      const nsACString& aSite,
+      const mozilla::OriginAttributesPattern& aPattern);
+  void ForgetThisBaseDomainOnGMPThread(const nsACString& aBaseDomain);
+  void ClearRecentHistoryOnGMPThread(PRTime aSince);
+
+  already_AddRefed<GMPParent> GetById(uint32_t aPluginId);
+
+ protected:
+  friend class GMPParent;
+  void ReAddOnGMPThread(const RefPtr<GMPParent>& aOld);
+  void PluginTerminated(const RefPtr<GMPParent>& aOld);
+  void InitializePlugins(nsISerialEventTarget* GMPThread) override;
+  RefPtr<GenericPromise> LoadFromEnvironment();
+  RefPtr<GenericPromise> AddOnGMPThread(nsString aDirectory);
+
+  RefPtr<GetGMPContentParentPromise> GetContentParent(
+      GMPCrashHelper* aHelper, const NodeIdVariant& aNodeIdVariant,
+      const nsACString& aAPI, const nsTArray<nsCString>& aTags) override;
+
+ private:
+  // Creates a copy of aOriginal. Note that the caller is responsible for
+  // adding this to GeckoMediaPluginServiceParent::mPlugins.
+  already_AddRefed<GMPParent> ClonePlugin(const GMPParent* aOriginal);
+  nsresult EnsurePluginsOnDiskScanned();
+  nsresult InitStorage();
+
+  // Get a string based node ID from a NodeIdVariant. This will
+  // either fetch the internal string, or convert the internal NodeIdParts to a
+  // string. The conversion process is fallible, so the return value should be
+  // checked.
+  nsresult GetNodeId(const NodeIdVariant& aNodeIdVariant, nsACString& aOutId);
+
+  class PathRunnable : public Runnable {
+   public:
+    enum EOperation {
+      REMOVE,
+      REMOVE_AND_DELETE_FROM_DISK,
+    };
+
+    PathRunnable(GeckoMediaPluginServiceParent* aService,
+                 const nsAString& aPath, EOperation aOperation,
+                 bool aDefer = false)
+        : Runnable("gmp::GeckoMediaPluginServiceParent::PathRunnable"),
+          mService(aService),
+          mPath(aPath),
+          mOperation(aOperation),
+          mDefer(aDefer) {}
+
+    NS_DECL_NSIRUNNABLE
+
+   private:
+    RefPtr<GeckoMediaPluginServiceParent> mService;
+    nsString mPath;
+    EOperation mOperation;
+    bool mDefer;
+  };
+
+  // Protected by mMutex from the base class.
+  nsTArray<RefPtr<GMPParent>> mPlugins;
+
+  // True if we've inspected MOZ_GMP_PATH on the GMP thread and loaded any
+  // plugins found there into mPlugins.
+  Atomic<bool> mScannedPluginOnDisk;
+
+  template <typename T>
+  class MainThreadOnly {
+   public:
+    MOZ_IMPLICIT MainThreadOnly(T aValue) : mValue(aValue) {}
+    operator T&() {
+      MOZ_ASSERT(NS_IsMainThread());
+      return mValue;
+    }
+
+   private:
+    T mValue;
+  };
+
+  MainThreadOnly<bool> mShuttingDown;
+  MainThreadOnly<bool> mWaitingForPluginsSyncShutdown;
+
+  nsTArray<nsString> mPluginsWaitingForDeletion;
+
+  nsCOMPtr<nsIFile> mStorageBaseDir;
+
+  // Hashes of (origin,topLevelOrigin) to the node id for
+  // non-persistent sessions.
+  nsClassHashtable<nsUint32HashKey, nsCString> mTempNodeIds;
+
+  // Hashes node id to whether that node id is allowed to store data
+  // persistently on disk.
+  nsTHashMap<nsCStringHashKey, bool> mPersistentStorageAllowed;
+
+  // Synchronization for barrier that ensures we've loaded GMPs from
+  // MOZ_GMP_PATH before allowing GetContentParentFrom() to proceed.
+  Monitor mInitPromiseMonitor MOZ_UNANNOTATED;
+  MozMonitoredPromiseHolder<GenericPromise> mInitPromise;
+  bool mLoadPluginsFromDiskComplete;
+
+  // Hashes nodeId to the hashtable of storage for that nodeId.
+  nsRefPtrHashtable<nsCStringHashKey, GMPStorage> mTempGMPStorage;
+
+  // Tracks how many IPC connections to GMPServices running in content
+  // processes we have. When this is empty we can safely shut down.
+  // Synchronized across thread via mMutex in base class.
+  nsTArray<GMPServiceParent*> mServiceParents;
+
+  uint32_t mDirectoriesAdded = 0;
+  uint32_t mDirectoriesInProgress = 0;
+};
+
+nsresult WriteToFile(nsIFile* aPath, const nsACString& aFileName,
+                     const nsACString& aData);
+nsresult ReadSalt(nsIFile* aPath, nsACString& aOutData);
+bool MatchOrigin(nsIFile* aPath, const nsACString& aSite,
+                 const mozilla::OriginAttributesPattern& aPattern);
+bool MatchBaseDomain(nsIFile* aPath, const nsACString& aBaseDomain);
+
+class GMPServiceParent final : public PGMPServiceParent {
+ public:
+  explicit GMPServiceParent(GeckoMediaPluginServiceParent* aService);
+
+  // Our refcounting is thread safe, and when our refcount drops to zero
+  // we dispatch an event to the main thread to delete the GMPServiceParent.
+  // Note that this means it's safe for references to this object to be
+  // released on a non main thread, but the destructor will always run on
+  // the main thread.
+
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PGMPServiceParent.
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_DELETE_ON_MAIN_THREAD(
+      GMPServiceParent, final);
+
+  ipc::IPCResult RecvGetGMPNodeId(const nsAString& aOrigin,
+                                  const nsAString& aTopLevelOrigin,
+                                  const nsAString& aGMPName,
+                                  nsCString* aID) override;
+
+  static bool Create(Endpoint<PGMPServiceParent>&& aGMPService);
+
+  ipc::IPCResult RecvLaunchGMP(
+      const NodeIdVariant& aNodeIdVariant, const nsACString& aAPI,
+      nsTArray<nsCString>&& aTags, nsTArray<ProcessId>&& aAlreadyBridgedTo,
+      uint32_t* aOutPluginId, ProcessId* aOutProcessId,
+      nsCString* aOutDisplayName, Endpoint<PGMPContentParent>* aOutEndpoint,
+      nsresult* aOutRv, nsCString* aOutErrorDescription) override;
+
+ private:
+  ~GMPServiceParent();
+
+  RefPtr<GeckoMediaPluginServiceParent> mService;
+};
+
+}  // namespace gmp
+}  // namespace mozilla
+
+#endif  // GMPServiceParent_h_
diff --git a/dom/media/gmp/GMPSharedMemManager.cpp b/dom/media/gmp/GMPSharedMemManager.cpp
new file mode 100644
index 0000000000..5da04247cb
--- /dev/null
+++ b/dom/media/gmp/GMPSharedMemManager.cpp
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPSharedMemManager.h"
+#include "GMPMessageUtils.h"
+#include "mozilla/ipc/SharedMemory.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/ClearOnShutdown.h"
+
+namespace mozilla::gmp {
+
+// Really one set of pools on each side of the plugin API.
+
+// YUV buffers go from Encoder parent to child; pool there, and then return
+// with Decoded() frames to the Decoder parent and goes into the parent pool.
+// Compressed (encoded) data goes from the Decoder parent to the child;
+// pool there, and then return with Encoded() frames and goes into the parent
+// pool.
+bool GMPSharedMemManager::MgrAllocShmem(GMPSharedMem::GMPMemoryClasses aClass,
+                                        size_t aSize, ipc::Shmem* aMem) {
+  mData->CheckThread();
+
+  // first look to see if we have a free buffer large enough
+  for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
+    MOZ_ASSERT(GetGmpFreelist(aClass)[i].IsWritable());
+    if (aSize <= GetGmpFreelist(aClass)[i].Size<uint8_t>()) {
+      *aMem = GetGmpFreelist(aClass)[i];
+      GetGmpFreelist(aClass).RemoveElementAt(i);
+      return true;
+    }
+  }
+
+  // Didn't find a buffer free with enough space; allocate one
+  size_t pagesize = ipc::SharedMemory::SystemPageSize();
+  aSize = (aSize + (pagesize - 1)) & ~(pagesize - 1);  // round up to page size
+  bool retval = Alloc(aSize, aMem);
+  if (retval) {
+    // The allocator (or NeedsShmem call) should never return less than we ask
+    // for...
+    MOZ_ASSERT(aMem->Size<uint8_t>() >= aSize);
+    mData->mGmpAllocated[aClass]++;
+  }
+  return retval;
+}
+
+bool GMPSharedMemManager::MgrDeallocShmem(GMPSharedMem::GMPMemoryClasses aClass,
+                                          ipc::Shmem& aMem) {
+  mData->CheckThread();
+
+  size_t size = aMem.Size<uint8_t>();
+
+  // XXX Bug NNNNNNN Until we put better guards on ipc::shmem, verify we
+  // weren't fed an shmem we already had.
+  for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
+    if (NS_WARN_IF(aMem == GetGmpFreelist(aClass)[i])) {
+      // Safest to crash in this case; should never happen in normal
+      // operation.
+      MOZ_CRASH("Deallocating Shmem we already have in our cache!");
+      // return true;
+    }
+  }
+
+  // XXX This works; there are better pool algorithms.  We need to avoid
+  // "falling off a cliff" with too low a number
+  if (GetGmpFreelist(aClass).Length() > 10) {
+    Dealloc(std::move(GetGmpFreelist(aClass)[0]));
+    GetGmpFreelist(aClass).RemoveElementAt(0);
+    // The allocation numbers will be fubar on the Child!
+    mData->mGmpAllocated[aClass]--;
+  }
+  for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
+    MOZ_ASSERT(GetGmpFreelist(aClass)[i].IsWritable());
+    if (size < GetGmpFreelist(aClass)[i].Size<uint8_t>()) {
+      GetGmpFreelist(aClass).InsertElementAt(i, aMem);
+      return true;
+    }
+  }
+  GetGmpFreelist(aClass).AppendElement(aMem);
+
+  return true;
+}
+
+uint32_t GMPSharedMemManager::NumInUse(GMPSharedMem::GMPMemoryClasses aClass) {
+  return mData->mGmpAllocated[aClass] - GetGmpFreelist(aClass).Length();
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPSharedMemManager.h b/dom/media/gmp/GMPSharedMemManager.h
new file mode 100644
index 0000000000..ad4c3d39c2
--- /dev/null
+++ b/dom/media/gmp/GMPSharedMemManager.h
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPSharedMemManager_h_
+#define GMPSharedMemManager_h_
+
+#include "mozilla/ipc/Shmem.h"
+#include "nsTArray.h"
+
+namespace mozilla::gmp {
+
+class GMPSharedMemManager;
+
+class GMPSharedMem {
+ public:
+  typedef enum {
+    kGMPFrameData = 0,
+    kGMPEncodedData,
+    kGMPNumTypes
+  } GMPMemoryClasses;
+
+  // This is a heuristic - max of 10 free in the Child pool, plus those
+  // in-use for the encoder and decoder at the given moment and not yet
+  // returned to the parent pool (which is not included).  If more than
+  // this are needed, we presume the client has either crashed or hung
+  // (perhaps temporarily).
+  static const uint32_t kGMPBufLimit = 20;
+
+  GMPSharedMem() {
+    for (size_t i = 0; i < sizeof(mGmpAllocated) / sizeof(mGmpAllocated[0]);
+         i++) {
+      mGmpAllocated[i] = 0;
+    }
+  }
+  virtual ~GMPSharedMem() = default;
+
+  // Parent and child impls will differ here
+  virtual void CheckThread() = 0;
+
+ protected:
+  friend class GMPSharedMemManager;
+
+  nsTArray<ipc::Shmem> mGmpFreelist[GMPSharedMem::kGMPNumTypes];
+  uint32_t mGmpAllocated[GMPSharedMem::kGMPNumTypes];
+};
+
+class GMPSharedMemManager {
+ public:
+  explicit GMPSharedMemManager(GMPSharedMem* aData) : mData(aData) {}
+  virtual ~GMPSharedMemManager() = default;
+
+  virtual bool MgrAllocShmem(GMPSharedMem::GMPMemoryClasses aClass,
+                             size_t aSize, ipc::Shmem* aMem);
+  virtual bool MgrDeallocShmem(GMPSharedMem::GMPMemoryClasses aClass,
+                               ipc::Shmem& aMem);
+
+  // So we can know if data is "piling up" for the plugin - I.e. it's hung or
+  // crashed
+  virtual uint32_t NumInUse(GMPSharedMem::GMPMemoryClasses aClass);
+
+  // These have to be implemented using the AllocShmem/etc provided by the
+  // IPDL-generated interfaces, so have the Parent/Child implement them.
+  virtual bool Alloc(size_t aSize, ipc::Shmem* aMem) = 0;
+  virtual void Dealloc(ipc::Shmem&& aMem) = 0;
+
+ private:
+  nsTArray<ipc::Shmem>& GetGmpFreelist(GMPSharedMem::GMPMemoryClasses aTypes) {
+    return mData->mGmpFreelist[aTypes];
+  }
+
+  GMPSharedMem* mData;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPSharedMemManager_h_
diff --git a/dom/media/gmp/GMPStorage.h b/dom/media/gmp/GMPStorage.h
new file mode 100644
index 0000000000..aca8ca3f26
--- /dev/null
+++ b/dom/media/gmp/GMPStorage.h
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPStorage_h_
+#define GMPStorage_h_
+
+#include "gmp-storage.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "nsISupportsImpl.h"
+#include "nsString.h"
+#include "nsTArray.h"
+
+namespace mozilla::gmp {
+
+class GMPStorage {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPStorage)
+
+  virtual GMPErr Open(const nsACString& aRecordName) = 0;
+  virtual bool IsOpen(const nsACString& aRecordName) const = 0;
+  virtual GMPErr Read(const nsACString& aRecordName,
+                      nsTArray<uint8_t>& aOutBytes) = 0;
+  virtual GMPErr Write(const nsACString& aRecordName,
+                       const nsTArray<uint8_t>& aBytes) = 0;
+  virtual void Close(const nsACString& aRecordName) = 0;
+
+ protected:
+  virtual ~GMPStorage() = default;
+};
+
+already_AddRefed<GMPStorage> CreateGMPMemoryStorage();
+already_AddRefed<GMPStorage> CreateGMPDiskStorage(const nsACString& aNodeId,
+                                                  const nsAString& aGMPName);
+
+}  // namespace mozilla::gmp
+
+#endif
diff --git a/dom/media/gmp/GMPStorageChild.cpp b/dom/media/gmp/GMPStorageChild.cpp
new file mode 100644
index 0000000000..b08356e0d6
--- /dev/null
+++ b/dom/media/gmp/GMPStorageChild.cpp
@@ -0,0 +1,244 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPStorageChild.h"
+#include "GMPChild.h"
+#include "gmp-storage.h"
+#include "base/task.h"
+
+#define ON_GMP_THREAD() (mPlugin->GMPMessageLoop() == MessageLoop::current())
+
+#define CALL_ON_GMP_THREAD(_func, ...)                        \
+  do {                                                        \
+    if (ON_GMP_THREAD()) {                                    \
+      _func(__VA_ARGS__);                                     \
+    } else {                                                  \
+      mPlugin->GMPMessageLoop()->PostTask(                    \
+          dont_add_new_uses_of_this::NewRunnableMethod(       \
+              this, &GMPStorageChild::_func, ##__VA_ARGS__)); \
+    }                                                         \
+  } while (false)
+
+namespace mozilla::gmp {
+
+static nsTArray<uint8_t> ToArray(const uint8_t* aData, uint32_t aDataSize) {
+  nsTArray<uint8_t> data;
+  data.AppendElements(aData, aDataSize);
+  return data;
+}
+
+GMPRecordImpl::GMPRecordImpl(GMPStorageChild* aOwner, const nsCString& aName,
+                             GMPRecordClient* aClient)
+    : mName(aName), mClient(aClient), mOwner(aOwner) {}
+
+GMPErr GMPRecordImpl::Open() { return mOwner->Open(this); }
+
+void GMPRecordImpl::OpenComplete(GMPErr aStatus) {
+  mClient->OpenComplete(aStatus);
+}
+
+GMPErr GMPRecordImpl::Read() { return mOwner->Read(this); }
+
+void GMPRecordImpl::ReadComplete(GMPErr aStatus, const uint8_t* aBytes,
+                                 uint32_t aLength) {
+  mClient->ReadComplete(aStatus, aBytes, aLength);
+}
+
+GMPErr GMPRecordImpl::Write(const uint8_t* aData, uint32_t aDataSize) {
+  return mOwner->Write(this, aData, aDataSize);
+}
+
+void GMPRecordImpl::WriteComplete(GMPErr aStatus) {
+  mClient->WriteComplete(aStatus);
+}
+
+GMPErr GMPRecordImpl::Close() {
+  RefPtr<GMPRecordImpl> kungfuDeathGrip(this);
+  // Delete our self reference.
+  Release();
+  mOwner->Close(this->Name());
+  return GMPNoErr;
+}
+
+GMPStorageChild::GMPStorageChild(GMPChild* aPlugin)
+    : mMonitor("GMPStorageChild"), mPlugin(aPlugin), mShutdown(false) {
+  MOZ_ASSERT(ON_GMP_THREAD());
+}
+
+GMPErr GMPStorageChild::CreateRecord(const nsCString& aRecordName,
+                                     GMPRecord** aOutRecord,
+                                     GMPRecordClient* aClient) {
+  MonitorAutoLock lock(mMonitor);
+
+  if (mShutdown) {
+    NS_WARNING("GMPStorage used after it's been shutdown!");
+    return GMPClosedErr;
+  }
+
+  MOZ_ASSERT(aRecordName.Length() && aOutRecord);
+
+  if (HasRecord(aRecordName)) {
+    return GMPRecordInUse;
+  }
+
+  RefPtr<GMPRecordImpl> record(new GMPRecordImpl(this, aRecordName, aClient));
+  mRecords.InsertOrUpdate(aRecordName, RefPtr{record});  // Addrefs
+
+  // The GMPRecord holds a self reference until the GMP calls Close() on
+  // it. This means the object is always valid (even if neutered) while
+  // the GMP expects it to be.
+  record.forget(aOutRecord);
+
+  return GMPNoErr;
+}
+
+bool GMPStorageChild::HasRecord(const nsCString& aRecordName) {
+  mMonitor.AssertCurrentThreadOwns();
+  return mRecords.Contains(aRecordName);
+}
+
+already_AddRefed<GMPRecordImpl> GMPStorageChild::GetRecord(
+    const nsCString& aRecordName) {
+  MonitorAutoLock lock(mMonitor);
+  RefPtr<GMPRecordImpl> record;
+  mRecords.Get(aRecordName, getter_AddRefs(record));
+  return record.forget();
+}
+
+GMPErr GMPStorageChild::Open(GMPRecordImpl* aRecord) {
+  MonitorAutoLock lock(mMonitor);
+
+  if (mShutdown) {
+    NS_WARNING("GMPStorage used after it's been shutdown!");
+    return GMPClosedErr;
+  }
+
+  if (!HasRecord(aRecord->Name())) {
+    // Trying to re-open a record that has already been closed.
+    return GMPClosedErr;
+  }
+
+  CALL_ON_GMP_THREAD(SendOpen, aRecord->Name());
+
+  return GMPNoErr;
+}
+
+GMPErr GMPStorageChild::Read(GMPRecordImpl* aRecord) {
+  MonitorAutoLock lock(mMonitor);
+
+  if (mShutdown) {
+    NS_WARNING("GMPStorage used after it's been shutdown!");
+    return GMPClosedErr;
+  }
+
+  if (!HasRecord(aRecord->Name())) {
+    // Record not opened.
+    return GMPClosedErr;
+  }
+
+  CALL_ON_GMP_THREAD(SendRead, aRecord->Name());
+
+  return GMPNoErr;
+}
+
+GMPErr GMPStorageChild::Write(GMPRecordImpl* aRecord, const uint8_t* aData,
+                              uint32_t aDataSize) {
+  if (aDataSize > GMP_MAX_RECORD_SIZE) {
+    return GMPQuotaExceededErr;
+  }
+
+  MonitorAutoLock lock(mMonitor);
+
+  if (mShutdown) {
+    NS_WARNING("GMPStorage used after it's been shutdown!");
+    return GMPClosedErr;
+  }
+
+  if (!HasRecord(aRecord->Name())) {
+    // Record not opened.
+    return GMPClosedErr;
+  }
+
+  CALL_ON_GMP_THREAD(SendWrite, aRecord->Name(), ToArray(aData, aDataSize));
+
+  return GMPNoErr;
+}
+
+GMPErr GMPStorageChild::Close(const nsCString& aRecordName) {
+  MonitorAutoLock lock(mMonitor);
+
+  if (!HasRecord(aRecordName)) {
+    // Already closed.
+    return GMPClosedErr;
+  }
+
+  mRecords.Remove(aRecordName);
+
+  if (!mShutdown) {
+    CALL_ON_GMP_THREAD(SendClose, aRecordName);
+  }
+
+  return GMPNoErr;
+}
+
+mozilla::ipc::IPCResult GMPStorageChild::RecvOpenComplete(
+    const nsCString& aRecordName, const GMPErr& aStatus) {
+  // We don't need a lock to read |mShutdown| since it is only changed in
+  // the GMP thread.
+  if (mShutdown) {
+    return IPC_OK();
+  }
+  RefPtr<GMPRecordImpl> record = GetRecord(aRecordName);
+  if (!record) {
+    // Not fatal.
+    return IPC_OK();
+  }
+  record->OpenComplete(aStatus);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPStorageChild::RecvReadComplete(
+    const nsCString& aRecordName, const GMPErr& aStatus,
+    nsTArray<uint8_t>&& aBytes) {
+  if (mShutdown) {
+    return IPC_OK();
+  }
+  RefPtr<GMPRecordImpl> record = GetRecord(aRecordName);
+  if (!record) {
+    // Not fatal.
+    return IPC_OK();
+  }
+  record->ReadComplete(aStatus, aBytes.Elements(), aBytes.Length());
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPStorageChild::RecvWriteComplete(
+    const nsCString& aRecordName, const GMPErr& aStatus) {
+  if (mShutdown) {
+    return IPC_OK();
+  }
+  RefPtr<GMPRecordImpl> record = GetRecord(aRecordName);
+  if (!record) {
+    // Not fatal.
+    return IPC_OK();
+  }
+  record->WriteComplete(aStatus);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPStorageChild::RecvShutdown() {
+  // Block any new storage requests, and thus any messages back to the
+  // parent. We don't delete any objects here, as that may invalidate
+  // GMPRecord pointers held by the GMP.
+  MonitorAutoLock lock(mMonitor);
+  mShutdown = true;
+  return IPC_OK();
+}
+
+}  // namespace mozilla::gmp
+
+// avoid redefined macro in unified build
+#undef ON_GMP_THREAD
+#undef CALL_ON_GMP_THREAD
diff --git a/dom/media/gmp/GMPStorageChild.h b/dom/media/gmp/GMPStorageChild.h
new file mode 100644
index 0000000000..97c61a5007
--- /dev/null
+++ b/dom/media/gmp/GMPStorageChild.h
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPStorageChild_h_
+#define GMPStorageChild_h_
+
+#include "mozilla/gmp/PGMPStorageChild.h"
+#include "gmp-storage.h"
+#include "nsTHashtable.h"
+#include "nsRefPtrHashtable.h"
+#include "gmp-platform.h"
+
+#include <queue>
+
+namespace mozilla::gmp {
+
+class GMPChild;
+class GMPStorageChild;
+
+class GMPRecordImpl : public GMPRecord {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPRecordImpl)
+
+  GMPRecordImpl(GMPStorageChild* aOwner, const nsCString& aName,
+                GMPRecordClient* aClient);
+
+  // GMPRecord.
+  GMPErr Open() override;
+  GMPErr Read() override;
+  GMPErr Write(const uint8_t* aData, uint32_t aDataSize) override;
+  GMPErr Close() override;
+
+  const nsCString& Name() const { return mName; }
+
+  void OpenComplete(GMPErr aStatus);
+  void ReadComplete(GMPErr aStatus, const uint8_t* aBytes, uint32_t aLength);
+  void WriteComplete(GMPErr aStatus);
+
+ private:
+  ~GMPRecordImpl() = default;
+  const nsCString mName;
+  GMPRecordClient* const mClient;
+  GMPStorageChild* const mOwner;
+};
+
+class GMPStorageChild : public PGMPStorageChild {
+  friend class PGMPStorageChild;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPStorageChild)
+
+  explicit GMPStorageChild(GMPChild* aPlugin);
+
+  GMPErr CreateRecord(const nsCString& aRecordName, GMPRecord** aOutRecord,
+                      GMPRecordClient* aClient);
+
+  GMPErr Open(GMPRecordImpl* aRecord);
+
+  GMPErr Read(GMPRecordImpl* aRecord);
+
+  GMPErr Write(GMPRecordImpl* aRecord, const uint8_t* aData,
+               uint32_t aDataSize);
+
+  GMPErr Close(const nsCString& aRecordName);
+
+ private:
+  bool HasRecord(const nsCString& aRecordName);
+  already_AddRefed<GMPRecordImpl> GetRecord(const nsCString& aRecordName);
+
+ protected:
+  ~GMPStorageChild() = default;
+
+  // PGMPStorageChild
+  mozilla::ipc::IPCResult RecvOpenComplete(const nsCString& aRecordName,
+                                           const GMPErr& aStatus);
+  mozilla::ipc::IPCResult RecvReadComplete(const nsCString& aRecordName,
+                                           const GMPErr& aStatus,
+                                           nsTArray<uint8_t>&& aBytes);
+  mozilla::ipc::IPCResult RecvWriteComplete(const nsCString& aRecordName,
+                                            const GMPErr& aStatus);
+  mozilla::ipc::IPCResult RecvShutdown();
+
+ private:
+  Monitor mMonitor MOZ_UNANNOTATED;
+  nsRefPtrHashtable<nsCStringHashKey, GMPRecordImpl> mRecords;
+  GMPChild* mPlugin;
+  bool mShutdown;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPStorageChild_h_
diff --git a/dom/media/gmp/GMPStorageParent.cpp b/dom/media/gmp/GMPStorageParent.cpp
new file mode 100644
index 0000000000..d153f5cace
--- /dev/null
+++ b/dom/media/gmp/GMPStorageParent.cpp
@@ -0,0 +1,194 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPStorageParent.h"
+#include "GMPParent.h"
+#include "gmp-storage.h"
+#include "mozilla/Unused.h"
+
+namespace mozilla {
+
+#ifdef LOG
+#  undef LOG
+#endif
+
+extern LogModule* GetGMPLog();
+
+#define LOGD(msg) MOZ_LOG(GetGMPLog(), mozilla::LogLevel::Debug, msg)
+#define LOG(level, msg) MOZ_LOG(GetGMPLog(), (level), msg)
+
+namespace gmp {
+
+GMPStorageParent::GMPStorageParent(const nsACString& aNodeId,
+                                   GMPParent* aPlugin)
+    : mNodeId(aNodeId), mPlugin(aPlugin), mShutdown(true) {}
+
+nsresult GMPStorageParent::Init() {
+  LOGD(("GMPStorageParent[%p]::Init()", this));
+
+  if (NS_WARN_IF(mNodeId.IsEmpty())) {
+    return NS_ERROR_FAILURE;
+  }
+  RefPtr<GeckoMediaPluginServiceParent> mps(
+      GeckoMediaPluginServiceParent::GetSingleton());
+  if (NS_WARN_IF(!mps)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  bool persistent = false;
+  if (NS_WARN_IF(
+          NS_FAILED(mps->IsPersistentStorageAllowed(mNodeId, &persistent)))) {
+    return NS_ERROR_FAILURE;
+  }
+  if (persistent) {
+    mStorage = CreateGMPDiskStorage(mNodeId, mPlugin->GetPluginBaseName());
+  } else {
+    mStorage = mps->GetMemoryStorageFor(mNodeId);
+  }
+  if (!mStorage) {
+    return NS_ERROR_FAILURE;
+  }
+
+  mShutdown = false;
+  return NS_OK;
+}
+
+mozilla::ipc::IPCResult GMPStorageParent::RecvOpen(
+    const nsACString& aRecordName) {
+  LOGD(("GMPStorageParent[%p]::RecvOpen(record='%s')", this,
+        PromiseFlatCString(aRecordName).get()));
+
+  if (mShutdown) {
+    // Shutdown is an expected state, so we do not IPC_FAIL.
+    return IPC_OK();
+  }
+
+  if (mNodeId.EqualsLiteral("null")) {
+    // Refuse to open storage if the page is opened from local disk,
+    // or shared across origin.
+    LOGD(("GMPStorageParent[%p]::RecvOpen(record='%s') failed; null nodeId",
+          this, PromiseFlatCString(aRecordName).get()));
+    Unused << SendOpenComplete(aRecordName, GMPGenericErr);
+    return IPC_OK();
+  }
+
+  if (aRecordName.IsEmpty()) {
+    LOGD((
+        "GMPStorageParent[%p]::RecvOpen(record='%s') failed; record name empty",
+        this, PromiseFlatCString(aRecordName).get()));
+    Unused << SendOpenComplete(aRecordName, GMPGenericErr);
+    return IPC_OK();
+  }
+
+  if (mStorage->IsOpen(aRecordName)) {
+    LOGD(("GMPStorageParent[%p]::RecvOpen(record='%s') failed; record in use",
+          this, PromiseFlatCString(aRecordName).get()));
+    Unused << SendOpenComplete(aRecordName, GMPRecordInUse);
+    return IPC_OK();
+  }
+
+  auto err = mStorage->Open(aRecordName);
+  MOZ_ASSERT(GMP_FAILED(err) || mStorage->IsOpen(aRecordName));
+  LOGD(("GMPStorageParent[%p]::RecvOpen(record='%s') complete; rv=%d", this,
+        PromiseFlatCString(aRecordName).get(), err));
+  Unused << SendOpenComplete(aRecordName, err);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPStorageParent::RecvRead(
+    const nsACString& aRecordName) {
+  LOGD(("GMPStorageParent[%p]::RecvRead(record='%s')", this,
+        PromiseFlatCString(aRecordName).get()));
+
+  if (mShutdown) {
+    // Shutdown is an expected state, so we do not IPC_FAIL.
+    return IPC_OK();
+  }
+
+  nsTArray<uint8_t> data;
+  if (!mStorage->IsOpen(aRecordName)) {
+    LOGD(("GMPStorageParent[%p]::RecvRead(record='%s') failed; record not open",
+          this, PromiseFlatCString(aRecordName).get()));
+    Unused << SendReadComplete(aRecordName, GMPClosedErr, data);
+  } else {
+    GMPErr rv = mStorage->Read(aRecordName, data);
+    LOGD(
+        ("GMPStorageParent[%p]::RecvRead(record='%s') read %zu bytes "
+         "rv=%" PRIu32,
+         this, PromiseFlatCString(aRecordName).get(), data.Length(),
+         static_cast<uint32_t>(rv)));
+    Unused << SendReadComplete(aRecordName, rv, data);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPStorageParent::RecvWrite(
+    const nsACString& aRecordName, nsTArray<uint8_t>&& aBytes) {
+  LOGD(("GMPStorageParent[%p]::RecvWrite(record='%s') %zu bytes", this,
+        PromiseFlatCString(aRecordName).get(), aBytes.Length()));
+
+  if (mShutdown) {
+    // Shutdown is an expected state, so we do not IPC_FAIL.
+    return IPC_OK();
+  }
+
+  if (!mStorage->IsOpen(aRecordName)) {
+    LOGD(("GMPStorageParent[%p]::RecvWrite(record='%s') failed record not open",
+          this, PromiseFlatCString(aRecordName).get()));
+    Unused << SendWriteComplete(aRecordName, GMPClosedErr);
+    return IPC_OK();
+  }
+
+  if (aBytes.Length() > GMP_MAX_RECORD_SIZE) {
+    LOGD(("GMPStorageParent[%p]::RecvWrite(record='%s') failed record too big",
+          this, PromiseFlatCString(aRecordName).get()));
+    Unused << SendWriteComplete(aRecordName, GMPQuotaExceededErr);
+    return IPC_OK();
+  }
+
+  GMPErr rv = mStorage->Write(aRecordName, aBytes);
+  LOGD(("GMPStorageParent[%p]::RecvWrite(record='%s') write complete rv=%d",
+        this, PromiseFlatCString(aRecordName).get(), rv));
+
+  Unused << SendWriteComplete(aRecordName, rv);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPStorageParent::RecvClose(
+    const nsACString& aRecordName) {
+  LOGD(("GMPStorageParent[%p]::RecvClose(record='%s')", this,
+        PromiseFlatCString(aRecordName).get()));
+
+  if (mShutdown) {
+    return IPC_OK();
+  }
+
+  mStorage->Close(aRecordName);
+
+  return IPC_OK();
+}
+
+void GMPStorageParent::ActorDestroy(ActorDestroyReason aWhy) {
+  LOGD(("GMPStorageParent[%p]::ActorDestroy(reason=%d)", this, aWhy));
+  Shutdown();
+}
+
+void GMPStorageParent::Shutdown() {
+  LOGD(("GMPStorageParent[%p]::Shutdown()", this));
+
+  if (mShutdown) {
+    return;
+  }
+  mShutdown = true;
+  Unused << SendShutdown();
+
+  mStorage = nullptr;
+}
+
+}  // namespace gmp
+}  // namespace mozilla
diff --git a/dom/media/gmp/GMPStorageParent.h b/dom/media/gmp/GMPStorageParent.h
new file mode 100644
index 0000000000..b0cbba14c1
--- /dev/null
+++ b/dom/media/gmp/GMPStorageParent.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPStorageParent_h_
+#define GMPStorageParent_h_
+
+#include "mozilla/gmp/PGMPStorageParent.h"
+#include "GMPStorage.h"
+
+namespace mozilla::gmp {
+
+class GMPParent;
+
+class GMPStorageParent : public PGMPStorageParent {
+  friend class PGMPStorageParent;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(GMPStorageParent)
+  GMPStorageParent(const nsACString& aNodeId, GMPParent* aPlugin);
+
+  nsresult Init();
+  void Shutdown();
+
+ protected:
+  mozilla::ipc::IPCResult RecvOpen(const nsACString& aRecordName) override;
+  mozilla::ipc::IPCResult RecvRead(const nsACString& aRecordName) override;
+  mozilla::ipc::IPCResult RecvWrite(const nsACString& aRecordName,
+                                    nsTArray<uint8_t>&& aBytes) override;
+  mozilla::ipc::IPCResult RecvClose(const nsACString& aRecordName) override;
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+
+ private:
+  ~GMPStorageParent() = default;
+
+  RefPtr<GMPStorage> mStorage;
+
+  const nsCString mNodeId;
+  RefPtr<GMPParent> mPlugin;
+  // True after Shutdown(), or if Init() has not completed successfully.
+  bool mShutdown;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPStorageParent_h_
diff --git a/dom/media/gmp/GMPTimerChild.cpp b/dom/media/gmp/GMPTimerChild.cpp
new file mode 100644
index 0000000000..8858f5f87f
--- /dev/null
+++ b/dom/media/gmp/GMPTimerChild.cpp
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPTimerChild.h"
+#include "GMPPlatform.h"
+#include "GMPChild.h"
+
+#define MAX_NUM_TIMERS 1000
+
+namespace mozilla::gmp {
+
+GMPTimerChild::GMPTimerChild(GMPChild* aPlugin)
+    : mTimerCount(1), mPlugin(aPlugin) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+}
+
+GMPTimerChild::~GMPTimerChild() {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+}
+
+GMPErr GMPTimerChild::SetTimer(GMPTask* aTask, int64_t aTimeoutMS) {
+  if (!aTask) {
+    NS_WARNING("Tried to set timer with null task!");
+    return GMPGenericErr;
+  }
+
+  if (mPlugin->GMPMessageLoop() != MessageLoop::current()) {
+    NS_WARNING("Tried to set GMP timer on non-main thread.");
+    return GMPGenericErr;
+  }
+
+  if (mTimers.Count() > MAX_NUM_TIMERS) {
+    return GMPQuotaExceededErr;
+  }
+  uint32_t timerId = mTimerCount;
+  mTimers.InsertOrUpdate(timerId, aTask);
+  mTimerCount++;
+
+  if (!SendSetTimer(timerId, aTimeoutMS)) {
+    return GMPGenericErr;
+  }
+  return GMPNoErr;
+}
+
+mozilla::ipc::IPCResult GMPTimerChild::RecvTimerExpired(
+    const uint32_t& aTimerId) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  GMPTask* task = mTimers.Get(aTimerId);
+  mTimers.Remove(aTimerId);
+  if (task) {
+    RunOnMainThread(task);
+  }
+  return IPC_OK();
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPTimerChild.h b/dom/media/gmp/GMPTimerChild.h
new file mode 100644
index 0000000000..f81f796e12
--- /dev/null
+++ b/dom/media/gmp/GMPTimerChild.h
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPTimerChild_h_
+#define GMPTimerChild_h_
+
+#include "mozilla/gmp/PGMPTimerChild.h"
+#include "mozilla/Monitor.h"
+#include "nsTHashMap.h"
+#include "nsHashKeys.h"
+#include "gmp-errors.h"
+#include "gmp-platform.h"
+
+namespace mozilla::gmp {
+
+class GMPChild;
+
+class GMPTimerChild : public PGMPTimerChild {
+  friend class PGMPTimerChild;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(GMPTimerChild)
+
+  explicit GMPTimerChild(GMPChild* aPlugin);
+
+  GMPErr SetTimer(GMPTask* aTask, int64_t aTimeoutMS);
+
+ protected:
+  // GMPTimerChild
+  mozilla::ipc::IPCResult RecvTimerExpired(const uint32_t& aTimerId);
+
+ private:
+  ~GMPTimerChild();
+
+  nsTHashMap<nsUint32HashKey, GMPTask*> mTimers;
+  uint32_t mTimerCount;
+
+  GMPChild* mPlugin;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPTimerChild_h_
diff --git a/dom/media/gmp/GMPTimerParent.cpp b/dom/media/gmp/GMPTimerParent.cpp
new file mode 100644
index 0000000000..31b17ef214
--- /dev/null
+++ b/dom/media/gmp/GMPTimerParent.cpp
@@ -0,0 +1,105 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPTimerParent.h"
+
+#include "GMPLog.h"
+#include "mozilla/Unused.h"
+#include "nsComponentManagerUtils.h"
+
+namespace mozilla {
+
+extern LogModule* GetGMPLog();
+
+#ifdef __CLASS__
+#  undef __CLASS__
+#endif
+#define __CLASS__ "GMPTimerParent"
+
+namespace gmp {
+
+GMPTimerParent::GMPTimerParent(nsISerialEventTarget* aGMPEventTarget)
+    : mGMPEventTarget(aGMPEventTarget), mIsOpen(true) {}
+
+mozilla::ipc::IPCResult GMPTimerParent::RecvSetTimer(
+    const uint32_t& aTimerId, const uint32_t& aTimeoutMs) {
+  GMP_LOG_DEBUG("%s::%s: %p mIsOpen=%d", __CLASS__, __FUNCTION__, this,
+                mIsOpen);
+
+  MOZ_ASSERT(mGMPEventTarget->IsOnCurrentThread());
+
+  if (!mIsOpen) {
+    return IPC_OK();
+  }
+
+  nsresult rv;
+  UniquePtr<Context> ctx(new Context());
+
+  rv = NS_NewTimerWithFuncCallback(
+      getter_AddRefs(ctx->mTimer), &GMPTimerParent::GMPTimerExpired, ctx.get(),
+      aTimeoutMs, nsITimer::TYPE_ONE_SHOT, "gmp::GMPTimerParent::RecvSetTimer",
+      mGMPEventTarget);
+  NS_ENSURE_SUCCESS(rv, IPC_OK());
+
+  ctx->mId = aTimerId;
+  ctx->mParent = this;
+
+  mTimers.Insert(ctx.release());
+
+  return IPC_OK();
+}
+
+void GMPTimerParent::Shutdown() {
+  GMP_LOG_DEBUG("%s::%s: %p mIsOpen=%d", __CLASS__, __FUNCTION__, this,
+                mIsOpen);
+
+  MOZ_ASSERT(mGMPEventTarget->IsOnCurrentThread());
+
+  for (Context* context : mTimers) {
+    context->mTimer->Cancel();
+    delete context;
+  }
+
+  mTimers.Clear();
+  mIsOpen = false;
+}
+
+void GMPTimerParent::ActorDestroy(ActorDestroyReason aWhy) {
+  GMP_LOG_DEBUG("%s::%s: %p mIsOpen=%d", __CLASS__, __FUNCTION__, this,
+                mIsOpen);
+
+  Shutdown();
+}
+
+/* static */
+void GMPTimerParent::GMPTimerExpired(nsITimer* aTimer, void* aClosure) {
+  MOZ_ASSERT(aClosure);
+  UniquePtr<Context> ctx(static_cast<Context*>(aClosure));
+  MOZ_ASSERT(ctx->mParent);
+  if (ctx->mParent) {
+    ctx->mParent->TimerExpired(ctx.get());
+  }
+}
+
+void GMPTimerParent::TimerExpired(Context* aContext) {
+  GMP_LOG_DEBUG("%s::%s: %p mIsOpen=%d", __CLASS__, __FUNCTION__, this,
+                mIsOpen);
+  MOZ_ASSERT(mGMPEventTarget->IsOnCurrentThread());
+
+  if (!mIsOpen) {
+    return;
+  }
+
+  uint32_t id = aContext->mId;
+  mTimers.Remove(aContext);
+  if (id) {
+    Unused << SendTimerExpired(id);
+  }
+}
+
+}  // namespace gmp
+}  // namespace mozilla
+
+#undef __CLASS__
diff --git a/dom/media/gmp/GMPTimerParent.h b/dom/media/gmp/GMPTimerParent.h
new file mode 100644
index 0000000000..dae1d9a1fb
--- /dev/null
+++ b/dom/media/gmp/GMPTimerParent.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPTimerParent_h_
+#define GMPTimerParent_h_
+
+#include "mozilla/gmp/PGMPTimerParent.h"
+#include "nsITimer.h"
+#include "nsCOMPtr.h"
+#include "nsTHashSet.h"
+#include "mozilla/Monitor.h"
+
+namespace mozilla::gmp {
+
+class GMPTimerParent : public PGMPTimerParent {
+  friend class PGMPTimerParent;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(GMPTimerParent)
+  explicit GMPTimerParent(nsISerialEventTarget* aGMPEventTarget);
+
+  void Shutdown();
+
+ protected:
+  mozilla::ipc::IPCResult RecvSetTimer(const uint32_t& aTimerId,
+                                       const uint32_t& aTimeoutMs);
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+
+ private:
+  ~GMPTimerParent() = default;
+
+  static void GMPTimerExpired(nsITimer* aTimer, void* aClosure);
+
+  struct Context {
+    Context() : mId(0) { MOZ_COUNT_CTOR(Context); }
+    MOZ_COUNTED_DTOR(Context)
+    nsCOMPtr<nsITimer> mTimer;
+    RefPtr<GMPTimerParent>
+        mParent;  // Note: live timers keep the GMPTimerParent alive.
+    uint32_t mId;
+  };
+
+  void TimerExpired(Context* aContext);
+
+  nsTHashSet<Context*> mTimers;
+
+  nsCOMPtr<nsISerialEventTarget> mGMPEventTarget;
+
+  bool mIsOpen;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPTimerParent_h_
diff --git a/dom/media/gmp/GMPTypes.ipdlh b/dom/media/gmp/GMPTypes.ipdlh
new file mode 100644
index 0000000000..d0449a80d9
--- /dev/null
+++ b/dom/media/gmp/GMPTypes.ipdlh
@@ -0,0 +1,115 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include "GMPMessageUtils.h";
+
+using cdm::EncryptionScheme from "GMPSanitizedExports.h";
+using GMPBufferType from "gmp-video-codec.h";
+
+namespace mozilla {
+namespace gmp {
+
+// GMP processes are associated with a specific node ID, so all GMP requests
+// which have the same node ID will use the same GMP process. Depending on the
+// use case, the node ID may be represented by a string (such as when used for
+// WebRTC) or by this structure, which is populated according to the origin
+// initiating the request. This structure will eventually be converted to a
+// string representing a node ID.  For this structure, the process ensures the
+// strings are unique for the combination of origin, top level origin and GMP
+// name.
+struct NodeIdParts {
+  nsString mOrigin;
+  nsString mTopLevelOrigin;
+  nsString mGMPName;
+};
+
+// A NodeIdVariant should contain either
+// - A string representing an already computed node ID.
+// - A NodeIdParts representing a node ID that still needs to be computed by
+//   processing those parts.
+// This union is used to simplify passing of node ID information. Some
+// GMP use cases can hard code their node ID, while others need to compute
+// the node ID later. This lets us avoid having overloads to handle
+// the two different paths.
+union NodeIdVariant {
+  nsCString;
+  NodeIdParts;
+};
+
+struct GMPVideoEncodedFrameData {
+  uint32_t mEncodedWidth;
+  uint32_t mEncodedHeight;
+  uint64_t mTimestamp;  // microseconds
+  uint64_t mDuration;   // microseconds
+  uint32_t mFrameType;
+  uint32_t mSize;
+  GMPBufferType mBufferType;
+  Shmem mBuffer;
+  bool mCompleteFrame;
+};
+
+struct GMPPlaneData {
+  int32_t mSize;
+  int32_t mStride;
+  Shmem mBuffer;
+};
+
+struct GMPVideoi420FrameData {
+  GMPPlaneData mYPlane;
+  GMPPlaneData mUPlane;
+  GMPPlaneData mVPlane;
+  int32_t mWidth;
+  int32_t mHeight;
+  uint64_t mTimestamp;  // microseconds
+  uint64_t mDuration;   // microseconds
+};
+
+struct CDMInputBuffer {
+  Shmem mData;
+  uint8_t[] mKeyId;
+  uint8_t[] mIV;
+  int64_t mTimestamp;
+  int64_t mDuration;
+  uint32_t[] mClearBytes;
+  uint32_t[] mCipherBytes;
+  uint8_t mCryptByteBlock;
+  uint8_t mSkipByteBlock;
+  EncryptionScheme mEncryptionScheme;
+};
+
+struct CDMVideoDecoderConfig {
+  uint32_t mCodec;
+  uint32_t mProfile;
+  uint32_t mFormat;
+  int32_t mImageWidth;
+  int32_t mImageHeight;
+  uint8_t[] mExtraData;
+  EncryptionScheme mEncryptionScheme;
+};
+
+struct CDMKeyInformation {
+  uint8_t[] mKeyId;
+  uint32_t mStatus;
+  uint32_t mSystemCode;
+};
+
+struct CDMVideoPlane {
+  uint32_t mPlaneOffset;
+  uint32_t mStride;
+};
+
+struct CDMVideoFrame {
+  uint32_t mFormat;
+  int32_t mImageWidth;
+  int32_t mImageHeight;
+  CDMVideoPlane mYPlane;
+  CDMVideoPlane mUPlane;
+  CDMVideoPlane mVPlane;
+  int64_t mTimestamp;
+  int64_t mDuration;
+};
+
+}  // namespace gmp
+}  // namespace mozilla
diff --git a/dom/media/gmp/GMPUtils.cpp b/dom/media/gmp/GMPUtils.cpp
new file mode 100644
index 0000000000..e44ee19e08
--- /dev/null
+++ b/dom/media/gmp/GMPUtils.cpp
@@ -0,0 +1,228 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPUtils.h"
+
+#include "GMPService.h"
+#include "VideoLimits.h"
+#include "mozIGeckoMediaPluginService.h"
+#include "mozilla/Base64.h"
+#include "nsCOMPtr.h"
+#include "nsCRTGlue.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsIConsoleService.h"
+#include "nsIFile.h"
+#include "nsLiteralString.h"
+#include "prio.h"
+
+namespace mozilla {
+
+void SplitAt(const char* aDelims, const nsACString& aInput,
+             nsTArray<nsCString>& aOutTokens) {
+  nsAutoCString str(aInput);
+  char* end = str.BeginWriting();
+  const char* start = nullptr;
+  while (!!(start = NS_strtok(aDelims, &end))) {
+    aOutTokens.AppendElement(nsCString(start));
+  }
+}
+
+nsCString ToHexString(const uint8_t* aBytes, uint32_t aLength) {
+  static const char hex[] = {'0', '1', '2', '3', '4', '5', '6', '7',
+                             '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+  nsCString str;
+  for (uint32_t i = 0; i < aLength; i++) {
+    char buf[3];
+    buf[0] = hex[(aBytes[i] & 0xf0) >> 4];
+    buf[1] = hex[aBytes[i] & 0x0f];
+    buf[2] = 0;
+    str.AppendASCII(buf);
+  }
+  return str;
+}
+
+nsCString ToHexString(const nsTArray<uint8_t>& aBytes) {
+  return ToHexString(aBytes.Elements(), aBytes.Length());
+}
+
+bool FileExists(nsIFile* aFile) {
+  bool exists = false;
+  return aFile && NS_SUCCEEDED(aFile->Exists(&exists)) && exists;
+}
+
+DirectoryEnumerator::DirectoryEnumerator(nsIFile* aPath, Mode aMode)
+    : mMode(aMode) {
+  aPath->GetDirectoryEntries(getter_AddRefs(mIter));
+}
+
+already_AddRefed<nsIFile> DirectoryEnumerator::Next() {
+  if (!mIter) {
+    return nullptr;
+  }
+  bool hasMore = false;
+  while (NS_SUCCEEDED(mIter->HasMoreElements(&hasMore)) && hasMore) {
+    nsCOMPtr<nsISupports> supports;
+    nsresult rv = mIter->GetNext(getter_AddRefs(supports));
+    if (NS_FAILED(rv)) {
+      continue;
+    }
+
+    nsCOMPtr<nsIFile> path(do_QueryInterface(supports, &rv));
+    if (NS_FAILED(rv)) {
+      continue;
+    }
+
+    if (mMode == DirsOnly) {
+      bool isDirectory = false;
+      rv = path->IsDirectory(&isDirectory);
+      if (NS_FAILED(rv) || !isDirectory) {
+        continue;
+      }
+    }
+    return path.forget();
+  }
+  return nullptr;
+}
+
+bool ReadIntoArray(nsIFile* aFile, nsTArray<uint8_t>& aOutDst,
+                   size_t aMaxLength) {
+  if (!FileExists(aFile)) {
+    return false;
+  }
+
+  PRFileDesc* fd = nullptr;
+  nsresult rv = aFile->OpenNSPRFileDesc(PR_RDONLY, 0, &fd);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  int32_t length = PR_Seek(fd, 0, PR_SEEK_END);
+  PR_Seek(fd, 0, PR_SEEK_SET);
+
+  if (length < 0 || (size_t)length > aMaxLength) {
+    NS_WARNING("EME file is longer than maximum allowed length");
+    PR_Close(fd);
+    return false;
+  }
+  aOutDst.SetLength(length);
+  int32_t bytesRead = PR_Read(fd, aOutDst.Elements(), length);
+  PR_Close(fd);
+  return (bytesRead == length);
+}
+
+bool ReadIntoString(nsIFile* aFile, nsCString& aOutDst, size_t aMaxLength) {
+  nsTArray<uint8_t> buf;
+  bool rv = ReadIntoArray(aFile, buf, aMaxLength);
+  if (rv) {
+    buf.AppendElement(0);  // Append null terminator, required by nsC*String.
+    aOutDst = nsDependentCString((const char*)buf.Elements(), buf.Length() - 1);
+  }
+  return rv;
+}
+
+bool GMPInfoFileParser::Init(nsIFile* aInfoFile) {
+  nsTArray<nsCString> lines;
+  static const size_t MAX_GMP_INFO_FILE_LENGTH = 5 * 1024;
+
+  nsAutoCString info;
+  if (!ReadIntoString(aInfoFile, info, MAX_GMP_INFO_FILE_LENGTH)) {
+    NS_WARNING("Failed to read info file in GMP process.");
+    return false;
+  }
+
+  // Note: we pass "\r\n" to SplitAt so that we'll split lines delimited
+  // by \n (Unix), \r\n (Windows) and \r (old MacOSX).
+  SplitAt("\r\n", info, lines);
+
+  for (nsCString line : lines) {
+    // Field name is the string up to but not including the first ':'
+    // character on the line.
+    int32_t colon = line.FindChar(':');
+    if (colon <= 0) {
+      // Not allowed to be the first character.
+      // Info field name must be at least one character.
+      continue;
+    }
+    nsAutoCString key(Substring(line, 0, colon));
+    ToLowerCase(key);
+    key.Trim(" ");
+
+    auto value = MakeUnique<nsCString>(Substring(line, colon + 1));
+    value->Trim(" ");
+    mValues.InsertOrUpdate(
+        key,
+        std::move(value));  // Hashtable assumes ownership of value.
+  }
+
+  return true;
+}
+
+bool GMPInfoFileParser::Contains(const nsCString& aKey) const {
+  nsCString key(aKey);
+  ToLowerCase(key);
+  return mValues.Contains(key);
+}
+
+nsCString GMPInfoFileParser::Get(const nsCString& aKey) const {
+  MOZ_ASSERT(Contains(aKey));
+  nsCString key(aKey);
+  ToLowerCase(key);
+  nsCString* p = nullptr;
+  if (mValues.Get(key, &p)) {
+    return nsCString(*p);
+  }
+  return ""_ns;
+}
+
+bool HaveGMPFor(const nsCString& aAPI, nsTArray<nsCString>&& aTags) {
+  nsCOMPtr<mozIGeckoMediaPluginService> mps =
+      do_GetService("@mozilla.org/gecko-media-plugin-service;1");
+  if (NS_WARN_IF(!mps)) {
+    return false;
+  }
+
+  bool hasPlugin = false;
+  if (NS_FAILED(mps->HasPluginForAPI(aAPI, &aTags, &hasPlugin))) {
+    return false;
+  }
+  return hasPlugin;
+}
+
+void LogToConsole(const nsAString& aMsg) {
+  nsCOMPtr<nsIConsoleService> console(
+      do_GetService("@mozilla.org/consoleservice;1"));
+  if (!console) {
+    NS_WARNING("Failed to log message to console.");
+    return;
+  }
+  nsAutoString msg(aMsg);
+  console->LogStringMessage(msg.get());
+}
+
+already_AddRefed<nsISerialEventTarget> GetGMPThread() {
+  RefPtr<gmp::GeckoMediaPluginService> service =
+      gmp::GeckoMediaPluginService::GetGeckoMediaPluginService();
+  nsCOMPtr<nsISerialEventTarget> thread =
+      service ? service->GetGMPThread() : nullptr;
+  return thread.forget();
+}
+
+static size_t Align16(size_t aNumber) {
+  const size_t mask = 15;  // Alignment - 1.
+  return (aNumber + mask) & ~mask;
+}
+
+size_t I420FrameBufferSizePadded(int32_t aWidth, int32_t aHeight) {
+  if (aWidth <= 0 || aHeight <= 0 || aWidth > MAX_VIDEO_WIDTH ||
+      aHeight > MAX_VIDEO_HEIGHT) {
+    return 0;
+  }
+
+  size_t ySize = Align16(aWidth) * Align16(aHeight);
+  return ySize + (ySize / 4) * 2;
+}
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/GMPUtils.h b/dom/media/gmp/GMPUtils.h
new file mode 100644
index 0000000000..020dba30d0
--- /dev/null
+++ b/dom/media/gmp/GMPUtils.h
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPUtils_h_
+#define GMPUtils_h_
+
+#include "mozilla/AbstractThread.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "nsCOMPtr.h"
+#include "nsClassHashtable.h"
+#include "nsStringFwd.h"
+#include "nsTArray.h"
+
+#define CHROMIUM_CDM_API_BACKWARD_COMPAT "chromium-cdm9-host4"
+#define CHROMIUM_CDM_API "chromium-cdm10-host4"
+
+class nsIFile;
+class nsIDirectoryEnumerator;
+
+namespace mozilla {
+
+template <typename T>
+struct DestroyPolicy {
+  void operator()(T* aGMPObject) const { aGMPObject->Destroy(); }
+};
+
+template <typename T>
+using GMPUniquePtr = mozilla::UniquePtr<T, DestroyPolicy<T>>;
+
+void SplitAt(const char* aDelims, const nsACString& aInput,
+             nsTArray<nsCString>& aOutTokens);
+
+nsCString ToHexString(const nsTArray<uint8_t>& aBytes);
+
+nsCString ToHexString(const uint8_t* aBytes, uint32_t aLength);
+
+bool FileExists(nsIFile* aFile);
+
+// Enumerate directory entries for a specified path.
+class DirectoryEnumerator {
+ public:
+  enum Mode {
+    DirsOnly,     // Enumeration only includes directories.
+    FilesAndDirs  // Enumeration includes directories and non-directory files.
+  };
+
+  DirectoryEnumerator(nsIFile* aPath, Mode aMode);
+
+  already_AddRefed<nsIFile> Next();
+
+ private:
+  Mode mMode;
+  nsCOMPtr<nsIDirectoryEnumerator> mIter;
+};
+
+class GMPInfoFileParser {
+ public:
+  bool Init(nsIFile* aFile);
+  bool Contains(const nsCString& aKey) const;
+  nsCString Get(const nsCString& aKey) const;
+
+ private:
+  nsClassHashtable<nsCStringHashKey, nsCString> mValues;
+};
+
+bool ReadIntoString(nsIFile* aFile, nsCString& aOutDst, size_t aMaxLength);
+
+bool HaveGMPFor(const nsCString& aAPI, nsTArray<nsCString>&& aTags);
+
+void LogToConsole(const nsAString& aMsg);
+
+already_AddRefed<nsISerialEventTarget> GetGMPThread();
+
+// Returns the number of bytes required to store an aWidth x aHeight image in
+// I420 format, padded so that the width and height are multiples of 16.
+size_t I420FrameBufferSizePadded(int32_t aWidth, int32_t aHeight);
+
+}  // namespace mozilla
+
+#endif
diff --git a/dom/media/gmp/GMPVideoDecoderChild.cpp b/dom/media/gmp/GMPVideoDecoderChild.cpp
new file mode 100644
index 0000000000..0f605cca9b
--- /dev/null
+++ b/dom/media/gmp/GMPVideoDecoderChild.cpp
@@ -0,0 +1,210 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPVideoDecoderChild.h"
+#include "GMPVideoi420FrameImpl.h"
+#include "GMPContentChild.h"
+#include <stdio.h>
+#include "mozilla/Unused.h"
+#include "GMPVideoEncodedFrameImpl.h"
+#include "runnable_utils.h"
+
+namespace mozilla::gmp {
+
+GMPVideoDecoderChild::GMPVideoDecoderChild(GMPContentChild* aPlugin)
+    : GMPSharedMemManager(aPlugin),
+      mPlugin(aPlugin),
+      mVideoDecoder(nullptr),
+      mVideoHost(this),
+      mNeedShmemIntrCount(0),
+      mPendingDecodeComplete(false) {
+  MOZ_ASSERT(mPlugin);
+}
+
+GMPVideoDecoderChild::~GMPVideoDecoderChild() {
+  MOZ_ASSERT(!mNeedShmemIntrCount);
+}
+
+void GMPVideoDecoderChild::Init(GMPVideoDecoder* aDecoder) {
+  MOZ_ASSERT(aDecoder,
+             "Cannot initialize video decoder child without a video decoder!");
+  mVideoDecoder = aDecoder;
+}
+
+GMPVideoHostImpl& GMPVideoDecoderChild::Host() { return mVideoHost; }
+
+void GMPVideoDecoderChild::Decoded(GMPVideoi420Frame* aDecodedFrame) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  if (!aDecodedFrame) {
+    MOZ_CRASH("Not given a decoded frame!");
+  }
+
+  auto df = static_cast<GMPVideoi420FrameImpl*>(aDecodedFrame);
+
+  GMPVideoi420FrameData frameData;
+  df->InitFrameData(frameData);
+  SendDecoded(frameData);
+
+  aDecodedFrame->Destroy();
+}
+
+void GMPVideoDecoderChild::ReceivedDecodedReferenceFrame(
+    const uint64_t aPictureId) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  SendReceivedDecodedReferenceFrame(aPictureId);
+}
+
+void GMPVideoDecoderChild::ReceivedDecodedFrame(const uint64_t aPictureId) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  SendReceivedDecodedFrame(aPictureId);
+}
+
+void GMPVideoDecoderChild::InputDataExhausted() {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  SendInputDataExhausted();
+}
+
+void GMPVideoDecoderChild::DrainComplete() {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  SendDrainComplete();
+}
+
+void GMPVideoDecoderChild::ResetComplete() {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  SendResetComplete();
+}
+
+void GMPVideoDecoderChild::Error(GMPErr aError) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  SendError(aError);
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderChild::RecvInitDecode(
+    const GMPVideoCodec& aCodecSettings, nsTArray<uint8_t>&& aCodecSpecific,
+    const int32_t& aCoreCount) {
+  if (!mVideoDecoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoDecoder->InitDecode(aCodecSettings, aCodecSpecific.Elements(),
+                            aCodecSpecific.Length(), this, aCoreCount);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderChild::RecvDecode(
+    const GMPVideoEncodedFrameData& aInputFrame, const bool& aMissingFrames,
+    nsTArray<uint8_t>&& aCodecSpecificInfo, const int64_t& aRenderTimeMs) {
+  if (!mVideoDecoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  auto f = new GMPVideoEncodedFrameImpl(aInputFrame, &mVideoHost);
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoDecoder->Decode(f, aMissingFrames, aCodecSpecificInfo.Elements(),
+                        aCodecSpecificInfo.Length(), aRenderTimeMs);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderChild::RecvChildShmemForPool(
+    Shmem&& aFrameBuffer) {
+  if (aFrameBuffer.IsWritable()) {
+    mVideoHost.SharedMemMgr()->MgrDeallocShmem(GMPSharedMem::kGMPFrameData,
+                                               aFrameBuffer);
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderChild::RecvReset() {
+  if (!mVideoDecoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoDecoder->Reset();
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderChild::RecvDrain() {
+  if (!mVideoDecoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoDecoder->Drain();
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderChild::RecvDecodingComplete() {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  if (mNeedShmemIntrCount) {
+    // There's a GMP blocked in Alloc() waiting for the CallNeedShem() to
+    // return a frame they can use. Don't call the GMP's DecodingComplete()
+    // now and don't delete the GMPVideoDecoderChild, defer processing the
+    // DecodingComplete() until once the Alloc() finishes.
+    mPendingDecodeComplete = true;
+    return IPC_OK();
+  }
+  if (mVideoDecoder) {
+    // Ignore any return code. It is OK for this to fail without killing the
+    // process.
+    mVideoDecoder->DecodingComplete();
+    mVideoDecoder = nullptr;
+  }
+
+  mVideoHost.DoneWithAPI();
+
+  mPlugin = nullptr;
+
+  Unused << Send__delete__(this);
+
+  return IPC_OK();
+}
+
+bool GMPVideoDecoderChild::Alloc(size_t aSize, Shmem* aMem) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  bool rv;
+#ifndef SHMEM_ALLOC_IN_CHILD
+  ++mNeedShmemIntrCount;
+  rv = SendNeedShmem(aSize, aMem);
+  --mNeedShmemIntrCount;
+  if (mPendingDecodeComplete && mNeedShmemIntrCount == 0) {
+    mPendingDecodeComplete = false;
+    mPlugin->GMPMessageLoop()->PostTask(
+        NewRunnableMethod("gmp::GMPVideoDecoderChild::RecvDecodingComplete",
+                          this, &GMPVideoDecoderChild::RecvDecodingComplete));
+  }
+#else
+  rv = AllocShmem(aSize, aType, aMem);
+#endif
+  return rv;
+}
+
+void GMPVideoDecoderChild::Dealloc(Shmem&& aMem) {
+#ifndef SHMEM_ALLOC_IN_CHILD
+  SendParentShmemForPool(std::move(aMem));
+#else
+  DeallocShmem(aMem);
+#endif
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPVideoDecoderChild.h b/dom/media/gmp/GMPVideoDecoderChild.h
new file mode 100644
index 0000000000..3c74e5f02c
--- /dev/null
+++ b/dom/media/gmp/GMPVideoDecoderChild.h
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoDecoderChild_h_
+#define GMPVideoDecoderChild_h_
+
+#include "nsString.h"
+#include "mozilla/gmp/PGMPVideoDecoderChild.h"
+#include "gmp-video-decode.h"
+#include "GMPSharedMemManager.h"
+#include "GMPVideoHost.h"
+#include "mozilla/gmp/GMPTypes.h"
+
+namespace mozilla::gmp {
+
+class GMPContentChild;
+
+class GMPVideoDecoderChild : public PGMPVideoDecoderChild,
+                             public GMPVideoDecoderCallback,
+                             public GMPSharedMemManager {
+  friend class PGMPVideoDecoderChild;
+
+ public:
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PGMPVideoDecoderChild.
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPVideoDecoderChild, final);
+
+  explicit GMPVideoDecoderChild(GMPContentChild* aPlugin);
+
+  void Init(GMPVideoDecoder* aDecoder);
+  GMPVideoHostImpl& Host();
+
+  // GMPVideoDecoderCallback
+  void Decoded(GMPVideoi420Frame* decodedFrame) override;
+  void ReceivedDecodedReferenceFrame(const uint64_t pictureId) override;
+  void ReceivedDecodedFrame(const uint64_t pictureId) override;
+  void InputDataExhausted() override;
+  void DrainComplete() override;
+  void ResetComplete() override;
+  void Error(GMPErr aError) override;
+
+  // GMPSharedMemManager
+  bool Alloc(size_t aSize, Shmem* aMem) override;
+  void Dealloc(Shmem&& aMem) override;
+
+ private:
+  virtual ~GMPVideoDecoderChild();
+
+  // PGMPVideoDecoderChild
+  mozilla::ipc::IPCResult RecvInitDecode(const GMPVideoCodec& aCodecSettings,
+                                         nsTArray<uint8_t>&& aCodecSpecific,
+                                         const int32_t& aCoreCount);
+  mozilla::ipc::IPCResult RecvDecode(
+      const GMPVideoEncodedFrameData& aInputFrame, const bool& aMissingFrames,
+      nsTArray<uint8_t>&& aCodecSpecificInfo, const int64_t& aRenderTimeMs);
+  mozilla::ipc::IPCResult RecvChildShmemForPool(Shmem&& aFrameBuffer);
+  mozilla::ipc::IPCResult RecvReset();
+  mozilla::ipc::IPCResult RecvDrain();
+  mozilla::ipc::IPCResult RecvDecodingComplete();
+
+  GMPContentChild* mPlugin;
+  GMPVideoDecoder* mVideoDecoder;
+  GMPVideoHostImpl mVideoHost;
+
+  // Non-zero when a GMP is blocked spinning the IPC message loop while
+  // waiting on an NeedShmem to complete.
+  int mNeedShmemIntrCount;
+  bool mPendingDecodeComplete;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPVideoDecoderChild_h_
diff --git a/dom/media/gmp/GMPVideoDecoderParent.cpp b/dom/media/gmp/GMPVideoDecoderParent.cpp
new file mode 100644
index 0000000000..4732a99930
--- /dev/null
+++ b/dom/media/gmp/GMPVideoDecoderParent.cpp
@@ -0,0 +1,451 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPVideoDecoderParent.h"
+
+#include "GMPContentParent.h"
+#include "GMPUtils.h"
+#include "GMPLog.h"
+#include "GMPMessageUtils.h"
+#include "GMPVideoEncodedFrameImpl.h"
+#include "GMPVideoi420FrameImpl.h"
+#include "mozilla/gmp/GMPTypes.h"
+#include "mozilla/Unused.h"
+#include "nsAutoRef.h"
+#include "nsPrintfCString.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla::gmp {
+
+// States:
+// Initial: mIsOpen == false
+//    on InitDecode success -> Open
+//    on Shutdown -> Dead
+// Open: mIsOpen == true
+//    on Close -> Dead
+//    on ActorDestroy -> Dead
+//    on Shutdown -> Dead
+// Dead: mIsOpen == false
+
+GMPVideoDecoderParent::GMPVideoDecoderParent(GMPContentParent* aPlugin)
+    : GMPSharedMemManager(aPlugin),
+      mIsOpen(false),
+      mShuttingDown(false),
+      mActorDestroyed(false),
+      mIsAwaitingResetComplete(false),
+      mIsAwaitingDrainComplete(false),
+      mPlugin(aPlugin),
+      mCallback(nullptr),
+      mVideoHost(this),
+      mPluginId(aPlugin->GetPluginId()),
+      mFrameCount(0) {
+  MOZ_ASSERT(mPlugin);
+}
+
+GMPVideoDecoderParent::~GMPVideoDecoderParent() = default;
+
+GMPVideoHostImpl& GMPVideoDecoderParent::Host() { return mVideoHost; }
+
+// Note: may be called via Terminated()
+void GMPVideoDecoderParent::Close() {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::Close()", this);
+  MOZ_ASSERT(!mPlugin || mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  // Ensure if we've received a Close while waiting for a ResetComplete
+  // or DrainComplete notification, we'll unblock the caller before processing
+  // the close. This seems unlikely to happen, but better to be careful.
+  UnblockResetAndDrain();
+
+  // Consumer is done with us; we can shut down.  No more callbacks should
+  // be made to mCallback.  Note: do this before Shutdown()!
+  mCallback = nullptr;
+  // Let Shutdown mark us as dead so it knows if we had been alive
+
+  // In case this is the last reference
+  RefPtr<GMPVideoDecoderParent> kungfudeathgrip(this);
+  Release();
+  Shutdown();
+}
+
+nsresult GMPVideoDecoderParent::InitDecode(
+    const GMPVideoCodec& aCodecSettings,
+    const nsTArray<uint8_t>& aCodecSpecific,
+    GMPVideoDecoderCallbackProxy* aCallback, int32_t aCoreCount) {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::InitDecode()", this);
+
+  if (mActorDestroyed) {
+    NS_WARNING("Trying to use a destroyed GMP video decoder!");
+    return NS_ERROR_FAILURE;
+  }
+  if (mIsOpen) {
+    NS_WARNING("Trying to re-init an in-use GMP video decoder!");
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  if (!aCallback) {
+    return NS_ERROR_FAILURE;
+  }
+  mCallback = aCallback;
+
+  if (!SendInitDecode(aCodecSettings, aCodecSpecific, aCoreCount)) {
+    return NS_ERROR_FAILURE;
+  }
+  mIsOpen = true;
+
+  // Async IPC, we don't have access to a return value.
+  return NS_OK;
+}
+
+nsresult GMPVideoDecoderParent::Decode(
+    GMPUniquePtr<GMPVideoEncodedFrame> aInputFrame, bool aMissingFrames,
+    const nsTArray<uint8_t>& aCodecSpecificInfo, int64_t aRenderTimeMs) {
+  GMP_LOG_VERBOSE(
+      "GMPVideoDecoderParent[%p]::Decode() timestamp=%" PRId64 " keyframe=%d",
+      this, aInputFrame->TimeStamp(), aInputFrame->FrameType() == kGMPKeyFrame);
+
+  if (!mIsOpen) {
+    GMP_LOG_ERROR(
+        "GMPVideoDecoderParent[%p]::Decode() ERROR; dead GMPVideoDecoder",
+        this);
+    NS_WARNING("Trying to use an dead GMP video decoder");
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  GMPUniquePtr<GMPVideoEncodedFrameImpl> inputFrameImpl(
+      static_cast<GMPVideoEncodedFrameImpl*>(aInputFrame.release()));
+
+  // Very rough kill-switch if the plugin stops processing.  If it's merely
+  // hung and continues, we'll come back to life eventually.
+  // 3* is because we're using 3 buffers per frame for i420 data for now.
+  if ((NumInUse(GMPSharedMem::kGMPFrameData) >
+       3 * GMPSharedMem::kGMPBufLimit) ||
+      (NumInUse(GMPSharedMem::kGMPEncodedData) > GMPSharedMem::kGMPBufLimit)) {
+    GMP_LOG_ERROR(
+        "GMPVideoDecoderParent[%p]::Decode() ERROR; shmem buffer limit hit "
+        "frame=%d encoded=%d",
+        this, NumInUse(GMPSharedMem::kGMPFrameData),
+        NumInUse(GMPSharedMem::kGMPEncodedData));
+    return NS_ERROR_FAILURE;
+  }
+
+  GMPVideoEncodedFrameData frameData;
+  inputFrameImpl->RelinquishFrameData(frameData);
+
+  if (!SendDecode(frameData, aMissingFrames, aCodecSpecificInfo,
+                  aRenderTimeMs)) {
+    GMP_LOG_ERROR(
+        "GMPVideoDecoderParent[%p]::Decode() ERROR; SendDecode() failure.",
+        this);
+    return NS_ERROR_FAILURE;
+  }
+  mFrameCount++;
+
+  // Async IPC, we don't have access to a return value.
+  return NS_OK;
+}
+
+nsresult GMPVideoDecoderParent::Reset() {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::Reset()", this);
+
+  if (!mIsOpen) {
+    NS_WARNING("Trying to use an dead GMP video decoder");
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  if (!SendReset()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  mIsAwaitingResetComplete = true;
+
+  RefPtr<GMPVideoDecoderParent> self(this);
+  nsCOMPtr<nsIRunnable> task = NS_NewRunnableFunction(
+      "gmp::GMPVideoDecoderParent::Reset", [self]() -> void {
+        GMP_LOG_DEBUG(
+            "GMPVideoDecoderParent[%p]::ResetCompleteTimeout() timed out "
+            "waiting for ResetComplete",
+            self.get());
+        self->mResetCompleteTimeout = nullptr;
+        LogToBrowserConsole(nsLiteralString(
+            u"GMPVideoDecoderParent timed out waiting for ResetComplete()"));
+      });
+  CancelResetCompleteTimeout();
+  nsCOMPtr<nsISerialEventTarget> target = mPlugin->GMPEventTarget();
+  mResetCompleteTimeout = SimpleTimer::Create(task, 5000, target);
+
+  // Async IPC, we don't have access to a return value.
+  return NS_OK;
+}
+
+void GMPVideoDecoderParent::CancelResetCompleteTimeout() {
+  if (mResetCompleteTimeout) {
+    mResetCompleteTimeout->Cancel();
+    mResetCompleteTimeout = nullptr;
+  }
+}
+
+nsresult GMPVideoDecoderParent::Drain() {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::Drain() frameCount=%d", this,
+                mFrameCount);
+
+  if (!mIsOpen) {
+    NS_WARNING("Trying to use an dead GMP video decoder");
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  if (!SendDrain()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  mIsAwaitingDrainComplete = true;
+
+  // Async IPC, we don't have access to a return value.
+  return NS_OK;
+}
+
+const nsCString& GMPVideoDecoderParent::GetDisplayName() const {
+  if (!mIsOpen) {
+    NS_WARNING("Trying to use an dead GMP video decoder");
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  return mPlugin->GetDisplayName();
+}
+
+// Note: Consider keeping ActorDestroy sync'd up when making changes here.
+nsresult GMPVideoDecoderParent::Shutdown() {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::Shutdown()", this);
+  MOZ_ASSERT(!mPlugin || mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  if (mShuttingDown) {
+    return NS_OK;
+  }
+  mShuttingDown = true;
+
+  // Ensure if we've received a shutdown while waiting for a ResetComplete
+  // or DrainComplete notification, we'll unblock the caller before processing
+  // the shutdown.
+  UnblockResetAndDrain();
+
+  // Notify client we're gone!  Won't occur after Close()
+  if (mCallback) {
+    mCallback->Terminated();
+    mCallback = nullptr;
+  }
+
+  mIsOpen = false;
+  if (!mActorDestroyed) {
+    Unused << SendDecodingComplete();
+  }
+
+  return NS_OK;
+}
+
+// Note: Keep this sync'd up with Shutdown
+void GMPVideoDecoderParent::ActorDestroy(ActorDestroyReason aWhy) {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::ActorDestroy reason=%d", this,
+                aWhy);
+
+  mIsOpen = false;
+  mActorDestroyed = true;
+
+  // Ensure if we've received a destroy while waiting for a ResetComplete
+  // or DrainComplete notification, we'll unblock the caller before processing
+  // the error.
+  UnblockResetAndDrain();
+
+  if (mCallback) {
+    // May call Close() (and Shutdown()) immediately or with a delay
+    mCallback->Terminated();
+    mCallback = nullptr;
+  }
+  if (mPlugin) {
+    // Ignore any return code. It is OK for this to fail without killing the
+    // process.
+    mPlugin->VideoDecoderDestroyed(this);
+    mPlugin = nullptr;
+  }
+  mVideoHost.ActorDestroyed();
+  MaybeDisconnect(aWhy == AbnormalShutdown);
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvDecoded(
+    const GMPVideoi420FrameData& aDecodedFrame) {
+  --mFrameCount;
+  GMP_LOG_VERBOSE("GMPVideoDecoderParent[%p]::RecvDecoded() timestamp=%" PRId64
+                  " frameCount=%d",
+                  this, aDecodedFrame.mTimestamp(), mFrameCount);
+
+  if (mCallback) {
+    if (GMPVideoi420FrameImpl::CheckFrameData(aDecodedFrame)) {
+      auto f = new GMPVideoi420FrameImpl(aDecodedFrame, &mVideoHost);
+
+      mCallback->Decoded(f);
+    } else {
+      GMP_LOG_ERROR(
+          "GMPVideoDecoderParent[%p]::RecvDecoded() "
+          "timestamp=%" PRId64 " decoded frame corrupt, ignoring",
+          this, aDecodedFrame.mTimestamp());
+      // TODO: Verify if we should take more serious the arrival of
+      // a corrupted frame, see bug 1750506.
+    }
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult
+GMPVideoDecoderParent::RecvReceivedDecodedReferenceFrame(
+    const uint64_t& aPictureId) {
+  if (mCallback) {
+    mCallback->ReceivedDecodedReferenceFrame(aPictureId);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvReceivedDecodedFrame(
+    const uint64_t& aPictureId) {
+  if (mCallback) {
+    mCallback->ReceivedDecodedFrame(aPictureId);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvInputDataExhausted() {
+  GMP_LOG_VERBOSE("GMPVideoDecoderParent[%p]::RecvInputDataExhausted()", this);
+
+  if (mCallback) {
+    mCallback->InputDataExhausted();
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvDrainComplete() {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::RecvDrainComplete() frameCount=%d",
+                this, mFrameCount);
+  nsAutoString msg;
+  msg.AppendLiteral(
+      "GMPVideoDecoderParent::RecvDrainComplete() outstanding frames=");
+  msg.AppendInt(mFrameCount);
+  LogToBrowserConsole(msg);
+
+  if (mCallback && mIsAwaitingDrainComplete) {
+    mIsAwaitingDrainComplete = false;
+
+    mCallback->DrainComplete();
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvResetComplete() {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::RecvResetComplete()", this);
+
+  CancelResetCompleteTimeout();
+
+  if (mCallback && mIsAwaitingResetComplete) {
+    mIsAwaitingResetComplete = false;
+    mFrameCount = 0;
+
+    mCallback->ResetComplete();
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvError(const GMPErr& aError) {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::RecvError(error=%d)", this, aError);
+
+  if (mCallback) {
+    // Ensure if we've received an error while waiting for a ResetComplete
+    // or DrainComplete notification, we'll unblock the caller before processing
+    // the error.
+    UnblockResetAndDrain();
+
+    mCallback->Error(aError);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvShutdown() {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::RecvShutdown()", this);
+
+  Shutdown();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvParentShmemForPool(
+    Shmem&& aEncodedBuffer) {
+  if (aEncodedBuffer.IsWritable()) {
+    mVideoHost.SharedMemMgr()->MgrDeallocShmem(GMPSharedMem::kGMPEncodedData,
+                                               aEncodedBuffer);
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::RecvNeedShmem(
+    const uint32_t& aFrameBufferSize, Shmem* aMem) {
+  ipc::Shmem mem;
+
+  if (!mVideoHost.SharedMemMgr()->MgrAllocShmem(GMPSharedMem::kGMPFrameData,
+                                                aFrameBufferSize, &mem)) {
+    GMP_LOG_ERROR("%s: Failed to get a shared mem buffer for Child! size %u",
+                  __FUNCTION__, aFrameBufferSize);
+    return IPC_FAIL(this, "Failed to get a shared mem buffer for Child!");
+  }
+  *aMem = mem;
+  mem = ipc::Shmem();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoDecoderParent::Recv__delete__() {
+  GMP_LOG_DEBUG("GMPVideoDecoderParent[%p]::Recv__delete__()", this);
+
+  if (mPlugin) {
+    // Ignore any return code. It is OK for this to fail without killing the
+    // process.
+    mPlugin->VideoDecoderDestroyed(this);
+    mPlugin = nullptr;
+  }
+
+  return IPC_OK();
+}
+
+void GMPVideoDecoderParent::UnblockResetAndDrain() {
+  GMP_LOG_DEBUG(
+      "GMPVideoDecoderParent[%p]::UnblockResetAndDrain() "
+      "awaitingResetComplete=%d awaitingDrainComplete=%d",
+      this, mIsAwaitingResetComplete, mIsAwaitingDrainComplete);
+
+  if (!mCallback) {
+    MOZ_ASSERT(!mIsAwaitingResetComplete);
+    MOZ_ASSERT(!mIsAwaitingDrainComplete);
+    return;
+  }
+  if (mIsAwaitingResetComplete) {
+    mIsAwaitingResetComplete = false;
+    mCallback->ResetComplete();
+  }
+  if (mIsAwaitingDrainComplete) {
+    mIsAwaitingDrainComplete = false;
+    mCallback->DrainComplete();
+  }
+  CancelResetCompleteTimeout();
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPVideoDecoderParent.h b/dom/media/gmp/GMPVideoDecoderParent.h
new file mode 100644
index 0000000000..10f92b0d76
--- /dev/null
+++ b/dom/media/gmp/GMPVideoDecoderParent.h
@@ -0,0 +1,101 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoDecoderParent_h_
+#define GMPVideoDecoderParent_h_
+
+#include "mozilla/RefPtr.h"
+#include "gmp-video-decode.h"
+#include "mozilla/gmp/PGMPVideoDecoderParent.h"
+#include "GMPMessageUtils.h"
+#include "GMPSharedMemManager.h"
+#include "GMPUtils.h"
+#include "GMPVideoHost.h"
+#include "GMPVideoDecoderProxy.h"
+#include "VideoUtils.h"
+#include "GMPCrashHelperHolder.h"
+
+namespace mozilla::gmp {
+
+class GMPContentParent;
+
+class GMPVideoDecoderParent final : public PGMPVideoDecoderParent,
+                                    public GMPVideoDecoderProxy,
+                                    public GMPSharedMemManager,
+                                    public GMPCrashHelperHolder {
+  friend class PGMPVideoDecoderParent;
+
+ public:
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PGMPVideoDecoderParent.
+  NS_INLINE_DECL_REFCOUNTING(GMPVideoDecoderParent, final)
+
+  explicit GMPVideoDecoderParent(GMPContentParent* aPlugin);
+
+  GMPVideoHostImpl& Host();
+  nsresult Shutdown();
+
+  // GMPVideoDecoder
+  void Close() override;
+  nsresult InitDecode(const GMPVideoCodec& aCodecSettings,
+                      const nsTArray<uint8_t>& aCodecSpecific,
+                      GMPVideoDecoderCallbackProxy* aCallback,
+                      int32_t aCoreCount) override;
+  nsresult Decode(GMPUniquePtr<GMPVideoEncodedFrame> aInputFrame,
+                  bool aMissingFrames,
+                  const nsTArray<uint8_t>& aCodecSpecificInfo,
+                  int64_t aRenderTimeMs = -1) override;
+  nsresult Reset() override;
+  nsresult Drain() override;
+  uint32_t GetPluginId() const override { return mPluginId; }
+  const nsCString& GetDisplayName() const override;
+
+  // GMPSharedMemManager
+  bool Alloc(size_t aSize, Shmem* aMem) override {
+    return AllocShmem(aSize, aMem);
+  }
+  void Dealloc(Shmem&& aMem) override { DeallocShmem(aMem); }
+
+ private:
+  ~GMPVideoDecoderParent();
+
+  // PGMPVideoDecoderParent
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+  mozilla::ipc::IPCResult RecvDecoded(
+      const GMPVideoi420FrameData& aDecodedFrame) override;
+  mozilla::ipc::IPCResult RecvReceivedDecodedReferenceFrame(
+      const uint64_t& aPictureId) override;
+  mozilla::ipc::IPCResult RecvReceivedDecodedFrame(
+      const uint64_t& aPictureId) override;
+  mozilla::ipc::IPCResult RecvInputDataExhausted() override;
+  mozilla::ipc::IPCResult RecvDrainComplete() override;
+  mozilla::ipc::IPCResult RecvResetComplete() override;
+  mozilla::ipc::IPCResult RecvError(const GMPErr& aError) override;
+  mozilla::ipc::IPCResult RecvShutdown() override;
+  mozilla::ipc::IPCResult RecvParentShmemForPool(
+      Shmem&& aEncodedBuffer) override;
+  mozilla::ipc::IPCResult RecvNeedShmem(const uint32_t& aFrameBufferSize,
+                                        Shmem* aMem) override;
+  mozilla::ipc::IPCResult Recv__delete__() override;
+
+  void UnblockResetAndDrain();
+  void CancelResetCompleteTimeout();
+
+  bool mIsOpen;
+  bool mShuttingDown;
+  bool mActorDestroyed;
+  bool mIsAwaitingResetComplete;
+  bool mIsAwaitingDrainComplete;
+  RefPtr<GMPContentParent> mPlugin;
+  GMPVideoDecoderCallbackProxy* mCallback;
+  GMPVideoHostImpl mVideoHost;
+  const uint32_t mPluginId;
+  int32_t mFrameCount;
+  RefPtr<SimpleTimer> mResetCompleteTimeout;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPVideoDecoderParent_h_
diff --git a/dom/media/gmp/GMPVideoDecoderProxy.h b/dom/media/gmp/GMPVideoDecoderProxy.h
new file mode 100644
index 0000000000..2049ea0082
--- /dev/null
+++ b/dom/media/gmp/GMPVideoDecoderProxy.h
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoDecoderProxy_h_
+#define GMPVideoDecoderProxy_h_
+
+#include "nsTArray.h"
+#include "gmp-video-decode.h"
+#include "gmp-video-frame-i420.h"
+#include "gmp-video-frame-encoded.h"
+
+#include "GMPCallbackBase.h"
+#include "GMPUtils.h"
+
+class GMPVideoDecoderCallbackProxy : public GMPCallbackBase,
+                                     public GMPVideoDecoderCallback {
+ public:
+  virtual ~GMPVideoDecoderCallbackProxy() = default;
+};
+
+// A proxy to GMPVideoDecoder in the child process.
+// GMPVideoDecoderParent exposes this to users the GMP.
+// This enables Gecko to pass nsTArrays to the child GMP and avoid
+// an extra copy when doing so.
+
+// The consumer must call Close() when done with the codec, or when
+// Terminated() is called by the GMP plugin indicating an abnormal shutdown
+// of the underlying plugin.  After calling Close(), the consumer must
+// not access this again.
+
+// This interface is not thread-safe and must only be used from GMPThread.
+class GMPVideoDecoderProxy {
+ public:
+  virtual nsresult InitDecode(const GMPVideoCodec& aCodecSettings,
+                              const nsTArray<uint8_t>& aCodecSpecific,
+                              GMPVideoDecoderCallbackProxy* aCallback,
+                              int32_t aCoreCount) = 0;
+  virtual nsresult Decode(
+      mozilla::GMPUniquePtr<GMPVideoEncodedFrame> aInputFrame,
+      bool aMissingFrames, const nsTArray<uint8_t>& aCodecSpecificInfo,
+      int64_t aRenderTimeMs = -1) = 0;
+  virtual nsresult Reset() = 0;
+  virtual nsresult Drain() = 0;
+  virtual uint32_t GetPluginId() const = 0;
+
+  // Call to tell GMP/plugin the consumer will no longer use this
+  // interface/codec.
+  virtual void Close() = 0;
+
+  virtual const nsCString& GetDisplayName() const = 0;
+};
+
+#endif
diff --git a/dom/media/gmp/GMPVideoEncodedFrameImpl.cpp b/dom/media/gmp/GMPVideoEncodedFrameImpl.cpp
new file mode 100644
index 0000000000..c0ed87df4d
--- /dev/null
+++ b/dom/media/gmp/GMPVideoEncodedFrameImpl.cpp
@@ -0,0 +1,226 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPVideoEncodedFrameImpl.h"
+#include "GMPVideoHost.h"
+#include "mozilla/gmp/GMPTypes.h"
+#include "GMPSharedMemManager.h"
+
+namespace mozilla::gmp {
+
+GMPVideoEncodedFrameImpl::GMPVideoEncodedFrameImpl(GMPVideoHostImpl* aHost)
+    : mEncodedWidth(0),
+      mEncodedHeight(0),
+      mTimeStamp(0ll),
+      mDuration(0ll),
+      mFrameType(kGMPDeltaFrame),
+      mSize(0),
+      mCompleteFrame(false),
+      mHost(aHost),
+      mBufferType(GMP_BufferSingle) {
+  MOZ_ASSERT(aHost);
+  aHost->EncodedFrameCreated(this);
+}
+
+GMPVideoEncodedFrameImpl::GMPVideoEncodedFrameImpl(
+    const GMPVideoEncodedFrameData& aFrameData, GMPVideoHostImpl* aHost)
+    : mEncodedWidth(aFrameData.mEncodedWidth()),
+      mEncodedHeight(aFrameData.mEncodedHeight()),
+      mTimeStamp(aFrameData.mTimestamp()),
+      mDuration(aFrameData.mDuration()),
+      mFrameType(static_cast<GMPVideoFrameType>(aFrameData.mFrameType())),
+      mSize(aFrameData.mSize()),
+      mCompleteFrame(aFrameData.mCompleteFrame()),
+      mHost(aHost),
+      mBuffer(aFrameData.mBuffer()),
+      mBufferType(aFrameData.mBufferType()) {
+  MOZ_ASSERT(aHost);
+  aHost->EncodedFrameCreated(this);
+}
+
+GMPVideoEncodedFrameImpl::~GMPVideoEncodedFrameImpl() {
+  DestroyBuffer();
+  if (mHost) {
+    mHost->EncodedFrameDestroyed(this);
+  }
+}
+
+GMPVideoFrameFormat GMPVideoEncodedFrameImpl::GetFrameFormat() {
+  return kGMPEncodedVideoFrame;
+}
+
+void GMPVideoEncodedFrameImpl::DoneWithAPI() {
+  DestroyBuffer();
+
+  // Do this after destroying the buffer because destruction
+  // involves deallocation, which requires a host.
+  mHost = nullptr;
+}
+
+void GMPVideoEncodedFrameImpl::ActorDestroyed() {
+  // Simply clear out Shmem reference, do not attempt to
+  // properly free it. It has already been freed.
+  mBuffer = ipc::Shmem();
+  // No more host.
+  mHost = nullptr;
+}
+
+bool GMPVideoEncodedFrameImpl::RelinquishFrameData(
+    GMPVideoEncodedFrameData& aFrameData) {
+  aFrameData.mEncodedWidth() = mEncodedWidth;
+  aFrameData.mEncodedHeight() = mEncodedHeight;
+  aFrameData.mTimestamp() = mTimeStamp;
+  aFrameData.mDuration() = mDuration;
+  aFrameData.mFrameType() = mFrameType;
+  aFrameData.mSize() = mSize;
+  aFrameData.mCompleteFrame() = mCompleteFrame;
+  aFrameData.mBuffer() = mBuffer;
+  aFrameData.mBufferType() = mBufferType;
+
+  // This method is called right before Shmem is sent to another process.
+  // We need to effectively zero out our member copy so that we don't
+  // try to delete Shmem we don't own later.
+  mBuffer = ipc::Shmem();
+
+  return true;
+}
+
+void GMPVideoEncodedFrameImpl::DestroyBuffer() {
+  if (mHost && mBuffer.IsWritable()) {
+    mHost->SharedMemMgr()->MgrDeallocShmem(GMPSharedMem::kGMPEncodedData,
+                                           mBuffer);
+  }
+  mBuffer = ipc::Shmem();
+}
+
+GMPErr GMPVideoEncodedFrameImpl::CreateEmptyFrame(uint32_t aSize) {
+  if (aSize == 0) {
+    DestroyBuffer();
+  } else if (aSize > AllocatedSize()) {
+    DestroyBuffer();
+    if (!mHost->SharedMemMgr()->MgrAllocShmem(GMPSharedMem::kGMPEncodedData,
+                                              aSize, &mBuffer) ||
+        !Buffer()) {
+      return GMPAllocErr;
+    }
+  }
+  mSize = aSize;
+
+  return GMPNoErr;
+}
+
+GMPErr GMPVideoEncodedFrameImpl::CopyFrame(const GMPVideoEncodedFrame& aFrame) {
+  auto& f = static_cast<const GMPVideoEncodedFrameImpl&>(aFrame);
+
+  if (f.mSize != 0) {
+    GMPErr err = CreateEmptyFrame(f.mSize);
+    if (err != GMPNoErr) {
+      return err;
+    }
+    memcpy(Buffer(), f.Buffer(), f.mSize);
+  }
+  mEncodedWidth = f.mEncodedWidth;
+  mEncodedHeight = f.mEncodedHeight;
+  mTimeStamp = f.mTimeStamp;
+  mDuration = f.mDuration;
+  mFrameType = f.mFrameType;
+  mSize = f.mSize;  // already set...
+  mCompleteFrame = f.mCompleteFrame;
+  mBufferType = f.mBufferType;
+  // Don't copy host, that should have been set properly on object creation via
+  // host.
+
+  return GMPNoErr;
+}
+
+void GMPVideoEncodedFrameImpl::SetEncodedWidth(uint32_t aEncodedWidth) {
+  mEncodedWidth = aEncodedWidth;
+}
+
+uint32_t GMPVideoEncodedFrameImpl::EncodedWidth() { return mEncodedWidth; }
+
+void GMPVideoEncodedFrameImpl::SetEncodedHeight(uint32_t aEncodedHeight) {
+  mEncodedHeight = aEncodedHeight;
+}
+
+uint32_t GMPVideoEncodedFrameImpl::EncodedHeight() { return mEncodedHeight; }
+
+void GMPVideoEncodedFrameImpl::SetTimeStamp(uint64_t aTimeStamp) {
+  mTimeStamp = aTimeStamp;
+}
+
+uint64_t GMPVideoEncodedFrameImpl::TimeStamp() { return mTimeStamp; }
+
+void GMPVideoEncodedFrameImpl::SetDuration(uint64_t aDuration) {
+  mDuration = aDuration;
+}
+
+uint64_t GMPVideoEncodedFrameImpl::Duration() const { return mDuration; }
+
+void GMPVideoEncodedFrameImpl::SetFrameType(GMPVideoFrameType aFrameType) {
+  mFrameType = aFrameType;
+}
+
+GMPVideoFrameType GMPVideoEncodedFrameImpl::FrameType() { return mFrameType; }
+
+void GMPVideoEncodedFrameImpl::SetAllocatedSize(uint32_t aNewSize) {
+  if (aNewSize <= AllocatedSize()) {
+    return;
+  }
+
+  if (!mHost) {
+    return;
+  }
+
+  ipc::Shmem new_mem;
+  if (!mHost->SharedMemMgr()->MgrAllocShmem(GMPSharedMem::kGMPEncodedData,
+                                            aNewSize, &new_mem) ||
+      !new_mem.get<uint8_t>()) {
+    return;
+  }
+
+  if (mBuffer.IsReadable()) {
+    memcpy(new_mem.get<uint8_t>(), Buffer(), mSize);
+  }
+
+  DestroyBuffer();
+
+  mBuffer = new_mem;
+}
+
+uint32_t GMPVideoEncodedFrameImpl::AllocatedSize() {
+  if (mBuffer.IsWritable()) {
+    return mBuffer.Size<uint8_t>();
+  }
+  return 0;
+}
+
+void GMPVideoEncodedFrameImpl::SetSize(uint32_t aSize) { mSize = aSize; }
+
+uint32_t GMPVideoEncodedFrameImpl::Size() { return mSize; }
+
+void GMPVideoEncodedFrameImpl::SetCompleteFrame(bool aCompleteFrame) {
+  mCompleteFrame = aCompleteFrame;
+}
+
+bool GMPVideoEncodedFrameImpl::CompleteFrame() { return mCompleteFrame; }
+
+const uint8_t* GMPVideoEncodedFrameImpl::Buffer() const {
+  return mBuffer.get<uint8_t>();
+}
+
+uint8_t* GMPVideoEncodedFrameImpl::Buffer() { return mBuffer.get<uint8_t>(); }
+
+void GMPVideoEncodedFrameImpl::Destroy() { delete this; }
+
+GMPBufferType GMPVideoEncodedFrameImpl::BufferType() const {
+  return mBufferType;
+}
+
+void GMPVideoEncodedFrameImpl::SetBufferType(GMPBufferType aBufferType) {
+  mBufferType = aBufferType;
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPVideoEncodedFrameImpl.h b/dom/media/gmp/GMPVideoEncodedFrameImpl.h
new file mode 100644
index 0000000000..fbb5f92146
--- /dev/null
+++ b/dom/media/gmp/GMPVideoEncodedFrameImpl.h
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2014, Mozilla Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials provided
+ *    with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMPVideoEncodedFrameImpl_h_
+#define GMPVideoEncodedFrameImpl_h_
+
+#include "gmp-errors.h"
+#include "gmp-video-frame.h"
+#include "gmp-video-frame-encoded.h"
+#include "mozilla/ipc/Shmem.h"
+
+namespace mozilla {
+class CryptoSample;
+
+namespace gmp {
+
+class GMPVideoHostImpl;
+class GMPVideoEncodedFrameData;
+
+class GMPVideoEncodedFrameImpl : public GMPVideoEncodedFrame {
+  friend struct IPC::ParamTraits<mozilla::gmp::GMPVideoEncodedFrameImpl>;
+
+ public:
+  explicit GMPVideoEncodedFrameImpl(GMPVideoHostImpl* aHost);
+  GMPVideoEncodedFrameImpl(const GMPVideoEncodedFrameData& aFrameData,
+                           GMPVideoHostImpl* aHost);
+  virtual ~GMPVideoEncodedFrameImpl();
+
+  // This is called during a normal destroy sequence, which is
+  // when a consumer is finished or during XPCOM shutdown.
+  void DoneWithAPI();
+  // Does not attempt to release Shmem, as the Shmem has already been released.
+  void ActorDestroyed();
+
+  bool RelinquishFrameData(GMPVideoEncodedFrameData& aFrameData);
+
+  // GMPVideoFrame
+  GMPVideoFrameFormat GetFrameFormat() override;
+  void Destroy() override;
+
+  // GMPVideoEncodedFrame
+  GMPErr CreateEmptyFrame(uint32_t aSize) override;
+  GMPErr CopyFrame(const GMPVideoEncodedFrame& aFrame) override;
+  void SetEncodedWidth(uint32_t aEncodedWidth) override;
+  uint32_t EncodedWidth() override;
+  void SetEncodedHeight(uint32_t aEncodedHeight) override;
+  uint32_t EncodedHeight() override;
+  // Microseconds
+  void SetTimeStamp(uint64_t aTimeStamp) override;
+  uint64_t TimeStamp() override;
+  // Set frame duration (microseconds)
+  // NOTE: next-frame's Timestamp() != this-frame's TimeStamp()+Duration()
+  // depending on rounding to avoid having to track roundoff errors
+  // and dropped/missing frames(!) (which may leave a large gap)
+  void SetDuration(uint64_t aDuration) override;
+  uint64_t Duration() const override;
+  void SetFrameType(GMPVideoFrameType aFrameType) override;
+  GMPVideoFrameType FrameType() override;
+  void SetAllocatedSize(uint32_t aNewSize) override;
+  uint32_t AllocatedSize() override;
+  void SetSize(uint32_t aSize) override;
+  uint32_t Size() override;
+  void SetCompleteFrame(bool aCompleteFrame) override;
+  bool CompleteFrame() override;
+  const uint8_t* Buffer() const override;
+  uint8_t* Buffer() override;
+  GMPBufferType BufferType() const override;
+  void SetBufferType(GMPBufferType aBufferType) override;
+
+ private:
+  void DestroyBuffer();
+
+  uint32_t mEncodedWidth;
+  uint32_t mEncodedHeight;
+  uint64_t mTimeStamp;
+  uint64_t mDuration;
+  GMPVideoFrameType mFrameType;
+  uint32_t mSize;
+  bool mCompleteFrame;
+  GMPVideoHostImpl* mHost;
+  ipc::Shmem mBuffer;
+  GMPBufferType mBufferType;
+};
+
+}  // namespace gmp
+
+}  // namespace mozilla
+
+#endif  // GMPVideoEncodedFrameImpl_h_
diff --git a/dom/media/gmp/GMPVideoEncoderChild.cpp b/dom/media/gmp/GMPVideoEncoderChild.cpp
new file mode 100644
index 0000000000..19a96b5efe
--- /dev/null
+++ b/dom/media/gmp/GMPVideoEncoderChild.cpp
@@ -0,0 +1,203 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPVideoEncoderChild.h"
+#include "GMPContentChild.h"
+#include <stdio.h>
+#include "mozilla/Unused.h"
+#include "GMPVideoEncodedFrameImpl.h"
+#include "GMPVideoi420FrameImpl.h"
+#include "runnable_utils.h"
+
+namespace mozilla::gmp {
+
+GMPVideoEncoderChild::GMPVideoEncoderChild(GMPContentChild* aPlugin)
+    : GMPSharedMemManager(aPlugin),
+      mPlugin(aPlugin),
+      mVideoEncoder(nullptr),
+      mVideoHost(this),
+      mNeedShmemIntrCount(0),
+      mPendingEncodeComplete(false) {
+  MOZ_ASSERT(mPlugin);
+}
+
+GMPVideoEncoderChild::~GMPVideoEncoderChild() {
+  MOZ_ASSERT(!mNeedShmemIntrCount);
+}
+
+void GMPVideoEncoderChild::Init(GMPVideoEncoder* aEncoder) {
+  MOZ_ASSERT(aEncoder,
+             "Cannot initialize video encoder child without a video encoder!");
+  mVideoEncoder = aEncoder;
+}
+
+GMPVideoHostImpl& GMPVideoEncoderChild::Host() { return mVideoHost; }
+
+void GMPVideoEncoderChild::Encoded(GMPVideoEncodedFrame* aEncodedFrame,
+                                   const uint8_t* aCodecSpecificInfo,
+                                   uint32_t aCodecSpecificInfoLength) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  auto ef = static_cast<GMPVideoEncodedFrameImpl*>(aEncodedFrame);
+
+  GMPVideoEncodedFrameData frameData;
+  ef->RelinquishFrameData(frameData);
+
+  nsTArray<uint8_t> codecSpecific;
+  codecSpecific.AppendElements(aCodecSpecificInfo, aCodecSpecificInfoLength);
+  SendEncoded(frameData, codecSpecific);
+
+  aEncodedFrame->Destroy();
+}
+
+void GMPVideoEncoderChild::Error(GMPErr aError) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  SendError(aError);
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderChild::RecvInitEncode(
+    const GMPVideoCodec& aCodecSettings, nsTArray<uint8_t>&& aCodecSpecific,
+    const int32_t& aNumberOfCores, const uint32_t& aMaxPayloadSize) {
+  if (!mVideoEncoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoEncoder->InitEncode(aCodecSettings, aCodecSpecific.Elements(),
+                            aCodecSpecific.Length(), this, aNumberOfCores,
+                            aMaxPayloadSize);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderChild::RecvEncode(
+    const GMPVideoi420FrameData& aInputFrame,
+    nsTArray<uint8_t>&& aCodecSpecificInfo,
+    nsTArray<GMPVideoFrameType>&& aFrameTypes) {
+  if (!mVideoEncoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  auto f = new GMPVideoi420FrameImpl(aInputFrame, &mVideoHost);
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoEncoder->Encode(f, aCodecSpecificInfo.Elements(),
+                        aCodecSpecificInfo.Length(), aFrameTypes.Elements(),
+                        aFrameTypes.Length());
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderChild::RecvChildShmemForPool(
+    Shmem&& aEncodedBuffer) {
+  if (aEncodedBuffer.IsWritable()) {
+    mVideoHost.SharedMemMgr()->MgrDeallocShmem(GMPSharedMem::kGMPEncodedData,
+                                               aEncodedBuffer);
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderChild::RecvSetChannelParameters(
+    const uint32_t& aPacketLoss, const uint32_t& aRTT) {
+  if (!mVideoEncoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoEncoder->SetChannelParameters(aPacketLoss, aRTT);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderChild::RecvSetRates(
+    const uint32_t& aNewBitRate, const uint32_t& aFrameRate) {
+  if (!mVideoEncoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoEncoder->SetRates(aNewBitRate, aFrameRate);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderChild::RecvSetPeriodicKeyFrames(
+    const bool& aEnable) {
+  if (!mVideoEncoder) {
+    return IPC_FAIL(this, "!mVideoDecoder");
+  }
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoEncoder->SetPeriodicKeyFrames(aEnable);
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderChild::RecvEncodingComplete() {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  if (mNeedShmemIntrCount) {
+    // There's a GMP blocked in Alloc() waiting for the CallNeedShem() to
+    // return a frame they can use. Don't call the GMP's EncodingComplete()
+    // now and don't delete the GMPVideoEncoderChild, defer processing the
+    // EncodingComplete() until once the Alloc() finishes.
+    mPendingEncodeComplete = true;
+    return IPC_OK();
+  }
+
+  if (!mVideoEncoder) {
+    // There is not much to clean up anymore.
+    Unused << Send__delete__(this);
+    return IPC_OK();
+  }
+
+  // Ignore any return code. It is OK for this to fail without killing the
+  // process.
+  mVideoEncoder->EncodingComplete();
+
+  mVideoHost.DoneWithAPI();
+
+  mPlugin = nullptr;
+
+  Unused << Send__delete__(this);
+
+  return IPC_OK();
+}
+
+bool GMPVideoEncoderChild::Alloc(size_t aSize, Shmem* aMem) {
+  MOZ_ASSERT(mPlugin->GMPMessageLoop() == MessageLoop::current());
+
+  bool rv;
+#ifndef SHMEM_ALLOC_IN_CHILD
+  ++mNeedShmemIntrCount;
+  rv = SendNeedShmem(aSize, aMem);
+  --mNeedShmemIntrCount;
+  if (mPendingEncodeComplete && mNeedShmemIntrCount == 0) {
+    mPendingEncodeComplete = false;
+    mPlugin->GMPMessageLoop()->PostTask(
+        NewRunnableMethod("gmp::GMPVideoEncoderChild::RecvEncodingComplete",
+                          this, &GMPVideoEncoderChild::RecvEncodingComplete));
+  }
+#else
+  rv = AllocShmem(aSize, aMem);
+#endif
+  return rv;
+}
+
+void GMPVideoEncoderChild::Dealloc(Shmem&& aMem) {
+#ifndef SHMEM_ALLOC_IN_CHILD
+  SendParentShmemForPool(std::move(aMem));
+#else
+  DeallocShmem(aMem);
+#endif
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPVideoEncoderChild.h b/dom/media/gmp/GMPVideoEncoderChild.h
new file mode 100644
index 0000000000..dd3c0fdf37
--- /dev/null
+++ b/dom/media/gmp/GMPVideoEncoderChild.h
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoEncoderChild_h_
+#define GMPVideoEncoderChild_h_
+
+#include "nsString.h"
+#include "mozilla/gmp/PGMPVideoEncoderChild.h"
+#include "gmp-video-encode.h"
+#include "GMPSharedMemManager.h"
+#include "GMPVideoHost.h"
+
+namespace mozilla::gmp {
+
+class GMPContentChild;
+
+class GMPVideoEncoderChild : public PGMPVideoEncoderChild,
+                             public GMPVideoEncoderCallback,
+                             public GMPSharedMemManager {
+  friend class PGMPVideoEncoderChild;
+
+ public:
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PGMPVideoEncoderChild.
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPVideoEncoderChild, final);
+
+  explicit GMPVideoEncoderChild(GMPContentChild* aPlugin);
+
+  void Init(GMPVideoEncoder* aEncoder);
+  GMPVideoHostImpl& Host();
+
+  // GMPVideoEncoderCallback
+  void Encoded(GMPVideoEncodedFrame* aEncodedFrame,
+               const uint8_t* aCodecSpecificInfo,
+               uint32_t aCodecSpecificInfoLength) override;
+  void Error(GMPErr aError) override;
+
+  // GMPSharedMemManager
+  bool Alloc(size_t aSize, Shmem* aMem) override;
+  void Dealloc(Shmem&& aMem) override;
+
+ private:
+  virtual ~GMPVideoEncoderChild();
+
+  // PGMPVideoEncoderChild
+  mozilla::ipc::IPCResult RecvInitEncode(const GMPVideoCodec& aCodecSettings,
+                                         nsTArray<uint8_t>&& aCodecSpecific,
+                                         const int32_t& aNumberOfCores,
+                                         const uint32_t& aMaxPayloadSize);
+  mozilla::ipc::IPCResult RecvEncode(const GMPVideoi420FrameData& aInputFrame,
+                                     nsTArray<uint8_t>&& aCodecSpecificInfo,
+                                     nsTArray<GMPVideoFrameType>&& aFrameTypes);
+  mozilla::ipc::IPCResult RecvChildShmemForPool(Shmem&& aEncodedBuffer);
+  mozilla::ipc::IPCResult RecvSetChannelParameters(const uint32_t& aPacketLoss,
+                                                   const uint32_t& aRTT);
+  mozilla::ipc::IPCResult RecvSetRates(const uint32_t& aNewBitRate,
+                                       const uint32_t& aFrameRate);
+  mozilla::ipc::IPCResult RecvSetPeriodicKeyFrames(const bool& aEnable);
+  mozilla::ipc::IPCResult RecvEncodingComplete();
+
+  GMPContentChild* mPlugin;
+  GMPVideoEncoder* mVideoEncoder;
+  GMPVideoHostImpl mVideoHost;
+
+  // Non-zero when a GMP is blocked spinning the IPC message loop while
+  // waiting on an NeedShmem to complete.
+  int mNeedShmemIntrCount;
+  bool mPendingEncodeComplete;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPVideoEncoderChild_h_
diff --git a/dom/media/gmp/GMPVideoEncoderParent.cpp b/dom/media/gmp/GMPVideoEncoderParent.cpp
new file mode 100644
index 0000000000..21c86ff9ab
--- /dev/null
+++ b/dom/media/gmp/GMPVideoEncoderParent.cpp
@@ -0,0 +1,307 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPVideoEncoderParent.h"
+
+#include "GMPContentParent.h"
+#include "GMPCrashHelper.h"
+#include "GMPLog.h"
+#include "GMPMessageUtils.h"
+#include "GMPVideoEncodedFrameImpl.h"
+#include "GMPVideoi420FrameImpl.h"
+#include "mozilla/gmp/GMPTypes.h"
+#include "mozilla/Unused.h"
+#include "nsAutoRef.h"
+#include "nsThread.h"
+#include "nsThreadUtils.h"
+#include "runnable_utils.h"
+
+namespace mozilla::gmp {
+
+#ifdef __CLASS__
+#  undef __CLASS__
+#endif
+#define __CLASS__ "GMPVideoEncoderParent"
+
+// States:
+// Initial: mIsOpen == false
+//    on InitDecode success -> Open
+//    on Shutdown -> Dead
+// Open: mIsOpen == true
+//    on Close -> Dead
+//    on ActorDestroy -> Dead
+//    on Shutdown -> Dead
+// Dead: mIsOpen == false
+
+GMPVideoEncoderParent::GMPVideoEncoderParent(GMPContentParent* aPlugin)
+    : GMPSharedMemManager(aPlugin),
+      mIsOpen(false),
+      mShuttingDown(false),
+      mActorDestroyed(false),
+      mPlugin(aPlugin),
+      mCallback(nullptr),
+      mVideoHost(this),
+      mPluginId(aPlugin->GetPluginId()) {
+  MOZ_ASSERT(mPlugin);
+}
+
+GMPVideoHostImpl& GMPVideoEncoderParent::Host() { return mVideoHost; }
+
+// Note: may be called via Terminated()
+void GMPVideoEncoderParent::Close() {
+  GMP_LOG_DEBUG("%s::%s: %p", __CLASS__, __FUNCTION__, this);
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+  // Consumer is done with us; we can shut down.  No more callbacks should
+  // be made to mCallback.  Note: do this before Shutdown()!
+  mCallback = nullptr;
+
+  // Let Shutdown mark us as dead so it knows if we had been alive
+
+  // In case this is the last reference
+  RefPtr<GMPVideoEncoderParent> kungfudeathgrip(this);
+  Release();
+  Shutdown();
+}
+
+GMPErr GMPVideoEncoderParent::InitEncode(
+    const GMPVideoCodec& aCodecSettings,
+    const nsTArray<uint8_t>& aCodecSpecific,
+    GMPVideoEncoderCallbackProxy* aCallback, int32_t aNumberOfCores,
+    uint32_t aMaxPayloadSize) {
+  GMP_LOG_DEBUG("%s::%s: %p", __CLASS__, __FUNCTION__, this);
+  if (mIsOpen) {
+    NS_WARNING("Trying to re-init an in-use GMP video encoder!");
+    return GMPGenericErr;
+    ;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+  MOZ_ASSERT(!mCallback);
+
+  if (!aCallback) {
+    return GMPGenericErr;
+  }
+  mCallback = aCallback;
+
+  if (!SendInitEncode(aCodecSettings, aCodecSpecific, aNumberOfCores,
+                      aMaxPayloadSize)) {
+    return GMPGenericErr;
+  }
+  mIsOpen = true;
+
+  // Async IPC, we don't have access to a return value.
+  return GMPNoErr;
+}
+
+GMPErr GMPVideoEncoderParent::Encode(
+    GMPUniquePtr<GMPVideoi420Frame> aInputFrame,
+    const nsTArray<uint8_t>& aCodecSpecificInfo,
+    const nsTArray<GMPVideoFrameType>& aFrameTypes) {
+  if (!mIsOpen) {
+    NS_WARNING("Trying to use an dead GMP video encoder");
+    return GMPGenericErr;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  GMPUniquePtr<GMPVideoi420FrameImpl> inputFrameImpl(
+      static_cast<GMPVideoi420FrameImpl*>(aInputFrame.release()));
+
+  // Very rough kill-switch if the plugin stops processing.  If it's merely
+  // hung and continues, we'll come back to life eventually.
+  // 3* is because we're using 3 buffers per frame for i420 data for now.
+  if ((NumInUse(GMPSharedMem::kGMPFrameData) >
+       3 * GMPSharedMem::kGMPBufLimit) ||
+      (NumInUse(GMPSharedMem::kGMPEncodedData) > GMPSharedMem::kGMPBufLimit)) {
+    GMP_LOG_ERROR(
+        "%s::%s: Out of mem buffers. Frame Buffers:%lu Max:%lu, Encoded "
+        "Buffers: %lu Max: %lu",
+        __CLASS__, __FUNCTION__,
+        static_cast<unsigned long>(NumInUse(GMPSharedMem::kGMPFrameData)),
+        static_cast<unsigned long>(3 * GMPSharedMem::kGMPBufLimit),
+        static_cast<unsigned long>(NumInUse(GMPSharedMem::kGMPEncodedData)),
+        static_cast<unsigned long>(GMPSharedMem::kGMPBufLimit));
+    return GMPGenericErr;
+  }
+
+  GMPVideoi420FrameData frameData;
+  inputFrameImpl->InitFrameData(frameData);
+
+  if (!SendEncode(frameData, aCodecSpecificInfo, aFrameTypes)) {
+    GMP_LOG_ERROR("%s::%s: failed to send encode", __CLASS__, __FUNCTION__);
+    return GMPGenericErr;
+  }
+
+  // Async IPC, we don't have access to a return value.
+  return GMPNoErr;
+}
+
+GMPErr GMPVideoEncoderParent::SetChannelParameters(uint32_t aPacketLoss,
+                                                   uint32_t aRTT) {
+  if (!mIsOpen) {
+    NS_WARNING("Trying to use an invalid GMP video encoder!");
+    return GMPGenericErr;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  if (!SendSetChannelParameters(aPacketLoss, aRTT)) {
+    return GMPGenericErr;
+  }
+
+  // Async IPC, we don't have access to a return value.
+  return GMPNoErr;
+}
+
+GMPErr GMPVideoEncoderParent::SetRates(uint32_t aNewBitRate,
+                                       uint32_t aFrameRate) {
+  if (!mIsOpen) {
+    NS_WARNING("Trying to use an dead GMP video decoder");
+    return GMPGenericErr;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  if (!SendSetRates(aNewBitRate, aFrameRate)) {
+    return GMPGenericErr;
+  }
+
+  // Async IPC, we don't have access to a return value.
+  return GMPNoErr;
+}
+
+GMPErr GMPVideoEncoderParent::SetPeriodicKeyFrames(bool aEnable) {
+  if (!mIsOpen) {
+    NS_WARNING("Trying to use an invalid GMP video encoder!");
+    return GMPGenericErr;
+  }
+
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  if (!SendSetPeriodicKeyFrames(aEnable)) {
+    return GMPGenericErr;
+  }
+
+  // Async IPC, we don't have access to a return value.
+  return GMPNoErr;
+}
+
+// Note: Consider keeping ActorDestroy sync'd up when making changes here.
+void GMPVideoEncoderParent::Shutdown() {
+  GMP_LOG_DEBUG("%s::%s: %p", __CLASS__, __FUNCTION__, this);
+  MOZ_ASSERT(mPlugin->GMPEventTarget()->IsOnCurrentThread());
+
+  if (mShuttingDown) {
+    return;
+  }
+  mShuttingDown = true;
+
+  // Notify client we're gone!  Won't occur after Close()
+  if (mCallback) {
+    mCallback->Terminated();
+    mCallback = nullptr;
+  }
+
+  mIsOpen = false;
+  if (!mActorDestroyed) {
+    Unused << SendEncodingComplete();
+  }
+}
+
+// Note: Keep this sync'd up with Shutdown
+void GMPVideoEncoderParent::ActorDestroy(ActorDestroyReason aWhy) {
+  GMP_LOG_DEBUG("%s::%s: %p (%d)", __CLASS__, __FUNCTION__, this, (int)aWhy);
+  mIsOpen = false;
+  mActorDestroyed = true;
+  if (mCallback) {
+    // May call Close() (and Shutdown()) immediately or with a delay
+    mCallback->Terminated();
+    mCallback = nullptr;
+  }
+  if (mPlugin) {
+    // Ignore any return code. It is OK for this to fail without killing the
+    // process.
+    mPlugin->VideoEncoderDestroyed(this);
+    mPlugin = nullptr;
+  }
+  mVideoHost.ActorDestroyed();  // same as DoneWithAPI
+  MaybeDisconnect(aWhy == AbnormalShutdown);
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderParent::RecvEncoded(
+    const GMPVideoEncodedFrameData& aEncodedFrame,
+    nsTArray<uint8_t>&& aCodecSpecificInfo) {
+  if (mCallback) {
+    auto f = new GMPVideoEncodedFrameImpl(aEncodedFrame, &mVideoHost);
+    mCallback->Encoded(f, aCodecSpecificInfo);
+    f->Destroy();
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderParent::RecvError(const GMPErr& aError) {
+  if (mCallback) {
+    mCallback->Error(aError);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderParent::RecvShutdown() {
+  Shutdown();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderParent::RecvParentShmemForPool(
+    Shmem&& aFrameBuffer) {
+  if (aFrameBuffer.IsWritable()) {
+    // This test may be paranoia now that we don't shut down the VideoHost
+    // in ::Shutdown, but doesn't hurt
+    if (mVideoHost.SharedMemMgr()) {
+      mVideoHost.SharedMemMgr()->MgrDeallocShmem(GMPSharedMem::kGMPFrameData,
+                                                 aFrameBuffer);
+    } else {
+      GMP_LOG_DEBUG(
+          "%s::%s: %p Called in shutdown, ignoring and freeing directly",
+          __CLASS__, __FUNCTION__, this);
+      DeallocShmem(aFrameBuffer);
+    }
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderParent::RecvNeedShmem(
+    const uint32_t& aEncodedBufferSize, Shmem* aMem) {
+  ipc::Shmem mem;
+
+  // This test may be paranoia now that we don't shut down the VideoHost
+  // in ::Shutdown, but doesn't hurt
+  if (!mVideoHost.SharedMemMgr() ||
+      !mVideoHost.SharedMemMgr()->MgrAllocShmem(GMPSharedMem::kGMPEncodedData,
+                                                aEncodedBufferSize, &mem)) {
+    GMP_LOG_ERROR(
+        "%s::%s: Failed to get a shared mem buffer for Child! size %u",
+        __CLASS__, __FUNCTION__, aEncodedBufferSize);
+    return IPC_FAIL(this, "Failed to get a shared mem buffer for Child!");
+  }
+  *aMem = mem;
+  mem = ipc::Shmem();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GMPVideoEncoderParent::Recv__delete__() {
+  if (mPlugin) {
+    // Ignore any return code. It is OK for this to fail without killing the
+    // process.
+    mPlugin->VideoEncoderDestroyed(this);
+    mPlugin = nullptr;
+  }
+
+  return IPC_OK();
+}
+
+}  // namespace mozilla::gmp
+
+#undef __CLASS__
diff --git a/dom/media/gmp/GMPVideoEncoderParent.h b/dom/media/gmp/GMPVideoEncoderParent.h
new file mode 100644
index 0000000000..9e2061ae28
--- /dev/null
+++ b/dom/media/gmp/GMPVideoEncoderParent.h
@@ -0,0 +1,85 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoEncoderParent_h_
+#define GMPVideoEncoderParent_h_
+
+#include "mozilla/RefPtr.h"
+#include "gmp-video-encode.h"
+#include "mozilla/gmp/PGMPVideoEncoderParent.h"
+#include "GMPMessageUtils.h"
+#include "GMPSharedMemManager.h"
+#include "GMPUtils.h"
+#include "GMPVideoHost.h"
+#include "GMPVideoEncoderProxy.h"
+#include "GMPCrashHelperHolder.h"
+
+namespace mozilla::gmp {
+
+class GMPContentParent;
+
+class GMPVideoEncoderParent : public GMPVideoEncoderProxy,
+                              public PGMPVideoEncoderParent,
+                              public GMPSharedMemManager,
+                              public GMPCrashHelperHolder {
+  friend class PGMPVideoEncoderParent;
+
+ public:
+  // Mark AddRef and Release as `final`, as they overload pure virtual
+  // implementations in PGMPVideoEncoderParent.
+  NS_INLINE_DECL_REFCOUNTING(GMPVideoEncoderParent, final)
+
+  explicit GMPVideoEncoderParent(GMPContentParent* aPlugin);
+
+  GMPVideoHostImpl& Host();
+  void Shutdown();
+
+  // GMPVideoEncoderProxy
+  void Close() override;
+  GMPErr InitEncode(const GMPVideoCodec& aCodecSettings,
+                    const nsTArray<uint8_t>& aCodecSpecific,
+                    GMPVideoEncoderCallbackProxy* aCallback,
+                    int32_t aNumberOfCores, uint32_t aMaxPayloadSize) override;
+  GMPErr Encode(GMPUniquePtr<GMPVideoi420Frame> aInputFrame,
+                const nsTArray<uint8_t>& aCodecSpecificInfo,
+                const nsTArray<GMPVideoFrameType>& aFrameTypes) override;
+  GMPErr SetChannelParameters(uint32_t aPacketLoss, uint32_t aRTT) override;
+  GMPErr SetRates(uint32_t aNewBitRate, uint32_t aFrameRate) override;
+  GMPErr SetPeriodicKeyFrames(bool aEnable) override;
+  uint32_t GetPluginId() const override { return mPluginId; }
+
+  // GMPSharedMemManager
+  bool Alloc(size_t aSize, Shmem* aMem) override {
+    return AllocShmem(aSize, aMem);
+  }
+  void Dealloc(Shmem&& aMem) override { DeallocShmem(aMem); }
+
+ private:
+  virtual ~GMPVideoEncoderParent() = default;
+
+  // PGMPVideoEncoderParent
+  void ActorDestroy(ActorDestroyReason aWhy) override;
+  mozilla::ipc::IPCResult RecvEncoded(
+      const GMPVideoEncodedFrameData& aEncodedFrame,
+      nsTArray<uint8_t>&& aCodecSpecificInfo) override;
+  mozilla::ipc::IPCResult RecvError(const GMPErr& aError) override;
+  mozilla::ipc::IPCResult RecvShutdown() override;
+  mozilla::ipc::IPCResult RecvParentShmemForPool(Shmem&& aFrameBuffer) override;
+  mozilla::ipc::IPCResult RecvNeedShmem(const uint32_t& aEncodedBufferSize,
+                                        Shmem* aMem) override;
+  mozilla::ipc::IPCResult Recv__delete__() override;
+
+  bool mIsOpen;
+  bool mShuttingDown;
+  bool mActorDestroyed;
+  RefPtr<GMPContentParent> mPlugin;
+  GMPVideoEncoderCallbackProxy* mCallback;
+  GMPVideoHostImpl mVideoHost;
+  const uint32_t mPluginId;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPVideoEncoderParent_h_
diff --git a/dom/media/gmp/GMPVideoEncoderProxy.h b/dom/media/gmp/GMPVideoEncoderProxy.h
new file mode 100644
index 0000000000..ad638ebb3a
--- /dev/null
+++ b/dom/media/gmp/GMPVideoEncoderProxy.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoEncoderProxy_h_
+#define GMPVideoEncoderProxy_h_
+
+#include "nsTArray.h"
+#include "gmp-video-encode.h"
+#include "gmp-video-frame-i420.h"
+#include "gmp-video-frame-encoded.h"
+
+#include "GMPCallbackBase.h"
+#include "GMPUtils.h"
+
+class GMPVideoEncoderCallbackProxy : public GMPCallbackBase {
+ public:
+  virtual ~GMPVideoEncoderCallbackProxy() = default;
+  virtual void Encoded(GMPVideoEncodedFrame* aEncodedFrame,
+                       const nsTArray<uint8_t>& aCodecSpecificInfo) = 0;
+  virtual void Error(GMPErr aError) = 0;
+};
+
+// A proxy to GMPVideoEncoder in the child process.
+// GMPVideoEncoderParent exposes this to users the GMP.
+// This enables Gecko to pass nsTArrays to the child GMP and avoid
+// an extra copy when doing so.
+
+// The consumer must call Close() when done with the codec, or when
+// Terminated() is called by the GMP plugin indicating an abnormal shutdown
+// of the underlying plugin.  After calling Close(), the consumer must
+// not access this again.
+
+// This interface is not thread-safe and must only be used from GMPThread.
+class GMPVideoEncoderProxy {
+ public:
+  virtual GMPErr InitEncode(const GMPVideoCodec& aCodecSettings,
+                            const nsTArray<uint8_t>& aCodecSpecific,
+                            GMPVideoEncoderCallbackProxy* aCallback,
+                            int32_t aNumberOfCores,
+                            uint32_t aMaxPayloadSize) = 0;
+  virtual GMPErr Encode(mozilla::GMPUniquePtr<GMPVideoi420Frame> aInputFrame,
+                        const nsTArray<uint8_t>& aCodecSpecificInfo,
+                        const nsTArray<GMPVideoFrameType>& aFrameTypes) = 0;
+  virtual GMPErr SetChannelParameters(uint32_t aPacketLoss, uint32_t aRTT) = 0;
+  virtual GMPErr SetRates(uint32_t aNewBitRate, uint32_t aFrameRate) = 0;
+  virtual GMPErr SetPeriodicKeyFrames(bool aEnable) = 0;
+  virtual uint32_t GetPluginId() const = 0;
+
+  // Call to tell GMP/plugin the consumer will no longer use this
+  // interface/codec.
+  virtual void Close() = 0;
+};
+
+#endif  // GMPVideoEncoderProxy_h_
diff --git a/dom/media/gmp/GMPVideoHost.cpp b/dom/media/gmp/GMPVideoHost.cpp
new file mode 100644
index 0000000000..7ed6c5abc2
--- /dev/null
+++ b/dom/media/gmp/GMPVideoHost.cpp
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPVideoHost.h"
+#include "mozilla/Assertions.h"
+#include "GMPVideoi420FrameImpl.h"
+#include "GMPVideoEncodedFrameImpl.h"
+
+namespace mozilla::gmp {
+
+GMPVideoHostImpl::GMPVideoHostImpl(GMPSharedMemManager* aSharedMemMgr)
+    : mSharedMemMgr(aSharedMemMgr) {}
+
+GMPVideoHostImpl::~GMPVideoHostImpl() = default;
+
+GMPErr GMPVideoHostImpl::CreateFrame(GMPVideoFrameFormat aFormat,
+                                     GMPVideoFrame** aFrame) {
+  if (!mSharedMemMgr) {
+    return GMPGenericErr;
+  }
+
+  if (!aFrame) {
+    return GMPGenericErr;
+  }
+  *aFrame = nullptr;
+
+  switch (aFormat) {
+    case kGMPI420VideoFrame:
+      *aFrame = new GMPVideoi420FrameImpl(this);
+      return GMPNoErr;
+    case kGMPEncodedVideoFrame:
+      *aFrame = new GMPVideoEncodedFrameImpl(this);
+      return GMPNoErr;
+    default:
+      MOZ_ASSERT_UNREACHABLE("Unknown frame format!");
+  }
+
+  return GMPGenericErr;
+}
+
+GMPErr GMPVideoHostImpl::CreatePlane(GMPPlane** aPlane) {
+  if (!mSharedMemMgr) {
+    return GMPGenericErr;
+  }
+
+  if (!aPlane) {
+    return GMPGenericErr;
+  }
+  *aPlane = nullptr;
+
+  auto p = new GMPPlaneImpl(this);
+
+  *aPlane = p;
+
+  return GMPNoErr;
+}
+
+GMPSharedMemManager* GMPVideoHostImpl::SharedMemMgr() { return mSharedMemMgr; }
+
+// XXX This should merge with ActorDestroyed
+void GMPVideoHostImpl::DoneWithAPI() { ActorDestroyed(); }
+
+void GMPVideoHostImpl::ActorDestroyed() {
+  for (uint32_t i = mPlanes.Length(); i > 0; i--) {
+    mPlanes[i - 1]->DoneWithAPI();
+    mPlanes.RemoveElementAt(i - 1);
+  }
+  for (uint32_t i = mEncodedFrames.Length(); i > 0; i--) {
+    mEncodedFrames[i - 1]->DoneWithAPI();
+    mEncodedFrames.RemoveElementAt(i - 1);
+  }
+  mSharedMemMgr = nullptr;
+}
+
+void GMPVideoHostImpl::PlaneCreated(GMPPlaneImpl* aPlane) {
+  mPlanes.AppendElement(aPlane);
+}
+
+void GMPVideoHostImpl::PlaneDestroyed(GMPPlaneImpl* aPlane) {
+  MOZ_ALWAYS_TRUE(mPlanes.RemoveElement(aPlane));
+}
+
+void GMPVideoHostImpl::EncodedFrameCreated(
+    GMPVideoEncodedFrameImpl* aEncodedFrame) {
+  mEncodedFrames.AppendElement(aEncodedFrame);
+}
+
+void GMPVideoHostImpl::EncodedFrameDestroyed(GMPVideoEncodedFrameImpl* aFrame) {
+  MOZ_ALWAYS_TRUE(mEncodedFrames.RemoveElement(aFrame));
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPVideoHost.h b/dom/media/gmp/GMPVideoHost.h
new file mode 100644
index 0000000000..8b75ff28fe
--- /dev/null
+++ b/dom/media/gmp/GMPVideoHost.h
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoHost_h_
+#define GMPVideoHost_h_
+
+#include "gmp-video-host.h"
+#include "gmp-video-plane.h"
+#include "gmp-video-frame.h"
+#include "nsTArray.h"
+
+namespace mozilla::gmp {
+
+class GMPSharedMemManager;
+class GMPPlaneImpl;
+class GMPVideoEncodedFrameImpl;
+
+class GMPVideoHostImpl : public GMPVideoHost {
+ public:
+  explicit GMPVideoHostImpl(GMPSharedMemManager* aSharedMemMgr);
+  virtual ~GMPVideoHostImpl();
+
+  // Used for shared memory allocation and deallocation.
+  GMPSharedMemManager* SharedMemMgr();
+  void DoneWithAPI();
+  void ActorDestroyed();
+  void PlaneCreated(GMPPlaneImpl* aPlane);
+  void PlaneDestroyed(GMPPlaneImpl* aPlane);
+  void EncodedFrameCreated(GMPVideoEncodedFrameImpl* aEncodedFrame);
+  void EncodedFrameDestroyed(GMPVideoEncodedFrameImpl* aFrame);
+
+  // GMPVideoHost
+  GMPErr CreateFrame(GMPVideoFrameFormat aFormat,
+                     GMPVideoFrame** aFrame) override;
+  GMPErr CreatePlane(GMPPlane** aPlane) override;
+
+ private:
+  // All shared memory allocations have to be made by an IPDL actor.
+  // This is a reference to the owning actor. If this reference is
+  // null then the actor has died and all allocations must fail.
+  GMPSharedMemManager* mSharedMemMgr;
+
+  // We track all of these things because they need to handle further
+  // allocations through us and we need to notify them when they
+  // can't use us any more.
+  nsTArray<GMPPlaneImpl*> mPlanes;
+  nsTArray<GMPVideoEncodedFrameImpl*> mEncodedFrames;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPVideoHost_h_
diff --git a/dom/media/gmp/GMPVideoPlaneImpl.cpp b/dom/media/gmp/GMPVideoPlaneImpl.cpp
new file mode 100644
index 0000000000..6c24b5b4a6
--- /dev/null
+++ b/dom/media/gmp/GMPVideoPlaneImpl.cpp
@@ -0,0 +1,179 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPVideoPlaneImpl.h"
+#include "mozilla/gmp/GMPTypes.h"
+#include "GMPVideoHost.h"
+#include "GMPSharedMemManager.h"
+
+namespace mozilla::gmp {
+
+GMPPlaneImpl::GMPPlaneImpl(GMPVideoHostImpl* aHost)
+    : mSize(0), mStride(0), mHost(aHost) {
+  MOZ_ASSERT(mHost);
+  mHost->PlaneCreated(this);
+}
+
+GMPPlaneImpl::GMPPlaneImpl(const GMPPlaneData& aPlaneData,
+                           GMPVideoHostImpl* aHost)
+    : mBuffer(aPlaneData.mBuffer()),
+      mSize(aPlaneData.mSize()),
+      mStride(aPlaneData.mStride()),
+      mHost(aHost) {
+  MOZ_ASSERT(mHost);
+  mHost->PlaneCreated(this);
+}
+
+GMPPlaneImpl::~GMPPlaneImpl() {
+  DestroyBuffer();
+  if (mHost) {
+    mHost->PlaneDestroyed(this);
+  }
+}
+
+void GMPPlaneImpl::DoneWithAPI() {
+  DestroyBuffer();
+
+  // Do this after destroying the buffer because destruction
+  // involves deallocation, which requires a host.
+  mHost = nullptr;
+}
+
+void GMPPlaneImpl::ActorDestroyed() {
+  // Simply clear out Shmem reference, do not attempt to
+  // properly free it. It has already been freed.
+  mBuffer = ipc::Shmem();
+  // No more host.
+  mHost = nullptr;
+}
+
+bool GMPPlaneImpl::InitPlaneData(GMPPlaneData& aPlaneData) {
+  aPlaneData.mBuffer() = mBuffer;
+  aPlaneData.mSize() = mSize;
+  aPlaneData.mStride() = mStride;
+
+  // This method is called right before Shmem is sent to another process.
+  // We need to effectively zero out our member copy so that we don't
+  // try to delete memory we don't own later.
+  mBuffer = ipc::Shmem();
+
+  return true;
+}
+
+GMPErr GMPPlaneImpl::MaybeResize(int32_t aNewSize) {
+  if (aNewSize <= AllocatedSize()) {
+    return GMPNoErr;
+  }
+
+  if (!mHost) {
+    return GMPGenericErr;
+  }
+
+  ipc::Shmem new_mem;
+  if (!mHost->SharedMemMgr()->MgrAllocShmem(GMPSharedMem::kGMPFrameData,
+                                            aNewSize, &new_mem) ||
+      !new_mem.get<uint8_t>()) {
+    return GMPAllocErr;
+  }
+
+  if (mBuffer.IsReadable()) {
+    memcpy(new_mem.get<uint8_t>(), Buffer(), mSize);
+  }
+
+  DestroyBuffer();
+
+  mBuffer = new_mem;
+
+  return GMPNoErr;
+}
+
+void GMPPlaneImpl::DestroyBuffer() {
+  if (mHost && mBuffer.IsWritable()) {
+    mHost->SharedMemMgr()->MgrDeallocShmem(GMPSharedMem::kGMPFrameData,
+                                           mBuffer);
+  }
+  mBuffer = ipc::Shmem();
+}
+
+GMPErr GMPPlaneImpl::CreateEmptyPlane(int32_t aAllocatedSize, int32_t aStride,
+                                      int32_t aPlaneSize) {
+  if (aAllocatedSize < 1 || aStride < 1 || aPlaneSize < 1) {
+    return GMPGenericErr;
+  }
+
+  GMPErr err = MaybeResize(aAllocatedSize);
+  if (err != GMPNoErr) {
+    return err;
+  }
+
+  mSize = aPlaneSize;
+  mStride = aStride;
+
+  return GMPNoErr;
+}
+
+GMPErr GMPPlaneImpl::Copy(const GMPPlane& aPlane) {
+  auto& planeimpl = static_cast<const GMPPlaneImpl&>(aPlane);
+
+  GMPErr err = MaybeResize(planeimpl.mSize);
+  if (err != GMPNoErr) {
+    return err;
+  }
+
+  if (planeimpl.Buffer() && planeimpl.mSize > 0) {
+    memcpy(Buffer(), planeimpl.Buffer(), mSize);
+  }
+
+  mSize = planeimpl.mSize;
+  mStride = planeimpl.mStride;
+
+  return GMPNoErr;
+}
+
+GMPErr GMPPlaneImpl::Copy(int32_t aSize, int32_t aStride,
+                          const uint8_t* aBuffer) {
+  GMPErr err = MaybeResize(aSize);
+  if (err != GMPNoErr) {
+    return err;
+  }
+
+  if (aBuffer && aSize > 0) {
+    memcpy(Buffer(), aBuffer, aSize);
+  }
+
+  mSize = aSize;
+  mStride = aStride;
+
+  return GMPNoErr;
+}
+
+void GMPPlaneImpl::Swap(GMPPlane& aPlane) {
+  auto& planeimpl = static_cast<GMPPlaneImpl&>(aPlane);
+
+  std::swap(mStride, planeimpl.mStride);
+  std::swap(mSize, planeimpl.mSize);
+  std::swap(mBuffer, planeimpl.mBuffer);
+}
+
+int32_t GMPPlaneImpl::AllocatedSize() const {
+  if (mBuffer.IsWritable()) {
+    return mBuffer.Size<uint8_t>();
+  }
+  return 0;
+}
+
+void GMPPlaneImpl::ResetSize() { mSize = 0; }
+
+bool GMPPlaneImpl::IsZeroSize() const { return (mSize == 0); }
+
+int32_t GMPPlaneImpl::Stride() const { return mStride; }
+
+const uint8_t* GMPPlaneImpl::Buffer() const { return mBuffer.get<uint8_t>(); }
+
+uint8_t* GMPPlaneImpl::Buffer() { return mBuffer.get<uint8_t>(); }
+
+void GMPPlaneImpl::Destroy() { delete this; }
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPVideoPlaneImpl.h b/dom/media/gmp/GMPVideoPlaneImpl.h
new file mode 100644
index 0000000000..d0c1de1cd3
--- /dev/null
+++ b/dom/media/gmp/GMPVideoPlaneImpl.h
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoPlaneImpl_h_
+#define GMPVideoPlaneImpl_h_
+
+#include "gmp-video-plane.h"
+#include "mozilla/ipc/Shmem.h"
+
+namespace mozilla::gmp {
+
+class GMPVideoHostImpl;
+class GMPPlaneData;
+
+class GMPPlaneImpl : public GMPPlane {
+  friend struct IPC::ParamTraits<mozilla::gmp::GMPPlaneImpl>;
+
+ public:
+  explicit GMPPlaneImpl(GMPVideoHostImpl* aHost);
+  GMPPlaneImpl(const GMPPlaneData& aPlaneData, GMPVideoHostImpl* aHost);
+  virtual ~GMPPlaneImpl();
+
+  // This is called during a normal destroy sequence, which is
+  // when a consumer is finished or during XPCOM shutdown.
+  void DoneWithAPI();
+  // This is called when something has gone wrong - specicifically,
+  // a child process has crashed. Does not attempt to release Shmem,
+  // as the Shmem has already been released.
+  void ActorDestroyed();
+
+  bool InitPlaneData(GMPPlaneData& aPlaneData);
+
+  // GMPPlane
+  GMPErr CreateEmptyPlane(int32_t aAllocatedSize, int32_t aStride,
+                          int32_t aPlaneSize) override;
+  GMPErr Copy(const GMPPlane& aPlane) override;
+  GMPErr Copy(int32_t aSize, int32_t aStride, const uint8_t* aBuffer) override;
+  void Swap(GMPPlane& aPlane) override;
+  int32_t AllocatedSize() const override;
+  void ResetSize() override;
+  bool IsZeroSize() const override;
+  int32_t Stride() const override;
+  const uint8_t* Buffer() const override;
+  uint8_t* Buffer() override;
+  void Destroy() override;
+
+ private:
+  GMPErr MaybeResize(int32_t aNewSize);
+  void DestroyBuffer();
+
+  ipc::Shmem mBuffer;
+  int32_t mSize;
+  int32_t mStride;
+  GMPVideoHostImpl* mHost;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPVideoPlaneImpl_h_
diff --git a/dom/media/gmp/GMPVideoi420FrameImpl.cpp b/dom/media/gmp/GMPVideoi420FrameImpl.cpp
new file mode 100644
index 0000000000..051838b985
--- /dev/null
+++ b/dom/media/gmp/GMPVideoi420FrameImpl.cpp
@@ -0,0 +1,315 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GMPVideoi420FrameImpl.h"
+#include "mozilla/gmp/GMPTypes.h"
+#include "mozilla/CheckedInt.h"
+
+namespace mozilla::gmp {
+
+GMPVideoi420FrameImpl::GMPVideoi420FrameImpl(GMPVideoHostImpl* aHost)
+    : mYPlane(aHost),
+      mUPlane(aHost),
+      mVPlane(aHost),
+      mWidth(0),
+      mHeight(0),
+      mTimestamp(0ll),
+      mDuration(0ll) {
+  MOZ_ASSERT(aHost);
+}
+
+GMPVideoi420FrameImpl::GMPVideoi420FrameImpl(
+    const GMPVideoi420FrameData& aFrameData, GMPVideoHostImpl* aHost)
+    : mYPlane(aFrameData.mYPlane(), aHost),
+      mUPlane(aFrameData.mUPlane(), aHost),
+      mVPlane(aFrameData.mVPlane(), aHost),
+      mWidth(aFrameData.mWidth()),
+      mHeight(aFrameData.mHeight()),
+      mTimestamp(aFrameData.mTimestamp()),
+      mDuration(aFrameData.mDuration()) {
+  MOZ_ASSERT(aHost);
+}
+
+GMPVideoi420FrameImpl::~GMPVideoi420FrameImpl() = default;
+
+bool GMPVideoi420FrameImpl::InitFrameData(GMPVideoi420FrameData& aFrameData) {
+  mYPlane.InitPlaneData(aFrameData.mYPlane());
+  mUPlane.InitPlaneData(aFrameData.mUPlane());
+  mVPlane.InitPlaneData(aFrameData.mVPlane());
+  aFrameData.mWidth() = mWidth;
+  aFrameData.mHeight() = mHeight;
+  aFrameData.mTimestamp() = mTimestamp;
+  aFrameData.mDuration() = mDuration;
+  return true;
+}
+
+GMPVideoFrameFormat GMPVideoi420FrameImpl::GetFrameFormat() {
+  return kGMPI420VideoFrame;
+}
+
+void GMPVideoi420FrameImpl::Destroy() { delete this; }
+
+/* static */
+bool GMPVideoi420FrameImpl::CheckFrameData(
+    const GMPVideoi420FrameData& aFrameData) {
+  // We may be passed the "wrong" shmem (one smaller than the actual size).
+  // This implies a bug or serious error on the child size.  Ignore this frame
+  // if so. Note: Size() greater than expected is also an error, but with no
+  // negative consequences
+  int32_t half_width = (aFrameData.mWidth() + 1) / 2;
+  if ((aFrameData.mYPlane().mStride() <= 0) ||
+      (aFrameData.mYPlane().mSize() <= 0) ||
+      (aFrameData.mUPlane().mStride() <= 0) ||
+      (aFrameData.mUPlane().mSize() <= 0) ||
+      (aFrameData.mVPlane().mStride() <= 0) ||
+      (aFrameData.mVPlane().mSize() <= 0) ||
+      (aFrameData.mYPlane().mSize() >
+       (int32_t)aFrameData.mYPlane().mBuffer().Size<uint8_t>()) ||
+      (aFrameData.mUPlane().mSize() >
+       (int32_t)aFrameData.mUPlane().mBuffer().Size<uint8_t>()) ||
+      (aFrameData.mVPlane().mSize() >
+       (int32_t)aFrameData.mVPlane().mBuffer().Size<uint8_t>()) ||
+      (aFrameData.mYPlane().mStride() < aFrameData.mWidth()) ||
+      (aFrameData.mUPlane().mStride() < half_width) ||
+      (aFrameData.mVPlane().mStride() < half_width) ||
+      (aFrameData.mYPlane().mSize() <
+       aFrameData.mYPlane().mStride() * aFrameData.mHeight()) ||
+      (aFrameData.mUPlane().mSize() <
+       aFrameData.mUPlane().mStride() * ((aFrameData.mHeight() + 1) / 2)) ||
+      (aFrameData.mVPlane().mSize() <
+       aFrameData.mVPlane().mStride() * ((aFrameData.mHeight() + 1) / 2))) {
+    return false;
+  }
+  return true;
+}
+
+bool GMPVideoi420FrameImpl::CheckDimensions(int32_t aWidth, int32_t aHeight,
+                                            int32_t aStride_y,
+                                            int32_t aStride_u,
+                                            int32_t aStride_v) {
+  int32_t half_width = (aWidth + 1) / 2;
+  if (aWidth < 1 || aHeight < 1 || aStride_y < aWidth ||
+      aStride_u < half_width || aStride_v < half_width ||
+      !(CheckedInt<int32_t>(aHeight) * aStride_y +
+        ((CheckedInt<int32_t>(aHeight) + 1) / 2) *
+            (CheckedInt<int32_t>(aStride_u) + aStride_v))
+           .isValid()) {
+    return false;
+  }
+  return true;
+}
+
+const GMPPlaneImpl* GMPVideoi420FrameImpl::GetPlane(GMPPlaneType aType) const {
+  switch (aType) {
+    case kGMPYPlane:
+      return &mYPlane;
+    case kGMPUPlane:
+      return &mUPlane;
+    case kGMPVPlane:
+      return &mVPlane;
+    default:
+      MOZ_CRASH("Unknown plane type!");
+  }
+  return nullptr;
+}
+
+GMPPlaneImpl* GMPVideoi420FrameImpl::GetPlane(GMPPlaneType aType) {
+  switch (aType) {
+    case kGMPYPlane:
+      return &mYPlane;
+    case kGMPUPlane:
+      return &mUPlane;
+    case kGMPVPlane:
+      return &mVPlane;
+    default:
+      MOZ_CRASH("Unknown plane type!");
+  }
+  return nullptr;
+}
+
+GMPErr GMPVideoi420FrameImpl::CreateEmptyFrame(int32_t aWidth, int32_t aHeight,
+                                               int32_t aStride_y,
+                                               int32_t aStride_u,
+                                               int32_t aStride_v) {
+  if (!CheckDimensions(aWidth, aHeight, aStride_y, aStride_u, aStride_v)) {
+    return GMPGenericErr;
+  }
+
+  int32_t size_y = aStride_y * aHeight;
+  int32_t half_height = (aHeight + 1) / 2;
+  int32_t size_u = aStride_u * half_height;
+  int32_t size_v = aStride_v * half_height;
+
+  GMPErr err = mYPlane.CreateEmptyPlane(size_y, aStride_y, size_y);
+  if (err != GMPNoErr) {
+    return err;
+  }
+  err = mUPlane.CreateEmptyPlane(size_u, aStride_u, size_u);
+  if (err != GMPNoErr) {
+    return err;
+  }
+  err = mVPlane.CreateEmptyPlane(size_v, aStride_v, size_v);
+  if (err != GMPNoErr) {
+    return err;
+  }
+
+  mWidth = aWidth;
+  mHeight = aHeight;
+  mTimestamp = 0ll;
+  mDuration = 0ll;
+
+  return GMPNoErr;
+}
+
+GMPErr GMPVideoi420FrameImpl::CreateFrame(
+    int32_t aSize_y, const uint8_t* aBuffer_y, int32_t aSize_u,
+    const uint8_t* aBuffer_u, int32_t aSize_v, const uint8_t* aBuffer_v,
+    int32_t aWidth, int32_t aHeight, int32_t aStride_y, int32_t aStride_u,
+    int32_t aStride_v) {
+  MOZ_ASSERT(aBuffer_y);
+  MOZ_ASSERT(aBuffer_u);
+  MOZ_ASSERT(aBuffer_v);
+
+  if (aSize_y < 1 || aSize_u < 1 || aSize_v < 1) {
+    return GMPGenericErr;
+  }
+
+  if (!CheckDimensions(aWidth, aHeight, aStride_y, aStride_u, aStride_v)) {
+    return GMPGenericErr;
+  }
+
+  GMPErr err = mYPlane.Copy(aSize_y, aStride_y, aBuffer_y);
+  if (err != GMPNoErr) {
+    return err;
+  }
+  err = mUPlane.Copy(aSize_u, aStride_u, aBuffer_u);
+  if (err != GMPNoErr) {
+    return err;
+  }
+  err = mVPlane.Copy(aSize_v, aStride_v, aBuffer_v);
+  if (err != GMPNoErr) {
+    return err;
+  }
+
+  mWidth = aWidth;
+  mHeight = aHeight;
+
+  return GMPNoErr;
+}
+
+GMPErr GMPVideoi420FrameImpl::CopyFrame(const GMPVideoi420Frame& aFrame) {
+  auto& f = static_cast<const GMPVideoi420FrameImpl&>(aFrame);
+
+  GMPErr err = mYPlane.Copy(f.mYPlane);
+  if (err != GMPNoErr) {
+    return err;
+  }
+
+  err = mUPlane.Copy(f.mUPlane);
+  if (err != GMPNoErr) {
+    return err;
+  }
+
+  err = mVPlane.Copy(f.mVPlane);
+  if (err != GMPNoErr) {
+    return err;
+  }
+
+  mWidth = f.mWidth;
+  mHeight = f.mHeight;
+  mTimestamp = f.mTimestamp;
+  mDuration = f.mDuration;
+
+  return GMPNoErr;
+}
+
+void GMPVideoi420FrameImpl::SwapFrame(GMPVideoi420Frame* aFrame) {
+  auto f = static_cast<GMPVideoi420FrameImpl*>(aFrame);
+  mYPlane.Swap(f->mYPlane);
+  mUPlane.Swap(f->mUPlane);
+  mVPlane.Swap(f->mVPlane);
+  std::swap(mWidth, f->mWidth);
+  std::swap(mHeight, f->mHeight);
+  std::swap(mTimestamp, f->mTimestamp);
+  std::swap(mDuration, f->mDuration);
+}
+
+uint8_t* GMPVideoi420FrameImpl::Buffer(GMPPlaneType aType) {
+  GMPPlane* p = GetPlane(aType);
+  if (p) {
+    return p->Buffer();
+  }
+  return nullptr;
+}
+
+const uint8_t* GMPVideoi420FrameImpl::Buffer(GMPPlaneType aType) const {
+  const GMPPlane* p = GetPlane(aType);
+  if (p) {
+    return p->Buffer();
+  }
+  return nullptr;
+}
+
+int32_t GMPVideoi420FrameImpl::AllocatedSize(GMPPlaneType aType) const {
+  const GMPPlane* p = GetPlane(aType);
+  if (p) {
+    return p->AllocatedSize();
+  }
+  return -1;
+}
+
+int32_t GMPVideoi420FrameImpl::Stride(GMPPlaneType aType) const {
+  const GMPPlane* p = GetPlane(aType);
+  if (p) {
+    return p->Stride();
+  }
+  return -1;
+}
+
+GMPErr GMPVideoi420FrameImpl::SetWidth(int32_t aWidth) {
+  if (!CheckDimensions(aWidth, mHeight, mYPlane.Stride(), mUPlane.Stride(),
+                       mVPlane.Stride())) {
+    return GMPGenericErr;
+  }
+  mWidth = aWidth;
+  return GMPNoErr;
+}
+
+GMPErr GMPVideoi420FrameImpl::SetHeight(int32_t aHeight) {
+  if (!CheckDimensions(mWidth, aHeight, mYPlane.Stride(), mUPlane.Stride(),
+                       mVPlane.Stride())) {
+    return GMPGenericErr;
+  }
+  mHeight = aHeight;
+  return GMPNoErr;
+}
+
+int32_t GMPVideoi420FrameImpl::Width() const { return mWidth; }
+
+int32_t GMPVideoi420FrameImpl::Height() const { return mHeight; }
+
+void GMPVideoi420FrameImpl::SetTimestamp(uint64_t aTimestamp) {
+  mTimestamp = aTimestamp;
+}
+
+uint64_t GMPVideoi420FrameImpl::Timestamp() const { return mTimestamp; }
+
+void GMPVideoi420FrameImpl::SetDuration(uint64_t aDuration) {
+  mDuration = aDuration;
+}
+
+uint64_t GMPVideoi420FrameImpl::Duration() const { return mDuration; }
+
+bool GMPVideoi420FrameImpl::IsZeroSize() const {
+  return (mYPlane.IsZeroSize() && mUPlane.IsZeroSize() && mVPlane.IsZeroSize());
+}
+
+void GMPVideoi420FrameImpl::ResetSize() {
+  mYPlane.ResetSize();
+  mUPlane.ResetSize();
+  mVPlane.ResetSize();
+}
+
+}  // namespace mozilla::gmp
diff --git a/dom/media/gmp/GMPVideoi420FrameImpl.h b/dom/media/gmp/GMPVideoi420FrameImpl.h
new file mode 100644
index 0000000000..3c78a24691
--- /dev/null
+++ b/dom/media/gmp/GMPVideoi420FrameImpl.h
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPVideoi420FrameImpl_h_
+#define GMPVideoi420FrameImpl_h_
+
+#include "gmp-video-frame-i420.h"
+#include "mozilla/ipc/Shmem.h"
+#include "GMPVideoPlaneImpl.h"
+
+namespace mozilla::gmp {
+
+class GMPVideoi420FrameData;
+
+class GMPVideoi420FrameImpl : public GMPVideoi420Frame {
+  friend struct IPC::ParamTraits<mozilla::gmp::GMPVideoi420FrameImpl>;
+
+ public:
+  explicit GMPVideoi420FrameImpl(GMPVideoHostImpl* aHost);
+  GMPVideoi420FrameImpl(const GMPVideoi420FrameData& aFrameData,
+                        GMPVideoHostImpl* aHost);
+  virtual ~GMPVideoi420FrameImpl();
+
+  static bool CheckFrameData(const GMPVideoi420FrameData& aFrameData);
+
+  bool InitFrameData(GMPVideoi420FrameData& aFrameData);
+  const GMPPlaneImpl* GetPlane(GMPPlaneType aType) const;
+  GMPPlaneImpl* GetPlane(GMPPlaneType aType);
+
+  // GMPVideoFrame
+  GMPVideoFrameFormat GetFrameFormat() override;
+  void Destroy() override;
+
+  // GMPVideoi420Frame
+  GMPErr CreateEmptyFrame(int32_t aWidth, int32_t aHeight, int32_t aStride_y,
+                          int32_t aStride_u, int32_t aStride_v) override;
+  GMPErr CreateFrame(int32_t aSize_y, const uint8_t* aBuffer_y, int32_t aSize_u,
+                     const uint8_t* aBuffer_u, int32_t aSize_v,
+                     const uint8_t* aBuffer_v, int32_t aWidth, int32_t aHeight,
+                     int32_t aStride_y, int32_t aStride_u,
+                     int32_t aStride_v) override;
+  GMPErr CopyFrame(const GMPVideoi420Frame& aFrame) override;
+  void SwapFrame(GMPVideoi420Frame* aFrame) override;
+  uint8_t* Buffer(GMPPlaneType aType) override;
+  const uint8_t* Buffer(GMPPlaneType aType) const override;
+  int32_t AllocatedSize(GMPPlaneType aType) const override;
+  int32_t Stride(GMPPlaneType aType) const override;
+  GMPErr SetWidth(int32_t aWidth) override;
+  GMPErr SetHeight(int32_t aHeight) override;
+  int32_t Width() const override;
+  int32_t Height() const override;
+  void SetTimestamp(uint64_t aTimestamp) override;
+  uint64_t Timestamp() const override;
+  void SetDuration(uint64_t aDuration) override;
+  uint64_t Duration() const override;
+  bool IsZeroSize() const override;
+  void ResetSize() override;
+
+ private:
+  bool CheckDimensions(int32_t aWidth, int32_t aHeight, int32_t aStride_y,
+                       int32_t aStride_u, int32_t aStride_v);
+
+  GMPPlaneImpl mYPlane;
+  GMPPlaneImpl mUPlane;
+  GMPPlaneImpl mVPlane;
+  int32_t mWidth;
+  int32_t mHeight;
+  uint64_t mTimestamp;
+  uint64_t mDuration;
+};
+
+}  // namespace mozilla::gmp
+
+#endif  // GMPVideoi420FrameImpl_h_
diff --git a/dom/media/gmp/PChromiumCDM.ipdl b/dom/media/gmp/PChromiumCDM.ipdl
new file mode 100644
index 0000000000..2355839c17
--- /dev/null
+++ b/dom/media/gmp/PChromiumCDM.ipdl
@@ -0,0 +1,129 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PGMPContent;
+include GMPTypes;
+
+include "GMPMessageUtils.h";
+include "ChromiumCDMParent.h";
+
+using cdm::HdcpVersion from "GMPSanitizedExports.h";
+
+namespace mozilla {
+namespace gmp {
+
+[ChildImpl=virtual, ParentImpl="ChromiumCDMParent"]
+async protocol PChromiumCDM
+{
+  manager PGMPContent;
+child:
+
+  // cdm::ContentDecryptionModule_10
+  async Init(bool aAllowDistinctiveIdentifier,
+             bool aAllowPersistentState) returns (bool aSuccess);
+
+  async GetStatusForPolicy(uint32_t aPromiseId,
+                           HdcpVersion aMinHdcpVersion);
+
+  async SetServerCertificate(uint32_t aPromiseId,
+                             uint8_t[] aServerCert);
+
+  async CreateSessionAndGenerateRequest(uint32_t aPromiseId,
+                                        uint32_t aSessionType,
+                                        uint32_t aInitDataType,
+                                        uint8_t[] aInitData);
+
+  async LoadSession(uint32_t aPromiseId,
+                    uint32_t aSessionType,
+                    nsCString aSessionId);
+
+  async UpdateSession(uint32_t aPromiseId,
+                      nsCString aSessionId,
+                      uint8_t[] aResponse);
+
+  async CloseSession(uint32_t aPromiseId,
+                     nsCString aSessionId);
+
+  async RemoveSession(uint32_t aPromiseId,
+                      nsCString aSessionId);
+
+  // This is called after the parent has verified the protection status and
+  // round tripped the call back to the child.
+  async CompleteQueryOutputProtectionStatus(bool aSuccess,
+                                            uint32_t aLinkMask,
+                                            uint32_t aProtectionMask);
+
+  async Decrypt(uint32_t aId, CDMInputBuffer aBuffer);
+
+  async InitializeVideoDecoder(CDMVideoDecoderConfig aConfig);
+
+  async DeinitializeVideoDecoder();
+
+  async ResetVideoDecoder();
+
+  async DecryptAndDecodeFrame(CDMInputBuffer aBuffer);
+
+  async Drain();
+
+  async Destroy();
+
+  async GiveBuffer(Shmem aShmem);
+
+  async PurgeShmems();
+
+
+parent:
+  async __delete__();
+
+  // cdm::Host_10
+  async OnResolvePromiseWithKeyStatus(uint32_t aPromiseId, uint32_t aKeyStatus);
+
+  async OnResolveNewSessionPromise(uint32_t aPromiseId, nsCString aSessionId);
+
+  async OnResolvePromise(uint32_t aPromiseId);
+
+  async OnRejectPromise(uint32_t aPromiseId,
+                        uint32_t aException,
+                        uint32_t aSystemCode,
+                        nsCString aErrorMessage);
+
+  async OnSessionMessage(nsCString aSessionId,
+                         uint32_t aMessageType,
+                         uint8_t[] aMessage);
+
+  async OnSessionKeysChange(nsCString aSessionId,
+                            CDMKeyInformation[] aKeysInfo);
+
+  async OnExpirationChange(nsCString aSessionId,
+                           double aSecondsSinceEpoch);
+
+  async OnSessionClosed(nsCString aSessionId);
+
+  async OnQueryOutputProtectionStatus();
+
+  async ResolveLoadSessionPromise(uint32_t aPromiseId, bool aSuccessful);
+
+  // Return values of cdm::ContentDecryptionModule_10::Decrypt
+  async Decrypted(uint32_t aId, uint32_t aStatus, Shmem aDecryptedData);
+  async DecryptFailed(uint32_t aId, uint32_t aStatus);
+
+  async OnDecoderInitDone(uint32_t aStatus);
+
+  // Return values of cdm::ContentDecryptionModule_10::DecryptAndDecodeFrame
+  async DecodedShmem(CDMVideoFrame aFrame, Shmem aData);
+  async DecodedData(CDMVideoFrame aFrame, uint8_t[] aData);
+  async DecodeFailed(uint32_t aStatus);
+
+  async ResetVideoDecoderComplete();
+
+  async DrainComplete();
+
+  async Shutdown();
+
+  async IncreaseShmemPoolSize();
+};
+
+} // namespace gmp
+} // namespace mozilla
diff --git a/dom/media/gmp/PGMP.ipdl b/dom/media/gmp/PGMP.ipdl
new file mode 100644
index 0000000000..5b8e484f42
--- /dev/null
+++ b/dom/media/gmp/PGMP.ipdl
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PGMPContent;
+include protocol PGMPTimer;
+include protocol PGMPStorage;
+include protocol PProfiler;
+
+include "mozilla/ipc/ByteBufUtils.h";
+include "GMPParent.h";
+include "GMPChild.h";
+
+using mozilla::dom::NativeThreadId from "mozilla/dom/NativeThreadId.h";
+
+namespace mozilla {
+namespace gmp {
+
+[ManualDealloc, NeedsOtherPid, NestedUpTo=inside_sync, ChildImpl="GMPChild", ParentImpl="GMPParent"]
+sync protocol PGMP
+{
+  manages PGMPTimer;
+  manages PGMPStorage;
+
+parent:
+  async InitCrashReporter(NativeThreadId threadId);
+  async PGMPTimer();
+  async PGMPStorage();
+
+  async PGMPContentChildDestroyed();
+
+  // Sent from time-to-time to limit the amount of telemetry vulnerable to loss
+  // Buffer contains bincoded Rust structs.
+  // https://firefox-source-docs.mozilla.org/toolkit/components/glean/dev/ipc.html
+  async FOGData(ByteBuf buf);
+
+child:
+  async CrashPluginNow();
+  [Nested=inside_sync] sync StartPlugin(nsString adapter);
+  async ProvideStorageId(nsCString storageId);
+  async PreloadLibs(nsCString libs);
+  async CloseActive();
+  async InitGMPContentChild(Endpoint<PGMPContentChild> endpoint);
+  async InitProfiler(Endpoint<PProfilerChild> endpoint);
+
+  // Tells the GMP process to flush any pending telemetry.
+  // Used in tests and ping assembly. Buffer contains bincoded Rust structs.
+  // https://firefox-source-docs.mozilla.org/toolkit/components/glean/dev/ipc.html
+  async FlushFOGData() returns (ByteBuf buf);
+
+  // Test-only method.
+  // Asks the GMP process to trigger test-only instrumentation.
+  // The unused returned value is to have a promise we can await.
+  async TestTriggerMetrics() returns (bool unused);
+};
+
+} // namespace gmp
+} // namespace mozilla
diff --git a/dom/media/gmp/PGMPContent.ipdl b/dom/media/gmp/PGMPContent.ipdl
new file mode 100644
index 0000000000..db47aadc62
--- /dev/null
+++ b/dom/media/gmp/PGMPContent.ipdl
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PGMPVideoDecoder;
+include protocol PGMPVideoEncoder;
+include protocol PChromiumCDM;
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+include protocol PSandboxTesting;
+#endif
+
+include "GMPContentChild.h";
+
+namespace mozilla {
+namespace gmp {
+
+[NeedsOtherPid, ChildImpl="GMPContentChild", ParentImpl=virtual]
+sync protocol PGMPContent
+{
+  manages PGMPVideoDecoder;
+  manages PGMPVideoEncoder;
+  manages PChromiumCDM;
+
+child:
+  async PGMPVideoDecoder();
+  async PGMPVideoEncoder();
+  async PChromiumCDM(nsCString aKeySystem);
+
+#if defined(MOZ_SANDBOX) && defined(MOZ_DEBUG) && defined(ENABLE_TESTS)
+  async InitSandboxTesting(Endpoint<PSandboxTestingChild> aEndpoint);
+#endif
+};
+
+} // namespace gmp
+} // namespace mozilla
diff --git a/dom/media/gmp/PGMPService.ipdl b/dom/media/gmp/PGMPService.ipdl
new file mode 100644
index 0000000000..0d8bbb7ffc
--- /dev/null
+++ b/dom/media/gmp/PGMPService.ipdl
@@ -0,0 +1,36 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PGMPContent;
+include GMPTypes;
+
+using base::ProcessId from "base/process.h";
+
+namespace mozilla {
+namespace gmp {
+
+[NeedsOtherPid, ChildImpl=virtual, ParentImpl=virtual]
+sync protocol PGMPService
+{
+parent:
+  sync LaunchGMP(NodeIdVariant nodeIdVariant,
+                 nsCString api,
+                 nsCString[] tags,
+                 ProcessId[] alreadyBridgedTo)
+    returns (uint32_t pluginId,
+             ProcessId id,
+             nsCString displayName,
+             Endpoint<PGMPContentParent> endpoint,
+             nsresult aResult,
+             nsCString aErrorDescription);
+
+  sync GetGMPNodeId(nsString origin, nsString topLevelOrigin, nsString gmpName)
+    returns (nsCString id);
+child:
+  async BeginShutdown();
+};
+
+} // namespace gmp
+} // namespace mozilla
diff --git a/dom/media/gmp/PGMPStorage.ipdl b/dom/media/gmp/PGMPStorage.ipdl
new file mode 100644
index 0000000000..6efe7fbb23
--- /dev/null
+++ b/dom/media/gmp/PGMPStorage.ipdl
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PGMP;
+include GMPTypes;
+
+include "GMPStorageChild.h";
+
+using GMPErr from "gmp-errors.h";
+
+namespace mozilla {
+namespace gmp {
+
+[ManualDealloc, ChildImpl="GMPStorageChild", ParentImpl=virtual]
+async protocol PGMPStorage
+{
+  manager PGMP;
+
+child:
+  async OpenComplete(nsCString aRecordName, GMPErr aStatus);
+  async ReadComplete(nsCString aRecordName, GMPErr aStatus, uint8_t[] aBytes);
+  async WriteComplete(nsCString aRecordName, GMPErr aStatus);
+  async Shutdown();
+
+parent:
+  async Open(nsCString aRecordName);
+  async Read(nsCString aRecordName);
+  async Write(nsCString aRecordName, uint8_t[] aBytes);
+  async Close(nsCString aRecordName);
+  async __delete__();
+
+};
+
+} // namespace gmp
+} // namespace mozilla
diff --git a/dom/media/gmp/PGMPTimer.ipdl b/dom/media/gmp/PGMPTimer.ipdl
new file mode 100644
index 0000000000..c6c8170b43
--- /dev/null
+++ b/dom/media/gmp/PGMPTimer.ipdl
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PGMP;
+
+include "GMPTimerParent.h";
+include "GMPTimerChild.h";
+
+namespace mozilla {
+namespace gmp {
+
+[ManualDealloc, ChildImpl="GMPTimerChild", ParentImpl="GMPTimerParent"]
+async protocol PGMPTimer
+{
+  manager PGMP;
+child:
+  async TimerExpired(uint32_t aTimerId);
+parent:
+  async SetTimer(uint32_t aTimerId, uint32_t aTimeoutMs);
+  async __delete__();
+};
+
+} // namespace gmp
+} // namespace mozilla
diff --git a/dom/media/gmp/PGMPVideoDecoder.ipdl b/dom/media/gmp/PGMPVideoDecoder.ipdl
new file mode 100644
index 0000000000..e0c7a21a64
--- /dev/null
+++ b/dom/media/gmp/PGMPVideoDecoder.ipdl
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PGMPContent;
+include GMPTypes;
+
+using GMPVideoCodec from "gmp-video-codec.h";
+using GMPErr from "gmp-errors.h";
+
+include "GMPMessageUtils.h";
+include "GMPVideoDecoderChild.h";
+
+namespace mozilla {
+namespace gmp {
+
+[ChildImpl="GMPVideoDecoderChild", ParentImpl=virtual]
+sync protocol PGMPVideoDecoder
+{
+  manager PGMPContent;
+child:
+  async InitDecode(GMPVideoCodec aCodecSettings,
+                   uint8_t[] aCodecSpecific,
+                   int32_t aCoreCount);
+  async Decode(GMPVideoEncodedFrameData aInputFrame,
+               bool aMissingFrames,
+               uint8_t[] aCodecSpecificInfo,
+               int64_t aRenderTimeMs);
+  async Reset();
+  async Drain();
+  async DecodingComplete();
+  async ChildShmemForPool(Shmem aFrameBuffer);
+
+parent:
+  async __delete__();
+  async Decoded(GMPVideoi420FrameData aDecodedFrame);
+  async ReceivedDecodedReferenceFrame(uint64_t aPictureId);
+  async ReceivedDecodedFrame(uint64_t aPictureId);
+  async InputDataExhausted();
+  async DrainComplete();
+  async ResetComplete();
+  async Error(GMPErr aErr);
+  async Shutdown();
+  async ParentShmemForPool(Shmem aEncodedBuffer);
+  sync NeedShmem(uint32_t aFrameBufferSize) returns (Shmem aMem);
+};
+
+} // namespace gmp
+} // namespace mozilla
diff --git a/dom/media/gmp/PGMPVideoEncoder.ipdl b/dom/media/gmp/PGMPVideoEncoder.ipdl
new file mode 100644
index 0000000000..afd4f7ce9a
--- /dev/null
+++ b/dom/media/gmp/PGMPVideoEncoder.ipdl
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PGMPContent;
+include GMPTypes;
+
+using GMPVideoCodec from "gmp-video-codec.h";
+using GMPVideoFrameType from "gmp-video-frame-encoded.h";
+using GMPErr from "gmp-errors.h";
+
+include "GMPMessageUtils.h";
+include "GMPVideoEncoderChild.h";
+
+namespace mozilla {
+namespace gmp {
+
+[ChildImpl="GMPVideoEncoderChild", ParentImpl=virtual]
+sync protocol PGMPVideoEncoder
+{
+  manager PGMPContent;
+child:
+  async InitEncode(GMPVideoCodec aCodecSettings,
+                   uint8_t[] aCodecSpecific,
+                   int32_t aNumberOfCores,
+                   uint32_t aMaxPayloadSize);
+  async Encode(GMPVideoi420FrameData aInputFrame,
+               uint8_t[] aCodecSpecificInfo,
+               GMPVideoFrameType[] aFrameTypes);
+  async SetChannelParameters(uint32_t aPacketLoss, uint32_t aRTT);
+  async SetRates(uint32_t aNewBitRate, uint32_t aFrameRate);
+  async SetPeriodicKeyFrames(bool aEnable);
+  async EncodingComplete();
+  async ChildShmemForPool(Shmem aEncodedBuffer);
+
+parent:
+  async __delete__();
+  async Encoded(GMPVideoEncodedFrameData aEncodedFrame,
+                uint8_t[] aCodecSpecificInfo);
+  async Error(GMPErr aErr);
+  async Shutdown();
+  async ParentShmemForPool(Shmem aFrameBuffer);
+  sync NeedShmem(uint32_t aEncodedBufferSize) returns (Shmem aMem);
+};
+
+} // namespace gmp
+} // namespace mozilla
diff --git a/dom/media/gmp/README.txt b/dom/media/gmp/README.txt
new file mode 100644
index 0000000000..189cf3b302
--- /dev/null
+++ b/dom/media/gmp/README.txt
@@ -0,0 +1 @@
+This directory contains code supporting Gecko Media Plugins (GMPs). The GMP API is not the same thing as the Media Plugin API (MPAPI).
diff --git a/dom/media/gmp/gmp-api/gmp-entrypoints.h b/dom/media/gmp/gmp-api/gmp-entrypoints.h
new file mode 100644
index 0000000000..fd2457e9be
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-entrypoints.h
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_ENTRYPOINTS_h_
+#define GMP_ENTRYPOINTS_h_
+
+#include "gmp-errors.h"
+#include "gmp-platform.h"
+
+/* C functions exposed by Gecko Media Plugin shared library. */
+
+// GMPInit
+// - Called once after plugin library is loaded, before GMPGetAPI or GMPShutdown
+// are called.
+// - Called on main thread.
+// - 'aPlatformAPI' is a structure containing platform-provided APIs. It is
+// valid until
+//   'GMPShutdown' is called. Owned and must be deleted by plugin.
+typedef GMPErr (*GMPInitFunc)(const GMPPlatformAPI* aPlatformAPI);
+
+// GMPGetAPI
+// - Called when host wants to use an API.
+// - Called on main thread.
+// - 'aAPIName' is a string indicating the API being requested. This should
+//   match one of the GMP_API_* macros. Subsequent iterations of the GMP_APIs
+//   may change the value of the GMP_API_* macros when ABI changes occur. So
+//   make sure you compare aAPIName against the corresponding GMP_API_* macro!
+// - 'aHostAPI' is the host API which is specific to the API being requested
+//   from the plugin. It is valid so long as the API object requested from the
+//   plugin is valid. It is owned by the host, plugin should not attempt to
+//   delete. May be null.
+// - 'aPluginAPI' is for returning the requested API. Destruction of the
+// requsted
+//   API object is defined by the API.
+typedef GMPErr (*GMPGetAPIFunc)(const char* aAPIName, void* aHostAPI,
+                                void** aPluginAPI);
+
+// GMPShutdown
+// - Called once before exiting process (unloading library).
+// - Called on main thread.
+typedef void (*GMPShutdownFunc)(void);
+
+#endif  // GMP_ENTRYPOINTS_h_
diff --git a/dom/media/gmp/gmp-api/gmp-errors.h b/dom/media/gmp/gmp-api/gmp-errors.h
new file mode 100644
index 0000000000..a95db1f7a5
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-errors.h
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_ERRORS_h_
+#define GMP_ERRORS_h_
+
+typedef enum {
+  GMPNoErr = 0,
+  GMPGenericErr = 1,
+  GMPClosedErr = 2,
+  GMPAllocErr = 3,
+  GMPNotImplementedErr = 4,
+  GMPRecordInUse = 5,
+  GMPQuotaExceededErr = 6,
+  GMPDecodeErr = 7,
+  GMPEncodeErr = 8,
+  GMPNoKeyErr = 9,
+  GMPCryptoErr = 10,
+  GMPEndOfEnumeration = 11,
+  GMPInvalidArgErr = 12,
+  GMPAbortedErr = 13,
+  GMPRecordCorrupted = 14,
+  GMPLastErr  // Placeholder, must be last. This enum's values must remain
+              // consecutive!
+} GMPErr;
+
+#define GMP_SUCCEEDED(x) ((x) == GMPNoErr)
+#define GMP_FAILED(x) ((x) != GMPNoErr)
+
+#endif  // GMP_ERRORS_h_
diff --git a/dom/media/gmp/gmp-api/gmp-platform.h b/dom/media/gmp/gmp-api/gmp-platform.h
new file mode 100644
index 0000000000..530abcbbfe
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-platform.h
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_PLATFORM_h_
+#define GMP_PLATFORM_h_
+
+#include "gmp-errors.h"
+#include "gmp-storage.h"
+#include <stdint.h>
+
+/* Platform helper API. */
+
+class GMPTask {
+ public:
+  virtual void Destroy() = 0;  // Deletes object.
+  virtual ~GMPTask() = default;
+  virtual void Run() = 0;
+};
+
+class GMPThread {
+ public:
+  virtual ~GMPThread() = default;
+  virtual void Post(GMPTask* aTask) = 0;
+  virtual void Join() = 0;  // Deletes object after join completes.
+};
+
+// A re-entrant monitor; can be locked from the same thread multiple times.
+// Must be unlocked the same number of times it's locked.
+class GMPMutex {
+ public:
+  virtual ~GMPMutex() = default;
+  virtual void Acquire() = 0;
+  virtual void Release() = 0;
+  virtual void Destroy() = 0;  // Deletes object.
+};
+
+// Time is defined as the number of milliseconds since the
+// Epoch (00:00:00 UTC, January 1, 1970).
+typedef int64_t GMPTimestamp;
+
+typedef GMPErr (*GMPCreateThreadPtr)(GMPThread** aThread);
+typedef GMPErr (*GMPRunOnMainThreadPtr)(GMPTask* aTask);
+typedef GMPErr (*GMPSyncRunOnMainThreadPtr)(GMPTask* aTask);
+typedef GMPErr (*GMPCreateMutexPtr)(GMPMutex** aMutex);
+
+// Call on main thread only.
+typedef GMPErr (*GMPCreateRecordPtr)(const char* aRecordName,
+                                     uint32_t aRecordNameSize,
+                                     GMPRecord** aOutRecord,
+                                     GMPRecordClient* aClient);
+
+// Call on main thread only.
+typedef GMPErr (*GMPSetTimerOnMainThreadPtr)(GMPTask* aTask,
+                                             int64_t aTimeoutMS);
+typedef GMPErr (*GMPGetCurrentTimePtr)(GMPTimestamp* aOutTime);
+
+struct GMPPlatformAPI {
+  // Increment the version when things change. Can only add to the struct,
+  // do not change what already exists. Pointers to functions may be NULL
+  // when passed to plugins, but beware backwards compat implications of
+  // doing that.
+  uint16_t version;  // Currently version 0
+
+  GMPCreateThreadPtr createthread;
+  GMPRunOnMainThreadPtr runonmainthread;
+  GMPSyncRunOnMainThreadPtr syncrunonmainthread;
+  GMPCreateMutexPtr createmutex;
+  GMPCreateRecordPtr createrecord;
+  GMPSetTimerOnMainThreadPtr settimer;
+  GMPGetCurrentTimePtr getcurrenttime;
+};
+
+#endif  // GMP_PLATFORM_h_
diff --git a/dom/media/gmp/gmp-api/gmp-storage.h b/dom/media/gmp/gmp-api/gmp-storage.h
new file mode 100644
index 0000000000..af53256d43
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-storage.h
@@ -0,0 +1,110 @@
+/*
+ * Copyright 2013, Mozilla Foundation and contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef GMP_STORAGE_h_
+#define GMP_STORAGE_h_
+
+#include "gmp-errors.h"
+#include <stdint.h>
+
+// Maximum size of a record, in bytes; 10 megabytes.
+#define GMP_MAX_RECORD_SIZE (10 * 1024 * 1024)
+
+// Maximum length of a record name in bytes.
+#define GMP_MAX_RECORD_NAME_SIZE 2000
+
+// Provides basic per-origin storage for CDMs. GMPRecord instances can be
+// retrieved by calling GMPPlatformAPI->openstorage. Multiple GMPRecords
+// with different names can be open at once, but a single record can only
+// be opened by one client at a time. This interface is asynchronous, with
+// results being returned via callbacks to the GMPRecordClient pointer
+// provided to the GMPPlatformAPI->openstorage call, on the main thread.
+//
+// Lifecycle: Once opened, the GMPRecord object remains allocated until
+// GMPRecord::Close() is called. If any GMPRecord function, either
+// synchronously or asynchronously through a GMPRecordClient callback,
+// returns an error, the GMP is responsible for calling Close() on the
+// GMPRecord to delete the GMPRecord object's memory. If your GMP does not
+// call Close(), the GMPRecord's memory will leak.
+class GMPRecord {
+ public:
+  // Opens the record. Calls OpenComplete() once the record is open.
+  // Note: Only work when GMP is loading content from a webserver.
+  // Does not work for web pages on loaded from disk.
+  // Note: OpenComplete() is only called if this returns GMPNoErr.
+  virtual GMPErr Open() = 0;
+
+  // Reads the entire contents of the record, and calls
+  // GMPRecordClient::ReadComplete() once the operation is complete.
+  // Note: ReadComplete() is only called if this returns GMPNoErr.
+  virtual GMPErr Read() = 0;
+
+  // Writes aDataSize bytes of aData into the record, overwriting the
+  // contents of the record, truncating it to aDataSize length.
+  // Overwriting with 0 bytes "deletes" the record.
+  // Note: WriteComplete is only called if this returns GMPNoErr.
+  virtual GMPErr Write(const uint8_t* aData, uint32_t aDataSize) = 0;
+
+  // Closes a record, deletes the GMPRecord object. The GMPRecord object
+  // must not be used after this is called, request a new one with
+  // GMPPlatformAPI->openstorage to re-open this record. Cancels all
+  // callbacks.
+  virtual GMPErr Close() = 0;
+
+  virtual ~GMPRecord() = default;
+};
+
+// Callback object that receives the results of GMPRecord calls. Callbacks
+// run asynchronously to the GMPRecord call, on the main thread.
+class GMPRecordClient {
+ public:
+  // Response to a GMPRecord::Open() call with the open |status|.
+  // aStatus values:
+  // - GMPNoErr - Record opened successfully. Record may be empty.
+  // - GMPRecordInUse - This record is in use by another client.
+  // - GMPGenericErr - Unspecified error.
+  // If aStatus is not GMPNoErr, the GMPRecord is unusable, and you must
+  // call Close() on the GMPRecord to dispose of it.
+  virtual void OpenComplete(GMPErr aStatus) = 0;
+
+  // Response to a GMPRecord::Read() call, where aData is the record contents,
+  // of length aDataSize.
+  // aData is only valid for the duration of the call to ReadComplete.
+  // Copy it if you want to hang onto it!
+  // aStatus values:
+  // - GMPNoErr - Record contents read successfully, aDataSize 0 means record
+  //   is empty.
+  // - GMPRecordInUse - There are other operations or clients in use on
+  //   this record.
+  // - GMPGenericErr - Unspecified error.
+  // If aStatus is not GMPNoErr, the GMPRecord is unusable, and you must
+  // call Close() on the GMPRecord to dispose of it.
+  virtual void ReadComplete(GMPErr aStatus, const uint8_t* aData,
+                            uint32_t aDataSize) = 0;
+
+  // Response to a GMPRecord::Write() call.
+  // - GMPNoErr - File contents written successfully.
+  // - GMPRecordInUse - There are other operations or clients in use on
+  //   this record.
+  // - GMPGenericErr - Unspecified error.
+  // If aStatus is not GMPNoErr, the GMPRecord is unusable, and you must
+  // call Close() on the GMPRecord to dispose of it.
+  virtual void WriteComplete(GMPErr aStatus) = 0;
+
+  virtual ~GMPRecordClient() = default;
+};
+
+#endif  // GMP_STORAGE_h_
diff --git a/dom/media/gmp/gmp-api/gmp-video-codec.h b/dom/media/gmp/gmp-api/gmp-video-codec.h
new file mode 100644
index 0000000000..81c32e6372
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-video-codec.h
@@ -0,0 +1,220 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_VIDEO_CODEC_h_
+#define GMP_VIDEO_CODEC_h_
+
+#include <stdint.h>
+#include <stddef.h>
+
+enum { kGMPPayloadNameSize = 32 };
+enum { kGMPMaxSimulcastStreams = 4 };
+
+enum GMPVideoCodecComplexity {
+  kGMPComplexityNormal = 0,
+  kGMPComplexityHigh = 1,
+  kGMPComplexityHigher = 2,
+  kGMPComplexityMax = 3,
+  kGMPComplexityInvalid  // Should always be last
+};
+
+enum GMPVP8ResilienceMode {
+  kResilienceOff,     // The stream produced by the encoder requires a
+                      // recovery frame (typically a key frame) to be
+                      // decodable after a packet loss.
+  kResilientStream,   // A stream produced by the encoder is resilient to
+                      // packet losses, but packets within a frame subsequent
+                      // to a loss can't be decoded.
+  kResilientFrames,   // Same as kResilientStream but with added resilience
+                      // within a frame.
+  kResilienceInvalid  // Should always be last.
+};
+
+// VP8 specific
+struct GMPVideoCodecVP8 {
+  bool mPictureLossIndicationOn;
+  bool mFeedbackModeOn;
+  GMPVideoCodecComplexity mComplexity;
+  GMPVP8ResilienceMode mResilience;
+  uint32_t mNumberOfTemporalLayers;
+  bool mDenoisingOn;
+  bool mErrorConcealmentOn;
+  bool mAutomaticResizeOn;
+};
+
+// H264 specific
+
+// Needs to match a binary spec for this structure.
+// Note: the mSPS at the end of this structure is variable length.
+struct GMPVideoCodecH264AVCC {
+  uint8_t mVersion;  // == 0x01
+  uint8_t mProfile;  // these 3 are profile_level_id
+  uint8_t mConstraints;
+  uint8_t mLevel;
+  uint8_t mLengthSizeMinusOne;  // lower 2 bits (== GMPBufferType-1). Top 6
+                                // reserved (1's)
+
+  // SPS/PPS will not generally be present for interactive use unless SDP
+  // parameter-sets are used.
+  uint8_t mNumSPS;  // lower 5 bits; top 5 reserved (1's)
+
+  /*** uint8_t   mSPS[];  (Not defined due to compiler warnings and
+   * warnings-as-errors ...) **/
+  // Following mNumSPS is a variable number of bytes, which is the SPS and PPS.
+  // Each SPS == 16 bit size, ("N"), then "N" bytes,
+  // then uint8_t mNumPPS, then each PPS == 16 bit size ("N"), then "N" bytes.
+};
+
+// Codec specific data for H.264 decoding/encoding.
+// Cast the "aCodecSpecific" parameter of GMPVideoDecoder::InitDecode() and
+// GMPVideoEncoder::InitEncode() to this structure.
+struct GMPVideoCodecH264 {
+  uint8_t mPacketizationMode;  // 0 or 1
+  struct GMPVideoCodecH264AVCC
+      mAVCC;  // holds a variable-sized struct GMPVideoCodecH264AVCC mAVCC;
+};
+
+enum GMPVideoCodecType {
+  kGMPVideoCodecVP8,
+
+  // Encoded frames are in AVCC format; NAL length field of 4 bytes, followed
+  // by frame data. May be multiple NALUs per sample. Codec specific extra data
+  // is the AVCC extra data (in AVCC format).
+  kGMPVideoCodecH264,
+  kGMPVideoCodecVP9,
+  kGMPVideoCodecInvalid  // Should always be last.
+};
+
+// Simulcast is when the same stream is encoded multiple times with different
+// settings such as resolution.
+struct GMPSimulcastStream {
+  uint32_t mWidth;
+  uint32_t mHeight;
+  uint32_t mNumberOfTemporalLayers;
+  uint32_t mMaxBitrate;     // kilobits/sec.
+  uint32_t mTargetBitrate;  // kilobits/sec.
+  uint32_t mMinBitrate;     // kilobits/sec.
+  uint32_t mQPMax;          // minimum quality
+};
+
+enum GMPVideoCodecMode {
+  kGMPRealtimeVideo,
+  kGMPScreensharing,
+  kGMPStreamingVideo,
+  kGMPCodecModeInvalid  // Should always be last.
+};
+
+enum GMPApiVersion {
+  kGMPVersion32 =
+      1,  // leveraging that V32 had mCodecType first, and only supported H264
+  kGMPVersion33 = 33,
+};
+
+struct GMPVideoCodec {
+  uint32_t mGMPApiVersion;
+
+  GMPVideoCodecType mCodecType;
+  char mPLName[kGMPPayloadNameSize];  // Must be NULL-terminated!
+  uint32_t mPLType;
+
+  uint32_t mWidth;
+  uint32_t mHeight;
+
+  uint32_t mStartBitrate;  // kilobits/sec.
+  uint32_t mMaxBitrate;    // kilobits/sec.
+  uint32_t mMinBitrate;    // kilobits/sec.
+  uint32_t mMaxFramerate;
+
+  bool mFrameDroppingOn;
+  int32_t mKeyFrameInterval;
+
+  uint32_t mQPMax;
+  uint32_t mNumberOfSimulcastStreams;
+  GMPSimulcastStream mSimulcastStream[kGMPMaxSimulcastStreams];
+
+  GMPVideoCodecMode mMode;
+};
+
+// Either single encoded unit, or multiple units separated by 8/16/24/32
+// bit lengths, all with the same timestamp.  Note there is no final 0-length
+// entry; one should check the overall end-of-buffer against where the next
+// length would be.
+enum GMPBufferType {
+  GMP_BufferSingle = 0,
+  GMP_BufferLength8,
+  GMP_BufferLength16,
+  GMP_BufferLength24,
+  GMP_BufferLength32,
+  GMP_BufferInvalid,
+};
+
+struct GMPCodecSpecificInfoGeneric {
+  uint8_t mSimulcastIdx;
+};
+
+struct GMPCodecSpecificInfoH264 {
+  uint8_t mSimulcastIdx;
+};
+
+// Note: if any pointers are added to this struct, it must be fitted
+// with a copy-constructor. See below.
+struct GMPCodecSpecificInfoVP8 {
+  bool mHasReceivedSLI;
+  uint8_t mPictureIdSLI;
+  bool mHasReceivedRPSI;
+  uint64_t mPictureIdRPSI;
+  int16_t mPictureId;  // negative value to skip pictureId
+  bool mNonReference;
+  uint8_t mSimulcastIdx;
+  uint8_t mTemporalIdx;
+  bool mLayerSync;
+  int32_t mTL0PicIdx;  // negative value to skip tl0PicIdx
+  int8_t mKeyIdx;      // negative value to skip keyIdx
+};
+
+union GMPCodecSpecificInfoUnion {
+  GMPCodecSpecificInfoGeneric mGeneric;
+  GMPCodecSpecificInfoVP8 mVP8;
+  GMPCodecSpecificInfoH264 mH264;
+};
+
+// Note: if any pointers are added to this struct or its sub-structs, it
+// must be fitted with a copy-constructor. This is because it is copied
+// in the copy-constructor of VCMEncodedFrame.
+struct GMPCodecSpecificInfo {
+  GMPVideoCodecType mCodecType;
+  GMPBufferType mBufferType;
+  GMPCodecSpecificInfoUnion mCodecSpecific;
+};
+
+#endif  // GMP_VIDEO_CODEC_h_
diff --git a/dom/media/gmp/gmp-api/gmp-video-decode.h b/dom/media/gmp/gmp-api/gmp-video-decode.h
new file mode 100644
index 0000000000..561e841d39
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-video-decode.h
@@ -0,0 +1,125 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_VIDEO_DECODE_h_
+#define GMP_VIDEO_DECODE_h_
+
+#include "gmp-errors.h"
+#include "gmp-video-frame-i420.h"
+#include "gmp-video-frame-encoded.h"
+#include "gmp-video-codec.h"
+#include <stdint.h>
+
+// ALL METHODS MUST BE CALLED ON THE MAIN THREAD
+class GMPVideoDecoderCallback {
+ public:
+  virtual ~GMPVideoDecoderCallback() {}
+
+  virtual void Decoded(GMPVideoi420Frame* aDecodedFrame) = 0;
+
+  virtual void ReceivedDecodedReferenceFrame(const uint64_t aPictureId) = 0;
+
+  virtual void ReceivedDecodedFrame(const uint64_t aPictureId) = 0;
+
+  virtual void InputDataExhausted() = 0;
+
+  virtual void DrainComplete() = 0;
+
+  virtual void ResetComplete() = 0;
+
+  // Called when the decoder encounters a catestrophic error and cannot
+  // continue. Gecko will not send any more input for decoding.
+  virtual void Error(GMPErr aError) = 0;
+};
+
+#define GMP_API_VIDEO_DECODER "decode-video"
+
+// Video decoding for a single stream. A GMP may be asked to create multiple
+// decoders concurrently.
+//
+// API name macro: GMP_API_VIDEO_DECODER
+// Host API: GMPVideoHost
+//
+// ALL METHODS MUST BE CALLED ON THE MAIN THREAD
+class GMPVideoDecoder {
+ public:
+  virtual ~GMPVideoDecoder() {}
+
+  // - aCodecSettings: Details of decoder to create.
+  // - aCodecSpecific: codec specific data, cast to a GMPVideoCodecXXX struct
+  //                   to get codec specific config data.
+  // - aCodecSpecificLength: number of bytes in aCodecSpecific.
+  // - aCallback: Subclass should retain reference to it until DecodingComplete
+  //              is called. Do not attempt to delete it, host retains
+  //              ownership.
+  // aCoreCount: number of CPU cores.
+  virtual void InitDecode(const GMPVideoCodec& aCodecSettings,
+                          const uint8_t* aCodecSpecific,
+                          uint32_t aCodecSpecificLength,
+                          GMPVideoDecoderCallback* aCallback,
+                          int32_t aCoreCount) = 0;
+
+  // Decode encoded frame (as a part of a video stream). The decoded frame
+  // will be returned to the user through the decode complete callback.
+  //
+  // - aInputFrame: Frame to decode. Call Destroy() on frame when it's decoded.
+  // - aMissingFrames: True if one or more frames have been lost since the
+  //                   previous decode call.
+  // - aCodecSpecificInfo : codec specific data, pointer to a
+  //                        GMPCodecSpecificInfo structure appropriate for
+  //                        this codec type.
+  // - aCodecSpecificInfoLength : number of bytes in aCodecSpecificInfo
+  // - renderTimeMs : System time to render in milliseconds. Only used by
+  //                  decoders with internal rendering.
+  virtual void Decode(GMPVideoEncodedFrame* aInputFrame, bool aMissingFrames,
+                      const uint8_t* aCodecSpecificInfo,
+                      uint32_t aCodecSpecificInfoLength,
+                      int64_t aRenderTimeMs = -1) = 0;
+
+  // Reset decoder state and prepare for a new call to Decode(...).
+  // Flushes the decoder pipeline.
+  // The decoder should enqueue a task to run ResetComplete() on the main
+  // thread once the reset has finished.
+  virtual void Reset() = 0;
+
+  // Output decoded frames for any data in the pipeline, regardless of ordering.
+  // All remaining decoded frames should be immediately returned via callback.
+  // The decoder should enqueue a task to run DrainComplete() on the main
+  // thread once the reset has finished.
+  virtual void Drain() = 0;
+
+  // May free decoder memory.
+  virtual void DecodingComplete() = 0;
+};
+
+#endif  // GMP_VIDEO_DECODE_h_
diff --git a/dom/media/gmp/gmp-api/gmp-video-encode.h b/dom/media/gmp/gmp-api/gmp-video-encode.h
new file mode 100644
index 0000000000..850d34abd1
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-video-encode.h
@@ -0,0 +1,133 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_VIDEO_ENCODE_h_
+#define GMP_VIDEO_ENCODE_h_
+
+#include <vector>
+#include <stdint.h>
+
+#include "gmp-errors.h"
+#include "gmp-video-frame-i420.h"
+#include "gmp-video-frame-encoded.h"
+#include "gmp-video-codec.h"
+
+// ALL METHODS MUST BE CALLED ON THE MAIN THREAD
+class GMPVideoEncoderCallback {
+ public:
+  virtual ~GMPVideoEncoderCallback() {}
+
+  virtual void Encoded(GMPVideoEncodedFrame* aEncodedFrame,
+                       const uint8_t* aCodecSpecificInfo,
+                       uint32_t aCodecSpecificInfoLength) = 0;
+
+  // Called when the encoder encounters a catestrophic error and cannot
+  // continue. Gecko will not send any more input for encoding.
+  virtual void Error(GMPErr aError) = 0;
+};
+
+#define GMP_API_VIDEO_ENCODER "encode-video"
+
+// Video encoding for a single stream. A GMP may be asked to create multiple
+// encoders concurrently.
+//
+// API name macro: GMP_API_VIDEO_ENCODER
+// Host API: GMPVideoHost
+//
+// ALL METHODS MUST BE CALLED ON THE MAIN THREAD
+class GMPVideoEncoder {
+ public:
+  virtual ~GMPVideoEncoder() {}
+
+  // Initialize the encoder with the information from the VideoCodec.
+  //
+  // Input:
+  // - codecSettings : Codec settings
+  // - aCodecSpecific : codec specific data, pointer to a
+  //                    GMPCodecSpecific structure appropriate for
+  //                    this codec type.
+  // - aCodecSpecificLength : number of bytes in aCodecSpecific
+  // - aCallback: Subclass should retain reference to it until EncodingComplete
+  //              is called. Do not attempt to delete it, host retains
+  //              ownership.
+  // - aNnumberOfCores : Number of cores available for the encoder
+  // - aMaxPayloadSize : The maximum size each payload is allowed
+  //                    to have. Usually MTU - overhead.
+  virtual void InitEncode(const GMPVideoCodec& aCodecSettings,
+                          const uint8_t* aCodecSpecific,
+                          uint32_t aCodecSpecificLength,
+                          GMPVideoEncoderCallback* aCallback,
+                          int32_t aNumberOfCores, uint32_t aMaxPayloadSize) = 0;
+
+  // Encode an I420 frame (as a part of a video stream). The encoded frame
+  // will be returned to the user through the encode complete callback.
+  //
+  // Input:
+  // - aInputFrame : Frame to be encoded
+  // - aCodecSpecificInfo : codec specific data, pointer to a
+  //                        GMPCodecSpecificInfo structure appropriate for
+  //                        this codec type.
+  // - aCodecSpecificInfoLength : number of bytes in aCodecSpecific
+  // - aFrameTypes : The frame type to encode
+  // - aFrameTypesLength : The number of elements in aFrameTypes array.
+  virtual void Encode(GMPVideoi420Frame* aInputFrame,
+                      const uint8_t* aCodecSpecificInfo,
+                      uint32_t aCodecSpecificInfoLength,
+                      const GMPVideoFrameType* aFrameTypes,
+                      uint32_t aFrameTypesLength) = 0;
+
+  // Inform the encoder about the packet loss and round trip time on the
+  // network used to decide the best pattern and signaling.
+  //
+  // - packetLoss : Fraction lost (loss rate in percent =
+  // 100 * packetLoss / 255)
+  // - rtt : Round-trip time in milliseconds
+  virtual void SetChannelParameters(uint32_t aPacketLoss, uint32_t aRTT) = 0;
+
+  // Inform the encoder about the new target bit rate.
+  //
+  // - newBitRate : New target bit rate
+  // - frameRate : The target frame rate
+  virtual void SetRates(uint32_t aNewBitRate, uint32_t aFrameRate) = 0;
+
+  // Use this function to enable or disable periodic key frames. Can be useful
+  // for codecs which have other ways of stopping error propagation.
+  //
+  // - enable : Enable or disable periodic key frames
+  virtual void SetPeriodicKeyFrames(bool aEnable) = 0;
+
+  // May free Encoder memory.
+  virtual void EncodingComplete() = 0;
+};
+
+#endif  // GMP_VIDEO_ENCODE_h_
diff --git a/dom/media/gmp/gmp-api/gmp-video-frame-encoded.h b/dom/media/gmp/gmp-api/gmp-video-frame-encoded.h
new file mode 100644
index 0000000000..42683aa129
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-video-frame-encoded.h
@@ -0,0 +1,92 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_VIDEO_FRAME_ENCODED_h_
+#define GMP_VIDEO_FRAME_ENCODED_h_
+
+#include <stdint.h>
+#include "gmp-video-frame.h"
+#include "gmp-video-codec.h"
+
+enum GMPVideoFrameType {
+  kGMPKeyFrame = 0,
+  kGMPDeltaFrame = 1,
+  kGMPGoldenFrame = 2,
+  kGMPAltRefFrame = 3,
+  kGMPSkipFrame = 4,
+  kGMPVideoFrameInvalid = 5  // Must always be last.
+};
+
+// The implementation backing this interface uses shared memory for the
+// buffer(s). This means it can only be used by the "owning" process.
+// At first the process which created the object owns it. When the object
+// is passed to an interface the creator loses ownership and must Destroy()
+// the object. Further attempts to use it may fail due to not being able to
+// access the underlying buffer(s).
+//
+// Methods that create or destroy shared memory must be called on the main
+// thread. They are marked below.
+class GMPVideoEncodedFrame : public GMPVideoFrame {
+ public:
+  // MAIN THREAD ONLY
+  virtual GMPErr CreateEmptyFrame(uint32_t aSize) = 0;
+  // MAIN THREAD ONLY
+  virtual GMPErr CopyFrame(const GMPVideoEncodedFrame& aVideoFrame) = 0;
+  virtual void SetEncodedWidth(uint32_t aEncodedWidth) = 0;
+  virtual uint32_t EncodedWidth() = 0;
+  virtual void SetEncodedHeight(uint32_t aEncodedHeight) = 0;
+  virtual uint32_t EncodedHeight() = 0;
+  // Microseconds
+  virtual void SetTimeStamp(uint64_t aTimeStamp) = 0;
+  virtual uint64_t TimeStamp() = 0;
+  // Set frame duration (microseconds)
+  // NOTE: next-frame's Timestamp() != this-frame's TimeStamp()+Duration()
+  // depending on rounding to avoid having to track roundoff errors
+  // and dropped/missing frames(!) (which may leave a large gap)
+  virtual void SetDuration(uint64_t aDuration) = 0;
+  virtual uint64_t Duration() const = 0;
+  virtual void SetFrameType(GMPVideoFrameType aFrameType) = 0;
+  virtual GMPVideoFrameType FrameType() = 0;
+  virtual void SetAllocatedSize(uint32_t aNewSize) = 0;
+  virtual uint32_t AllocatedSize() = 0;
+  virtual void SetSize(uint32_t aSize) = 0;
+  virtual uint32_t Size() = 0;
+  virtual void SetCompleteFrame(bool aCompleteFrame) = 0;
+  virtual bool CompleteFrame() = 0;
+  virtual const uint8_t* Buffer() const = 0;
+  virtual uint8_t* Buffer() = 0;
+  virtual GMPBufferType BufferType() const = 0;
+  virtual void SetBufferType(GMPBufferType aBufferType) = 0;
+};
+
+#endif  // GMP_VIDEO_FRAME_ENCODED_h_
diff --git a/dom/media/gmp/gmp-api/gmp-video-frame-i420.h b/dom/media/gmp/gmp-api/gmp-video-frame-i420.h
new file mode 100644
index 0000000000..6899d9c19c
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-video-frame-i420.h
@@ -0,0 +1,134 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_VIDEO_FRAME_I420_h_
+#define GMP_VIDEO_FRAME_I420_h_
+
+#include "gmp-errors.h"
+#include "gmp-video-frame.h"
+#include "gmp-video-plane.h"
+
+#include <stdint.h>
+
+enum GMPPlaneType {
+  kGMPYPlane = 0,
+  kGMPUPlane = 1,
+  kGMPVPlane = 2,
+  kGMPNumOfPlanes = 3
+};
+
+// The implementation backing this interface uses shared memory for the
+// buffer(s). This means it can only be used by the "owning" process.
+// At first the process which created the object owns it. When the object
+// is passed to an interface the creator loses ownership and must Destroy()
+// the object. Further attempts to use it may fail due to not being able to
+// access the underlying buffer(s).
+//
+// Methods that create or destroy shared memory must be called on the main
+// thread. They are marked below.
+class GMPVideoi420Frame : public GMPVideoFrame {
+ public:
+  // MAIN THREAD ONLY
+  // CreateEmptyFrame: Sets frame dimensions and allocates buffers based
+  // on set dimensions - height and plane stride.
+  // If required size is bigger than the allocated one, new buffers of adequate
+  // size will be allocated.
+  virtual GMPErr CreateEmptyFrame(int32_t aWidth, int32_t aHeight,
+                                  int32_t aStride_y, int32_t aStride_u,
+                                  int32_t aStride_v) = 0;
+
+  // MAIN THREAD ONLY
+  // CreateFrame: Sets the frame's members and buffers. If required size is
+  // bigger than allocated one, new buffers of adequate size will be allocated.
+  virtual GMPErr CreateFrame(int32_t aSize_y, const uint8_t* aBuffer_y,
+                             int32_t aSize_u, const uint8_t* aBuffer_u,
+                             int32_t aSize_v, const uint8_t* aBuffer_v,
+                             int32_t aWidth, int32_t aHeight, int32_t aStride_y,
+                             int32_t aStride_u, int32_t aStride_v) = 0;
+
+  // MAIN THREAD ONLY
+  // Copy frame: If required size is bigger than allocated one, new buffers of
+  // adequate size will be allocated.
+  virtual GMPErr CopyFrame(const GMPVideoi420Frame& aVideoFrame) = 0;
+
+  // Swap Frame.
+  virtual void SwapFrame(GMPVideoi420Frame* aVideoFrame) = 0;
+
+  // Get pointer to buffer per plane.
+  virtual uint8_t* Buffer(GMPPlaneType aType) = 0;
+
+  // Overloading with const.
+  virtual const uint8_t* Buffer(GMPPlaneType aType) const = 0;
+
+  // Get allocated size per plane.
+  virtual int32_t AllocatedSize(GMPPlaneType aType) const = 0;
+
+  // Get allocated stride per plane.
+  virtual int32_t Stride(GMPPlaneType aType) const = 0;
+
+  // Set frame width.
+  virtual GMPErr SetWidth(int32_t aWidth) = 0;
+
+  // Set frame height.
+  virtual GMPErr SetHeight(int32_t aHeight) = 0;
+
+  // Get frame width.
+  virtual int32_t Width() const = 0;
+
+  // Get frame height.
+  virtual int32_t Height() const = 0;
+
+  // Set frame timestamp (microseconds)
+  virtual void SetTimestamp(uint64_t aTimestamp) = 0;
+
+  // Get frame timestamp (microseconds)
+  virtual uint64_t Timestamp() const = 0;
+
+  // Set frame duration (microseconds)
+  // NOTE: next-frame's Timestamp() != this-frame's TimeStamp()+Duration()
+  // depending on rounding to avoid having to track roundoff errors
+  // and dropped/missing frames(!) (which may leave a large gap)
+  virtual void SetDuration(uint64_t aDuration) = 0;
+
+  // Get frame duration (microseconds)
+  virtual uint64_t Duration() const = 0;
+
+  // Return true if underlying plane buffers are of zero size, false if not.
+  virtual bool IsZeroSize() const = 0;
+
+  // Reset underlying plane buffers sizes to 0. This function doesn't clear
+  // memory.
+  virtual void ResetSize() = 0;
+};
+
+#endif  // GMP_VIDEO_FRAME_I420_h_
diff --git a/dom/media/gmp/gmp-api/gmp-video-frame.h b/dom/media/gmp/gmp-api/gmp-video-frame.h
new file mode 100644
index 0000000000..8f202e1196
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-video-frame.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_VIDEO_FRAME_h_
+#define GMP_VIDEO_FRAME_h_
+
+#include "gmp-video-plane.h"
+
+enum GMPVideoFrameFormat { kGMPEncodedVideoFrame = 0, kGMPI420VideoFrame = 1 };
+
+class GMPVideoFrame {
+ public:
+  virtual GMPVideoFrameFormat GetFrameFormat() = 0;
+  // MAIN THREAD ONLY IF OWNING PROCESS
+  virtual void Destroy() = 0;
+};
+
+#endif  // GMP_VIDEO_FRAME_h_
diff --git a/dom/media/gmp/gmp-api/gmp-video-host.h b/dom/media/gmp/gmp-api/gmp-video-host.h
new file mode 100644
index 0000000000..e1a6c742aa
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-video-host.h
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_VIDEO_HOST_h_
+#define GMP_VIDEO_HOST_h_
+
+#include "gmp-errors.h"
+#include "gmp-video-frame-i420.h"
+#include "gmp-video-frame-encoded.h"
+#include "gmp-video-codec.h"
+
+// This interface must be called on the main thread only.
+class GMPVideoHost {
+ public:
+  // Construct various video API objects. Host does not retain reference,
+  // caller is owner and responsible for deleting.
+  // MAIN THREAD ONLY
+  virtual GMPErr CreateFrame(GMPVideoFrameFormat aFormat,
+                             GMPVideoFrame** aFrame) = 0;
+  virtual GMPErr CreatePlane(GMPPlane** aPlane) = 0;
+};
+
+#endif  // GMP_VIDEO_HOST_h_
diff --git a/dom/media/gmp/gmp-api/gmp-video-plane.h b/dom/media/gmp/gmp-api/gmp-video-plane.h
new file mode 100644
index 0000000000..58ca1041ca
--- /dev/null
+++ b/dom/media/gmp/gmp-api/gmp-video-plane.h
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* Copyright (c) 2011, The WebRTC project authors. All rights reserved.
+ * Copyright (c) 2014, Mozilla
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ ** Redistributions of source code must retain the above copyright
+ *  notice, this list of conditions and the following disclaimer.
+ *
+ ** Redistributions in binary form must reproduce the above copyright
+ *  notice, this list of conditions and the following disclaimer in
+ *  the documentation and/or other materials provided with the
+ *  distribution.
+ *
+ ** Neither the name of Google nor the names of its contributors may
+ *  be used to endorse or promote products derived from this software
+ *  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GMP_VIDEO_PLANE_h_
+#define GMP_VIDEO_PLANE_h_
+
+#include "gmp-errors.h"
+#include <stdint.h>
+
+// The implementation backing this interface uses shared memory for the
+// buffer(s). This means it can only be used by the "owning" process.
+// At first the process which created the object owns it. When the object
+// is passed to an interface the creator loses ownership and must Destroy()
+// the object. Further attempts to use it may fail due to not being able to
+// access the underlying buffer(s).
+//
+// Methods that create or destroy shared memory must be called on the main
+// thread. They are marked below.
+class GMPPlane {
+ public:
+  // MAIN THREAD ONLY
+  // CreateEmptyPlane - set allocated size, actual plane size and stride:
+  // If current size is smaller than current size, then a buffer of sufficient
+  // size will be allocated.
+  virtual GMPErr CreateEmptyPlane(int32_t aAllocatedSize, int32_t aStride,
+                                  int32_t aPlaneSize) = 0;
+
+  // MAIN THREAD ONLY
+  // Copy the entire plane data.
+  virtual GMPErr Copy(const GMPPlane& aPlane) = 0;
+
+  // MAIN THREAD ONLY
+  // Copy buffer: If current size is smaller
+  // than current size, then a buffer of sufficient size will be allocated.
+  virtual GMPErr Copy(int32_t aSize, int32_t aStride,
+                      const uint8_t* aBuffer) = 0;
+
+  // Swap plane data.
+  virtual void Swap(GMPPlane& aPlane) = 0;
+
+  // Get allocated size.
+  virtual int32_t AllocatedSize() const = 0;
+
+  // Set actual size.
+  virtual void ResetSize() = 0;
+
+  // Return true is plane size is zero, false if not.
+  virtual bool IsZeroSize() const = 0;
+
+  // Get stride value.
+  virtual int32_t Stride() const = 0;
+
+  // Return data pointer.
+  virtual const uint8_t* Buffer() const = 0;
+
+  // Overloading with non-const.
+  virtual uint8_t* Buffer() = 0;
+
+  // MAIN THREAD ONLY IF OWNING PROCESS
+  // Call this when done with the object. This may delete it.
+  virtual void Destroy() = 0;
+};
+
+#endif  // GMP_VIDEO_PLANE_h_
diff --git a/dom/media/gmp/moz.build b/dom/media/gmp/moz.build
new file mode 100644
index 0000000000..046e35cc4b
--- /dev/null
+++ b/dom/media/gmp/moz.build
@@ -0,0 +1,148 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+XPIDL_MODULE = "content_geckomediaplugins"
+
+XPIDL_SOURCES += [
+    "mozIGeckoMediaPluginChromeService.idl",
+    "mozIGeckoMediaPluginService.idl",
+]
+
+EXPORTS += [
+    "ChromiumCDMCallback.h",
+    "ChromiumCDMParent.h",
+    "ChromiumCDMProxy.h",
+    "DecryptJob.h",
+    "gmp-api/gmp-entrypoints.h",
+    "gmp-api/gmp-errors.h",
+    "gmp-api/gmp-platform.h",
+    "gmp-api/gmp-storage.h",
+    "gmp-api/gmp-video-codec.h",
+    "gmp-api/gmp-video-decode.h",
+    "gmp-api/gmp-video-encode.h",
+    "gmp-api/gmp-video-frame-encoded.h",
+    "gmp-api/gmp-video-frame-i420.h",
+    "gmp-api/gmp-video-frame.h",
+    "gmp-api/gmp-video-host.h",
+    "gmp-api/gmp-video-plane.h",
+    "GMPCallbackBase.h",
+    "GMPChild.h",
+    "GMPContentChild.h",
+    "GMPContentParent.h",
+    "GMPCrashHelper.h",
+    "GMPCrashHelperHolder.h",
+    "GMPLoader.h",
+    "GMPMessageUtils.h",
+    "GMPParent.h",
+    "GMPPlatform.h",
+    "GMPProcessChild.h",
+    "GMPProcessParent.h",
+    "GMPSanitizedExports.h",
+    "GMPService.h",
+    "GMPServiceChild.h",
+    "GMPServiceParent.h",
+    "GMPSharedMemManager.h",
+    "GMPStorage.h",
+    "GMPStorageChild.h",
+    "GMPStorageParent.h",
+    "GMPTimerChild.h",
+    "GMPTimerParent.h",
+    "GMPUtils.h",
+    "GMPVideoDecoderChild.h",
+    "GMPVideoDecoderParent.h",
+    "GMPVideoDecoderProxy.h",
+    "GMPVideoEncodedFrameImpl.h",
+    "GMPVideoEncoderChild.h",
+    "GMPVideoEncoderParent.h",
+    "GMPVideoEncoderProxy.h",
+    "GMPVideoHost.h",
+    "GMPVideoi420FrameImpl.h",
+    "GMPVideoPlaneImpl.h",
+    "widevine-adapter/content_decryption_module.h",
+    "widevine-adapter/content_decryption_module_export.h",
+    "widevine-adapter/content_decryption_module_ext.h",
+    "widevine-adapter/content_decryption_module_proxy.h",
+]
+
+UNIFIED_SOURCES += [
+    "CDMStorageIdProvider.cpp",
+    "ChromiumCDMAdapter.cpp",
+    "ChromiumCDMCallbackProxy.cpp",
+    "ChromiumCDMChild.cpp",
+    "ChromiumCDMParent.cpp",
+    "ChromiumCDMProxy.cpp",
+    "DecryptJob.cpp",
+    "GMPChild.cpp",
+    "GMPContentChild.cpp",
+    "GMPContentParent.cpp",
+    "GMPCrashHelperHolder.cpp",
+    "GMPDiskStorage.cpp",
+    "GMPLoader.cpp",
+    "GMPMemoryStorage.cpp",
+    "GMPParent.cpp",
+    "GMPPlatform.cpp",
+    "GMPProcessChild.cpp",
+    "GMPProcessParent.cpp",
+    "GMPService.cpp",
+    "GMPServiceChild.cpp",
+    "GMPServiceParent.cpp",
+    "GMPSharedMemManager.cpp",
+    "GMPStorageChild.cpp",
+    "GMPStorageParent.cpp",
+    "GMPTimerChild.cpp",
+    "GMPTimerParent.cpp",
+    "GMPUtils.cpp",
+    "GMPVideoDecoderChild.cpp",
+    "GMPVideoDecoderParent.cpp",
+    "GMPVideoEncodedFrameImpl.cpp",
+    "GMPVideoEncoderChild.cpp",
+    "GMPVideoEncoderParent.cpp",
+    "GMPVideoHost.cpp",
+    "GMPVideoi420FrameImpl.cpp",
+    "GMPVideoPlaneImpl.cpp",
+]
+
+DIRS += [
+    "rlz",
+    "widevine-adapter",
+]
+
+IPDL_SOURCES += [
+    "GMPTypes.ipdlh",
+    "PChromiumCDM.ipdl",
+    "PGMP.ipdl",
+    "PGMPService.ipdl",
+    "PGMPStorage.ipdl",
+    "PGMPTimer.ipdl",
+    "PGMPVideoDecoder.ipdl",
+    "PGMPVideoEncoder.ipdl",
+]
+
+PREPROCESSED_IPDL_SOURCES += [
+    "PGMPContent.ipdl",
+]
+
+if CONFIG["OS_TARGET"] in ["WINNT", "Darwin"]:
+    DEFINES["SUPPORT_STORAGE_ID"] = 1
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+if CONFIG["MOZ_SANDBOX"]:
+    # For sandbox includes and the include dependencies those have
+    LOCAL_INCLUDES += [
+        "/security/sandbox/chromium",
+        "/security/sandbox/chromium-shim",
+    ]
+
+
+FINAL_LIBRARY = "xul"
+# dom/media/webrtc/transport so we work with --disable-webrtc
+LOCAL_INCLUDES += [
+    "/dom/media/webrtc/transport",
+    "/xpcom/base",
+    "/xpcom/build",
+    "/xpcom/threads",
+]
diff --git a/dom/media/gmp/mozIGeckoMediaPluginChromeService.idl b/dom/media/gmp/mozIGeckoMediaPluginChromeService.idl
new file mode 100644
index 0000000000..51dc545092
--- /dev/null
+++ b/dom/media/gmp/mozIGeckoMediaPluginChromeService.idl
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIFile.idl"
+
+[scriptable, uuid(32d35d21-181f-4630-8caa-a431e2ebad72)]
+interface mozIGeckoMediaPluginChromeService : nsISupports
+{
+  /**
+   * Add a directory to scan for gecko media plugins.
+   * @note Main-thread API.
+   */
+  void addPluginDirectory(in AString directory);
+
+  /**
+   * Remove a directory for gecko media plugins.
+   * @note Main-thread API.
+   */
+  void removePluginDirectory(in AString directory);
+
+  /**
+   * Remove a directory for gecko media plugins and delete it from disk.
+   * If |defer| is true, wait until the plugin is unused before removing.
+   * @note Main-thread API.
+   */
+  void removeAndDeletePluginDirectory(in AString directory,
+                                      [optional] in bool defer);
+
+  /**
+   * Clears storage data associated with the site and the originAttributes
+   * pattern in JSON format.
+   */
+  void forgetThisSite(in AString site,
+                      in AString aPattern);
+
+  /**
+   * Clears storage data associated with the base domain
+   * This means cleaning any storage that is associated
+   * either by origin or top level origin with the base domain
+   */
+  void forgetThisBaseDomain(in AString baseDomain);
+
+  /**
+   * Returns true if the given node id is allowed to store things
+   * persistently on disk. Private Browsing and local content are not
+   * allowed to store persistent data.
+   */
+  bool isPersistentStorageAllowed(in ACString nodeId);
+
+  /**
+   * Returns the directory to use as the base for storing data about GMPs.
+   */
+  nsIFile getStorageDir();
+
+};
diff --git a/dom/media/gmp/mozIGeckoMediaPluginService.idl b/dom/media/gmp/mozIGeckoMediaPluginService.idl
new file mode 100644
index 0000000000..190d4b057d
--- /dev/null
+++ b/dom/media/gmp/mozIGeckoMediaPluginService.idl
@@ -0,0 +1,121 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIThread.idl"
+
+%{C++
+#include "mozilla/UniquePtr.h"
+#include "nsTArray.h"
+#include "nsString.h"
+class GMPDecryptorProxy;
+class GMPVideoDecoderProxy;
+class GMPVideoEncoderProxy;
+class GMPVideoHost;
+
+namespace mozilla {
+class GMPCrashHelper;
+}
+
+template<class T>
+class GMPGetterCallback
+{
+public:
+  GMPGetterCallback() { MOZ_COUNT_CTOR(GMPGetterCallback<T>); }
+  virtual ~GMPGetterCallback() { MOZ_COUNT_DTOR(GMPGetterCallback<T>); }
+  virtual void Done(T*) = 0;
+};
+template<class T>
+class GMPVideoGetterCallback
+{
+public:
+  GMPVideoGetterCallback() { MOZ_COUNT_CTOR(GMPVideoGetterCallback<T>); }
+  virtual ~GMPVideoGetterCallback() { MOZ_COUNT_DTOR(GMPVideoGetterCallback<T>); }
+  virtual void Done(T*, GMPVideoHost*) = 0;
+};
+typedef GMPGetterCallback<GMPDecryptorProxy> GetGMPDecryptorCallback;
+typedef GMPVideoGetterCallback<GMPVideoDecoderProxy> GetGMPVideoDecoderCallback;
+typedef GMPVideoGetterCallback<GMPVideoEncoderProxy> GetGMPVideoEncoderCallback;
+class GetNodeIdCallback
+{
+public:
+  MOZ_COUNTED_DEFAULT_CTOR(GetNodeIdCallback)
+  MOZ_COUNTED_DTOR_VIRTUAL(GetNodeIdCallback)
+  virtual void Done(nsresult aResult, const nsACString& aNodeId) = 0;
+};
+%}
+
+[ptr] native TagArray(nsTArray<nsCString>);
+native GetGMPDecryptorCallback(mozilla::UniquePtr<GetGMPDecryptorCallback>&&);
+native GetGMPVideoDecoderCallback(mozilla::UniquePtr<GetGMPVideoDecoderCallback>&&);
+native GetGMPVideoEncoderCallback(mozilla::UniquePtr<GetGMPVideoEncoderCallback>&&);
+native GetNodeIdCallback(mozilla::UniquePtr<GetNodeIdCallback>&&);
+native GMPCrashHelperPtr(mozilla::GMPCrashHelper*);
+
+[scriptable, uuid(44d362ae-937a-4803-bee6-f2512a0149d1)]
+interface mozIGeckoMediaPluginService : nsISupports
+{
+
+  /**
+   * The GMP thread. Callable from any thread.
+   */
+  readonly attribute nsIThread thread;
+
+  /**
+   * Run through windows registered registered for pluginId, sending
+   * 'PluginCrashed' chrome-only event
+   */
+  void RunPluginCrashCallbacks(in unsigned long pluginId, in ACString pluginName);
+
+  /**
+   * Get a plugin that supports the specified tags.
+   * Callable on any thread
+   */
+  [noscript]
+  boolean hasPluginForAPI(in ACString api, in TagArray tags);
+
+  /**
+   * Get a video decoder that supports the specified tags.
+   * The array of tags should at least contain a codec tag, and optionally
+   * other tags such as for EME keysystem.
+   * Callable only on GMP thread.
+   * This is an asynchronous operation, the Done method of the callback object
+   * will be called on the GMP thread with the result (which might be null in
+   * the case of failure). This method always takes ownership of the callback
+   * object, but if this method returns an error then the Done method of the
+   * callback object will not be called at all.
+   */
+  [noscript]
+  void getGMPVideoDecoder(in GMPCrashHelperPtr helper,
+                          in TagArray tags,
+                          [optional] in ACString nodeId,
+                          in GetGMPVideoDecoderCallback callback);
+
+  /**
+   * Get a video encoder that supports the specified tags.
+   * The array of tags should at least contain a codec tag, and optionally
+   * other tags.
+   * Callable only on GMP thread.
+   * This is an asynchronous operation, the Done method of the callback object
+   * will be called on the GMP thread with the result (which might be null in
+   * the case of failure). This method always takes ownership of the callback
+   * object, but if this method returns an error then the Done method of the
+   * callback object will not be called at all.
+   */
+  [noscript]
+  void getGMPVideoEncoder(in GMPCrashHelperPtr helper,
+                          in TagArray tags,
+                          [optional] in ACString nodeId,
+                          in GetGMPVideoEncoderCallback callback);
+
+  /**
+   * Gets the NodeId for a (origin, urlbarOrigin) pair.
+   */
+  [noscript]
+  void getNodeId(in AString origin,
+                 in AString topLevelOrigin,
+                 in AString gmpName,
+                 in GetNodeIdCallback callback);
+};
diff --git a/dom/media/gmp/rlz/OWNERS b/dom/media/gmp/rlz/OWNERS
new file mode 100644
index 0000000000..66f24ebb37
--- /dev/null
+++ b/dom/media/gmp/rlz/OWNERS
@@ -0,0 +1,4 @@
+rogerta@chromium.org
+thakis@chromium.org
+
+# COMPONENT: Internals>Core
diff --git a/dom/media/gmp/rlz/README.mozilla b/dom/media/gmp/rlz/README.mozilla
new file mode 100644
index 0000000000..4408737a5e
--- /dev/null
+++ b/dom/media/gmp/rlz/README.mozilla
@@ -0,0 +1,4 @@
+Code taken from rlz project in Chromium repository: https://chromium.googlesource.com/chromium/src.git/+/6f3478dfd7d29b9872871718bd08493ed0c8bc8e
+
+Note: base/ contains wrappers/dummies to provide implementations of the
+Chromium APIs that this code relies upon.
diff --git a/dom/media/gmp/rlz/lib/assert.h b/dom/media/gmp/rlz/lib/assert.h
new file mode 100644
index 0000000000..c64dd7ff82
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/assert.h
@@ -0,0 +1,14 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef FAKE_ASSERT_H_
+#define FAKE_ASSERT_H_
+
+#include <assert.h>
+
+#define ASSERT_STRING(x) { assert(false); }
+#define VERIFY(x) { assert(x); };
+
+#endif
diff --git a/dom/media/gmp/rlz/lib/crc8.cc b/dom/media/gmp/rlz/lib/crc8.cc
new file mode 100644
index 0000000000..fe02eabf1b
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/crc8.cc
@@ -0,0 +1,90 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "rlz/lib/crc8.h"
+
+namespace {
+
+// The CRC lookup table used for ATM HES (Polynomial = 0x07).
+// These are 256 unique 8-bit values.
+const unsigned char kCrcTable[256] = {
+  0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
+  0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
+  0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
+  0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
+  0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
+  0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
+  0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
+  0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
+  0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
+  0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
+  0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
+  0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
+  0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
+  0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
+  0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
+  0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
+  0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
+  0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
+  0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
+  0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
+  0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
+  0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
+  0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
+  0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
+  0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
+  0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
+  0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
+  0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
+  0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
+  0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
+  0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
+  0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
+};
+
+}  // namespace anonymous
+
+
+namespace rlz_lib {
+
+bool Crc8::Generate(const unsigned char *data, int length,
+                    unsigned char* check_sum) {
+  if (!check_sum)
+    return false;
+
+  *check_sum = 0;
+  if (!data)
+    return false;
+
+  // The inital and final constants are as used in the ATM HEC.
+  static const unsigned char kInitial = 0x00;
+  static const unsigned char kFinal = 0x55;
+  unsigned char crc = kInitial;
+  for (int i = 0; i < length; ++i) {
+    crc = kCrcTable[(data[i] ^ crc) & 0xFFU];
+  }
+
+  *check_sum =  crc ^ kFinal;
+  return true;
+}
+
+bool Crc8::Verify(const unsigned char* data, int length,
+                  unsigned char check_sum, bool* matches) {
+  if (!matches)
+    return false;
+
+  *matches = false;
+  if (!data)
+    return false;
+
+  unsigned char calculated_crc;
+  if (!Generate(data, length, &calculated_crc))
+    return false;
+
+  *matches = check_sum == calculated_crc;
+
+  return true;
+}
+
+}  // namespace rlz_lib
diff --git a/dom/media/gmp/rlz/lib/crc8.h b/dom/media/gmp/rlz/lib/crc8.h
new file mode 100644
index 0000000000..6c3c84859b
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/crc8.h
@@ -0,0 +1,24 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Crc8 utility functions.
+
+#ifndef RLZ_LIB_CRC8_H_
+#define RLZ_LIB_CRC8_H_
+
+namespace rlz_lib {
+// CRC-8 methods:
+class Crc8 {
+ public:
+  static bool Generate(const unsigned char* data,
+                       int length,
+                       unsigned char* check_sum);
+  static bool Verify(const unsigned char* data,
+                     int length,
+                     unsigned char checksum,
+                     bool * matches);
+};
+};  // namespace rlz_lib
+
+#endif  // RLZ_LIB_CRC8_H_
diff --git a/dom/media/gmp/rlz/lib/machine_id.cc b/dom/media/gmp/rlz/lib/machine_id.cc
new file mode 100644
index 0000000000..b2943f90ff
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/machine_id.cc
@@ -0,0 +1,93 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "rlz/lib/machine_id.h"
+
+#include <stddef.h>
+
+#include "rlz/lib/assert.h"
+#include "rlz/lib/crc8.h"
+#include "rlz/lib/string_utils.h"
+
+// Note: The original machine_id.cc code depends on Chromium's sha1 implementation.
+// Using Mozilla's implmentation as replacement to reduce the dependency of
+// some external files.
+#include "mozilla/SHA1.h"
+
+namespace rlz_lib {
+
+bool GetMachineId(std::string* machine_id) {
+  if (!machine_id)
+    return false;
+
+  static std::string calculated_id;
+  static bool calculated = false;
+  if (calculated) {
+    *machine_id = calculated_id;
+    return true;
+  }
+
+  std::vector<uint8_t> sid_bytes;
+  int volume_id;
+  if (!GetRawMachineId(&sid_bytes, &volume_id))
+    return false;
+
+  if (!testing::GetMachineIdImpl(sid_bytes, volume_id, machine_id))
+    return false;
+
+  calculated = true;
+  calculated_id = *machine_id;
+  return true;
+}
+
+namespace testing {
+
+bool GetMachineIdImpl(const std::vector<uint8_t>& sid_bytes,
+                      int volume_id,
+                      std::string* machine_id) {
+  machine_id->clear();
+
+  // The ID should be the SID hash + the Hard Drive SNo. + checksum byte.
+  static const int kSizeWithoutChecksum = mozilla::SHA1Sum::kHashSize + sizeof(int);
+  std::basic_string<unsigned char> id_binary(kSizeWithoutChecksum + 1, 0);
+
+  if (!sid_bytes.empty()) {
+    // In order to be compatible with the old version of RLZ, the hash of the
+    // SID must be done with all the original bytes from the unicode string.
+    // However, the chromebase SHA1 hash function takes only an std::string as
+    // input, so the unicode string needs to be converted to std::string
+    // "as is".
+    size_t byte_count = sid_bytes.size() * sizeof(std::vector<uint8_t>::value_type);
+    const char* buffer = reinterpret_cast<const char*>(sid_bytes.data());
+
+    // Note that digest can have embedded nulls.
+    mozilla::SHA1Sum SHA1;
+    mozilla::SHA1Sum::Hash hash;
+    SHA1.update(buffer, byte_count);
+    SHA1.finish(hash);
+    std::string digest(reinterpret_cast<char*>(hash), mozilla::SHA1Sum::kHashSize);
+    VERIFY(digest.size() == mozilla::SHA1Sum::kHashSize);
+    std::copy(digest.begin(), digest.end(), id_binary.begin());
+  }
+
+  // Convert from int to binary (makes big-endian).
+  for (size_t i = 0; i < sizeof(int); i++) {
+    int shift_bits = 8 * (sizeof(int) - i - 1);
+    id_binary[mozilla::SHA1Sum::kHashSize + i] = static_cast<unsigned char>(
+        (volume_id >> shift_bits) & 0xFF);
+  }
+
+  // Append the checksum byte.
+  if (!sid_bytes.empty() || (0 != volume_id))
+    rlz_lib::Crc8::Generate(id_binary.c_str(),
+                            kSizeWithoutChecksum,
+                            &id_binary[kSizeWithoutChecksum]);
+
+  return rlz_lib::BytesToString(
+      id_binary.c_str(), kSizeWithoutChecksum + 1, machine_id);
+}
+
+}  // namespace testing
+
+}  // namespace rlz_lib
diff --git a/dom/media/gmp/rlz/lib/machine_id.h b/dom/media/gmp/rlz/lib/machine_id.h
new file mode 100644
index 0000000000..5fa343efa3
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/machine_id.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef RLZ_LIB_MACHINE_ID_H_
+#define RLZ_LIB_MACHINE_ID_H_
+
+#include <string>
+#include <vector>
+
+namespace rlz_lib {
+
+// Gets the unique ID for the machine used for RLZ tracking purposes. On
+// Windows, this ID is derived from the Windows machine SID, and is the string
+// representation of a 20 byte hash + 4 bytes volum id + a 1 byte checksum.
+// Included in financial pings with events, unless explicitly forbidden by the
+// calling application.
+bool GetMachineId(std::string* machine_id);
+
+// Retrieves a raw machine identifier string and a machine-specific
+// 4 byte value. GetMachineId() will SHA1 |data|, append |more_data|, compute
+// the Crc8 of that, and return a hex-encoded string of that data.
+bool GetRawMachineId(std::vector<uint8_t>* data, int* more_data);
+
+namespace testing {
+bool GetMachineIdImpl(const std::vector<uint8_t>& sid_bytes,
+                      int volume_id,
+                      std::string* machine_id);
+}  // namespace testing
+
+}  // namespace rlz_lib
+
+#endif  // RLZ_LIB_MACHINE_ID_H_
diff --git a/dom/media/gmp/rlz/lib/string_utils.cc b/dom/media/gmp/rlz/lib/string_utils.cc
new file mode 100644
index 0000000000..6da7323823
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/string_utils.cc
@@ -0,0 +1,34 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// String manipulation functions used in the RLZ library.
+
+#include "rlz/lib/string_utils.h"
+
+namespace rlz_lib {
+
+bool BytesToString(const unsigned char* data,
+                   int data_len,
+                   std::string* string) {
+  if (!string)
+    return false;
+
+  string->clear();
+  if (data_len < 1 || !data)
+    return false;
+
+  static const char kHex[] = "0123456789ABCDEF";
+
+  // Fix the buffer size to begin with to avoid repeated re-allocation.
+  string->resize(data_len * 2);
+  int index = data_len;
+  while (index--) {
+    string->at(2 * index) = kHex[data[index] >> 4];  // high digit
+    string->at(2 * index + 1) = kHex[data[index] & 0x0F];  // low digit
+  }
+
+  return true;
+}
+
+}  // namespace rlz_lib
diff --git a/dom/media/gmp/rlz/lib/string_utils.h b/dom/media/gmp/rlz/lib/string_utils.h
new file mode 100644
index 0000000000..500133ade1
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/string_utils.h
@@ -0,0 +1,20 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// String manipulation functions used in the RLZ library.
+
+#ifndef RLZ_LIB_STRING_UTILS_H_
+#define RLZ_LIB_STRING_UTILS_H_
+
+#include <string>
+
+namespace rlz_lib {
+
+bool BytesToString(const unsigned char* data,
+                   int data_len,
+                   std::string* string);
+
+};  // namespace
+
+#endif  // RLZ_LIB_STRING_UTILS_H_
diff --git a/dom/media/gmp/rlz/mac/lib/machine_id_mac.cc b/dom/media/gmp/rlz/mac/lib/machine_id_mac.cc
new file mode 100644
index 0000000000..8c0bae22e8
--- /dev/null
+++ b/dom/media/gmp/rlz/mac/lib/machine_id_mac.cc
@@ -0,0 +1,322 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <IOKit/IOKitLib.h>
+#include <IOKit/network/IOEthernetController.h>
+#include <IOKit/network/IOEthernetInterface.h>
+#include <IOKit/network/IONetworkInterface.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include <vector>
+#include <string>
+// Note: The original machine_id_mac.cc code is in namespace rlz_lib below.
+// It depends on some external files, which would bring in a log of Chromium
+// code if imported as well.
+// Instead only the necessary code has been extracted from the relevant files,
+// and further combined and reduced to limit the maintenance burden.
+
+// [Extracted from base/logging.h]
+#define DCHECK assert
+
+namespace base {
+
+// [Extracted from base/mac/scoped_typeref.h and base/mac/scoped_cftyperef.h]
+template<typename T>
+class ScopedCFTypeRef {
+ public:
+  typedef T element_type;
+
+  explicit ScopedCFTypeRef(T object)
+      : object_(object) {
+  }
+
+  ScopedCFTypeRef(const ScopedCFTypeRef<T>& that) = delete;
+  ScopedCFTypeRef(ScopedCFTypeRef<T>&& that) = delete;
+
+  ~ScopedCFTypeRef() {
+    if (object_)
+      CFRelease(object_);
+  }
+
+  ScopedCFTypeRef& operator=(const ScopedCFTypeRef<T>& that) = delete;
+  ScopedCFTypeRef& operator=(ScopedCFTypeRef<T>&& that) = delete;
+
+  operator T() const {
+    return object_;
+  }
+
+  // ScopedCFTypeRef<>::release() is like scoped_ptr<>::release.  It is NOT
+  // a wrapper for CFRelease().
+  T release() {
+    T temp = object_;
+    object_ = NULL;
+    return temp;
+  }
+
+ private:
+  T object_;
+};
+
+namespace mac {
+
+// [Extracted from base/mac/scoped_ioobject.h]
+// Just like ScopedCFTypeRef but for io_object_t and subclasses.
+template<typename IOT>
+class ScopedIOObject {
+ public:
+  typedef IOT element_type;
+
+  explicit ScopedIOObject(IOT object = IO_OBJECT_NULL)
+      : object_(object) {
+  }
+
+  ~ScopedIOObject() {
+    if (object_)
+      IOObjectRelease(object_);
+  }
+
+  ScopedIOObject(const ScopedIOObject&) = delete;
+  void operator=(const ScopedIOObject&) = delete;
+
+  void reset(IOT object = IO_OBJECT_NULL) {
+    if (object_)
+      IOObjectRelease(object_);
+    object_ = object;
+  }
+
+  operator IOT() const {
+    return object_;
+  }
+
+ private:
+  IOT object_;
+};
+
+// [Extracted from base/mac/foundation_util.h]
+template<typename T>
+T CFCast(const CFTypeRef& cf_val);
+
+template<>
+CFDataRef
+CFCast<CFDataRef>(const CFTypeRef& cf_val) {
+  if (cf_val == NULL) {
+    return NULL;
+  }
+  if (CFGetTypeID(cf_val) == CFDataGetTypeID()) {
+    return (CFDataRef)(cf_val);
+  }
+  return NULL;
+}
+
+template<>
+CFStringRef
+CFCast<CFStringRef>(const CFTypeRef& cf_val) {
+  if (cf_val == NULL) {
+    return NULL;
+  }
+  if (CFGetTypeID(cf_val) == CFStringGetTypeID()) {
+    return (CFStringRef)(cf_val);
+  }
+  return NULL;
+}
+
+}  // namespace mac
+
+// [Extracted from base/strings/sys_string_conversions_mac.mm]
+static const CFStringEncoding kNarrowStringEncoding = kCFStringEncodingUTF8;
+
+template<typename StringType>
+static StringType CFStringToSTLStringWithEncodingT(CFStringRef cfstring,
+                                                   CFStringEncoding encoding) {
+  CFIndex length = CFStringGetLength(cfstring);
+  if (length == 0)
+    return StringType();
+
+  CFRange whole_string = CFRangeMake(0, length);
+  CFIndex out_size;
+  CFIndex converted = CFStringGetBytes(cfstring,
+                                       whole_string,
+                                       encoding,
+                                       0,      // lossByte
+                                       false,  // isExternalRepresentation
+                                       NULL,   // buffer
+                                       0,      // maxBufLen
+                                       &out_size);
+  if (converted == 0 || out_size == 0)
+    return StringType();
+
+  // out_size is the number of UInt8-sized units needed in the destination.
+  // A buffer allocated as UInt8 units might not be properly aligned to
+  // contain elements of StringType::value_type.  Use a container for the
+  // proper value_type, and convert out_size by figuring the number of
+  // value_type elements per UInt8.  Leave room for a NUL terminator.
+  typename StringType::size_type elements =
+      out_size * sizeof(UInt8) / sizeof(typename StringType::value_type) + 1;
+
+  std::vector<typename StringType::value_type> out_buffer(elements);
+  converted = CFStringGetBytes(cfstring,
+                               whole_string,
+                               encoding,
+                               0,      // lossByte
+                               false,  // isExternalRepresentation
+                               reinterpret_cast<UInt8*>(&out_buffer[0]),
+                               out_size,
+                               NULL);  // usedBufLen
+  if (converted == 0)
+    return StringType();
+
+  out_buffer[elements - 1] = '\0';
+  return StringType(&out_buffer[0], elements - 1);
+}
+
+std::string SysCFStringRefToUTF8(CFStringRef ref)
+{
+  return CFStringToSTLStringWithEncodingT<std::string>(ref,
+                                                       kNarrowStringEncoding);
+}
+
+} // namespace base
+
+namespace rlz_lib {
+
+namespace {
+
+// See http://developer.apple.com/library/mac/#technotes/tn1103/_index.html
+
+// The caller is responsible for freeing |matching_services|.
+bool FindEthernetInterfaces(io_iterator_t* matching_services) {
+  base::ScopedCFTypeRef<CFMutableDictionaryRef> matching_dict(
+      IOServiceMatching(kIOEthernetInterfaceClass));
+  if (!matching_dict)
+    return false;
+
+  base::ScopedCFTypeRef<CFMutableDictionaryRef> primary_interface(
+      CFDictionaryCreateMutable(kCFAllocatorDefault,
+                                0,
+                                &kCFTypeDictionaryKeyCallBacks,
+                                &kCFTypeDictionaryValueCallBacks));
+  if (!primary_interface)
+    return false;
+
+  CFDictionarySetValue(
+      primary_interface, CFSTR(kIOPrimaryInterface), kCFBooleanTrue);
+  CFDictionarySetValue(
+      matching_dict, CFSTR(kIOPropertyMatchKey), primary_interface);
+
+  kern_return_t kern_result = IOServiceGetMatchingServices(
+      kIOMasterPortDefault, matching_dict.release(), matching_services);
+
+  return kern_result == KERN_SUCCESS;
+}
+
+bool GetMACAddressFromIterator(io_iterator_t primary_interface_iterator,
+                               uint8_t* buffer, size_t buffer_size) {
+  if (buffer_size < kIOEthernetAddressSize)
+    return false;
+
+  bool success = false;
+
+  bzero(buffer, buffer_size);
+  base::mac::ScopedIOObject<io_object_t> primary_interface;
+  for (primary_interface.reset(IOIteratorNext(primary_interface_iterator));
+       primary_interface;
+       primary_interface.reset(IOIteratorNext(primary_interface_iterator))) {
+    io_object_t primary_interface_parent;
+    kern_return_t kern_result = IORegistryEntryGetParentEntry(
+        primary_interface, kIOServicePlane, &primary_interface_parent);
+    base::mac::ScopedIOObject<io_object_t> primary_interface_parent_deleter(
+        primary_interface_parent);
+    success = kern_result == KERN_SUCCESS;
+
+    if (!success)
+      continue;
+
+    base::ScopedCFTypeRef<CFTypeRef> mac_data(
+        IORegistryEntryCreateCFProperty(primary_interface_parent,
+                                        CFSTR(kIOMACAddress),
+                                        kCFAllocatorDefault,
+                                        0));
+    CFDataRef mac_data_data = base::mac::CFCast<CFDataRef>(mac_data);
+    if (mac_data_data) {
+      CFDataGetBytes(
+          mac_data_data, CFRangeMake(0, kIOEthernetAddressSize), buffer);
+    }
+  }
+
+  return success;
+}
+
+bool GetMacAddress(unsigned char* buffer, size_t size) {
+  io_iterator_t primary_interface_iterator;
+  if (!FindEthernetInterfaces(&primary_interface_iterator))
+    return false;
+  bool result = GetMACAddressFromIterator(
+      primary_interface_iterator, buffer, size);
+  IOObjectRelease(primary_interface_iterator);
+  return result;
+}
+
+CFStringRef CopySerialNumber() {
+  base::mac::ScopedIOObject<io_service_t> expert_device(
+      IOServiceGetMatchingService(kIOMasterPortDefault,
+          IOServiceMatching("IOPlatformExpertDevice")));
+  if (!expert_device)
+    return NULL;
+
+  base::ScopedCFTypeRef<CFTypeRef> serial_number(
+      IORegistryEntryCreateCFProperty(expert_device,
+                                      CFSTR(kIOPlatformSerialNumberKey),
+                                      kCFAllocatorDefault,
+                                      0));
+  CFStringRef serial_number_cfstring =
+      base::mac::CFCast<CFStringRef>(serial_number.release());
+  if (!serial_number_cfstring)
+    return NULL;
+
+  return serial_number_cfstring;
+}
+
+}  // namespace
+
+bool GetRawMachineId(std::vector<uint8_t>* data, int* more_data) {
+  uint8_t mac_address[kIOEthernetAddressSize];
+
+  std::string id;
+  if (GetMacAddress(mac_address, sizeof(mac_address))) {
+    id += "mac:";
+    static const char hex[] =
+      { '0', '1', '2', '3', '4', '5', '6', '7',
+        '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
+    for (int i = 0; i < kIOEthernetAddressSize; ++i) {
+      uint8_t byte = mac_address[i];
+      id += hex[byte >> 4];
+      id += hex[byte & 0xF];
+    }
+  }
+
+  // A MAC address is enough to uniquely identify a machine, but it's only 6
+  // bytes, 3 of which are manufacturer-determined. To make brute-forcing the
+  // SHA1 of this harder, also append the system's serial number.
+  CFStringRef serial = CopySerialNumber();
+  if (serial) {
+    if (!id.empty()) {
+      id += ' ';
+    }
+    id += "serial:";
+    id += base::SysCFStringRefToUTF8(serial);
+    CFRelease(serial);
+  }
+
+  // Get the contents of the string 'id' as a bunch of bytes.
+  data->assign(&id[0], &id[id.size()]);
+
+  // On windows, this is set to the volume id. Since it's not scrambled before
+  // being sent, just set it to 1.
+  *more_data = 1;
+  return true;
+}
+
+}  // namespace rlz_lib
diff --git a/dom/media/gmp/rlz/moz.build b/dom/media/gmp/rlz/moz.build
new file mode 100644
index 0000000000..8e2d9ea5d1
--- /dev/null
+++ b/dom/media/gmp/rlz/moz.build
@@ -0,0 +1,34 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Note: build rlz in its own moz.build, so it doesn't pickup any of
+# Chromium IPC's headers used in the moz.build of the parent file.
+
+FINAL_LIBRARY = 'xul'
+
+if CONFIG['OS_TARGET'] in ['WINNT', 'Darwin']:
+    UNIFIED_SOURCES += [
+        'lib/crc8.cc',
+        'lib/machine_id.cc',
+        'lib/string_utils.cc',
+    ]
+
+if CONFIG['OS_TARGET'] == 'WINNT':
+    UNIFIED_SOURCES += [
+        'win/lib/machine_id_win.cc',
+    ]
+
+if CONFIG['OS_TARGET'] == 'Darwin':
+    UNIFIED_SOURCES += [
+        'mac/lib/machine_id_mac.cc',
+    ]
+    OS_LIBS += [
+        '-framework IOKit',
+    ]
+
+LOCAL_INCLUDES += [
+    '..',
+]
diff --git a/dom/media/gmp/rlz/win/lib/machine_id_win.cc b/dom/media/gmp/rlz/win/lib/machine_id_win.cc
new file mode 100644
index 0000000000..85f1d6cf54
--- /dev/null
+++ b/dom/media/gmp/rlz/win/lib/machine_id_win.cc
@@ -0,0 +1,136 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <windows.h>
+#include <sddl.h>  // For ConvertSidToStringSidW.
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "mozilla/ArrayUtils.h"
+
+#include "rlz/lib/assert.h"
+
+namespace rlz_lib {
+
+namespace {
+
+bool GetSystemVolumeSerialNumber(int* number) {
+  if (!number)
+    return false;
+
+  *number = 0;
+
+  // Find the system root path (e.g: C:\).
+  wchar_t system_path[MAX_PATH + 1];
+  if (!GetSystemDirectoryW(system_path, MAX_PATH))
+    return false;
+
+  wchar_t* first_slash = wcspbrk(system_path, L"\\/");
+  if (first_slash != NULL)
+    *(first_slash + 1) = 0;
+
+  DWORD number_local = 0;
+  if (!GetVolumeInformationW(system_path, NULL, 0, &number_local, NULL, NULL,
+                             NULL, 0))
+    return false;
+
+  *number = (int)number_local;
+  return true;
+}
+
+bool GetComputerSid(const wchar_t* account_name, SID* sid, DWORD sid_size) {
+  static const DWORD kStartDomainLength = 128;  // reasonable to start with
+
+  std::unique_ptr<wchar_t[]> domain_buffer(new wchar_t[kStartDomainLength]);
+  DWORD domain_size = kStartDomainLength;
+  DWORD sid_dword_size = sid_size;
+  SID_NAME_USE sid_name_use;
+
+  BOOL success = ::LookupAccountNameW(NULL, account_name, sid,
+                                      &sid_dword_size, domain_buffer.get(),
+                                      &domain_size, &sid_name_use);
+  if (!success && ::GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
+    // We could have gotten the insufficient buffer error because
+    // one or both of sid and szDomain was too small. Check for that
+    // here.
+    if (sid_dword_size > sid_size)
+      return false;
+
+    if (domain_size > kStartDomainLength)
+      domain_buffer.reset(new wchar_t[domain_size]);
+
+    success = ::LookupAccountNameW(NULL, account_name, sid, &sid_dword_size,
+                                   domain_buffer.get(), &domain_size,
+                                   &sid_name_use);
+  }
+
+  return success != FALSE;
+}
+
+std::vector<uint8_t> ConvertSidToBytes(SID* sid) {
+  std::wstring sid_string;
+#if _WIN32_WINNT >= 0x500
+  wchar_t* sid_buffer = NULL;
+  if (ConvertSidToStringSidW(sid, &sid_buffer)) {
+    sid_string = sid_buffer;
+    LocalFree(sid_buffer);
+  }
+#else
+  SID_IDENTIFIER_AUTHORITY* sia = ::GetSidIdentifierAuthority(sid);
+
+  if(sia->Value[0] || sia->Value[1]) {
+    base::SStringPrintf(
+        &sid_string, L"S-%d-0x%02hx%02hx%02hx%02hx%02hx%02hx",
+        SID_REVISION, (USHORT)sia->Value[0], (USHORT)sia->Value[1],
+        (USHORT)sia->Value[2], (USHORT)sia->Value[3], (USHORT)sia->Value[4],
+        (USHORT)sia->Value[5]);
+  } else {
+    ULONG authority = 0;
+    for (int i = 2; i < 6; ++i) {
+      authority <<= 8;
+      authority |= sia->Value[i];
+    }
+    base::SStringPrintf(&sid_string, L"S-%d-%lu", SID_REVISION, authority);
+  }
+
+  int sub_auth_count = *::GetSidSubAuthorityCount(sid);
+  for(int i = 0; i < sub_auth_count; ++i)
+    base::StringAppendF(&sid_string, L"-%lu", *::GetSidSubAuthority(sid, i));
+#endif
+
+  // Get the contents of the string as a bunch of bytes.
+  return std::vector<uint8_t>(
+           reinterpret_cast<uint8_t*>(&sid_string[0]),
+           reinterpret_cast<uint8_t*>(&sid_string[sid_string.size()]));
+}
+
+}  // namespace
+
+bool GetRawMachineId(std::vector<uint8_t>* sid_bytes, int* volume_id) {
+  // Calculate the Windows SID.
+
+  wchar_t computer_name[MAX_COMPUTERNAME_LENGTH + 1] = {0};
+  DWORD size = mozilla::ArrayLength(computer_name);
+
+  if (GetComputerNameW(computer_name, &size)) {
+    char sid_buffer[SECURITY_MAX_SID_SIZE];
+    SID* sid = reinterpret_cast<SID*>(sid_buffer);
+    if (GetComputerSid(computer_name, sid, SECURITY_MAX_SID_SIZE)) {
+      *sid_bytes = ConvertSidToBytes(sid);
+    }
+  }
+
+  // Get the system drive volume serial number.
+  *volume_id = 0;
+  if (!GetSystemVolumeSerialNumber(volume_id)) {
+    ASSERT_STRING("GetMachineId: Failed to retrieve volume serial number");
+    *volume_id = 0;
+  }
+
+  return true;
+}
+
+}  // namespace rlz_lib
diff --git a/dom/media/gmp/widevine-adapter/WidevineFileIO.cpp b/dom/media/gmp/widevine-adapter/WidevineFileIO.cpp
new file mode 100644
index 0000000000..913f6ba288
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/WidevineFileIO.cpp
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WidevineFileIO.h"
+#include "GMPLog.h"
+#include "WidevineUtils.h"
+
+#include "gmp-api/gmp-platform.h"
+
+// Declared in ChromiumCDMAdapter.cpp.
+extern const GMPPlatformAPI* sPlatform;
+
+namespace mozilla {
+
+void WidevineFileIO::Open(const char* aFilename, uint32_t aFilenameLength) {
+  mName = std::string(aFilename, aFilename + aFilenameLength);
+  GMPRecord* record = nullptr;
+  GMPErr err = sPlatform->createrecord(aFilename, aFilenameLength, &record,
+                                       static_cast<GMPRecordClient*>(this));
+  if (GMP_FAILED(err)) {
+    GMP_LOG_DEBUG("WidevineFileIO::Open() '%s' GMPCreateRecord failed",
+                  mName.c_str());
+    mClient->OnOpenComplete(cdm::FileIOClient::Status::kError);
+    return;
+  }
+  if (GMP_FAILED(record->Open())) {
+    GMP_LOG_DEBUG("WidevineFileIO::Open() '%s' record open failed",
+                  mName.c_str());
+    mClient->OnOpenComplete(cdm::FileIOClient::Status::kError);
+    return;
+  }
+
+  GMP_LOG_DEBUG("WidevineFileIO::Open() '%s'", mName.c_str());
+  mRecord = record;
+}
+
+void WidevineFileIO::Read() {
+  if (!mRecord) {
+    GMP_LOG_DEBUG("WidevineFileIO::Read() '%s' used uninitialized!",
+                  mName.c_str());
+    mClient->OnReadComplete(cdm::FileIOClient::Status::kError, nullptr, 0);
+    return;
+  }
+  GMP_LOG_DEBUG("WidevineFileIO::Read() '%s'", mName.c_str());
+  mRecord->Read();
+}
+
+void WidevineFileIO::Write(const uint8_t* aData, uint32_t aDataSize) {
+  if (!mRecord) {
+    GMP_LOG_DEBUG("WidevineFileIO::Write() '%s' used uninitialized!",
+                  mName.c_str());
+    mClient->OnWriteComplete(cdm::FileIOClient::Status::kError);
+    return;
+  }
+  mRecord->Write(aData, aDataSize);
+}
+
+void WidevineFileIO::Close() {
+  GMP_LOG_DEBUG("WidevineFileIO::Close() '%s'", mName.c_str());
+  if (mRecord) {
+    mRecord->Close();
+    mRecord = nullptr;
+  }
+  delete this;
+}
+
+static cdm::FileIOClient::Status GMPToWidevineFileStatus(GMPErr aStatus) {
+  switch (aStatus) {
+    case GMPRecordInUse:
+      return cdm::FileIOClient::Status::kInUse;
+    case GMPNoErr:
+      return cdm::FileIOClient::Status::kSuccess;
+    default:
+      return cdm::FileIOClient::Status::kError;
+  }
+}
+
+void WidevineFileIO::OpenComplete(GMPErr aStatus) {
+  GMP_LOG_DEBUG("WidevineFileIO::OpenComplete() '%s' status=%d", mName.c_str(),
+                aStatus);
+  mClient->OnOpenComplete(GMPToWidevineFileStatus(aStatus));
+}
+
+void WidevineFileIO::ReadComplete(GMPErr aStatus, const uint8_t* aData,
+                                  uint32_t aDataSize) {
+  GMP_LOG_DEBUG("WidevineFileIO::OnReadComplete() '%s' status=%d",
+                mName.c_str(), aStatus);
+  mClient->OnReadComplete(GMPToWidevineFileStatus(aStatus), aData, aDataSize);
+}
+
+void WidevineFileIO::WriteComplete(GMPErr aStatus) {
+  GMP_LOG_DEBUG("WidevineFileIO::WriteComplete() '%s' status=%d", mName.c_str(),
+                aStatus);
+  mClient->OnWriteComplete(GMPToWidevineFileStatus(aStatus));
+}
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/widevine-adapter/WidevineFileIO.h b/dom/media/gmp/widevine-adapter/WidevineFileIO.h
new file mode 100644
index 0000000000..8c36f032be
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/WidevineFileIO.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef WidevineFileIO_h_
+#define WidevineFileIO_h_
+
+#include <stddef.h>
+#include "content_decryption_module.h"
+#include "gmp-api/gmp-storage.h"
+#include <string>
+
+namespace mozilla {
+
+class WidevineFileIO : public cdm::FileIO, public GMPRecordClient {
+ public:
+  explicit WidevineFileIO(cdm::FileIOClient* aClient)
+      : mClient(aClient), mRecord(nullptr) {}
+
+  // cdm::FileIO
+  void Open(const char* aFilename, uint32_t aFilenameLength) override;
+  void Read() override;
+  void Write(const uint8_t* aData, uint32_t aDataSize) override;
+  void Close() override;
+
+  // GMPRecordClient
+  void OpenComplete(GMPErr aStatus) override;
+  void ReadComplete(GMPErr aStatus, const uint8_t* aData,
+                    uint32_t aDataSize) override;
+  void WriteComplete(GMPErr aStatus) override;
+
+ private:
+  cdm::FileIOClient* mClient;
+  GMPRecord* mRecord;
+  std::string mName;
+};
+
+}  // namespace mozilla
+
+#endif  // WidevineFileIO_h_
diff --git a/dom/media/gmp/widevine-adapter/WidevineUtils.cpp b/dom/media/gmp/widevine-adapter/WidevineUtils.cpp
new file mode 100644
index 0000000000..d0551406b2
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/WidevineUtils.cpp
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WidevineUtils.h"
+#include "GMPLog.h"
+#include "gmp-api/gmp-errors.h"
+#include <stdarg.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+namespace mozilla {
+
+WidevineBuffer::WidevineBuffer(size_t aSize) {
+  GMP_LOG_DEBUG("WidevineBuffer(size=%zu) created", aSize);
+  mBuffer.SetLength(aSize);
+}
+
+WidevineBuffer::~WidevineBuffer() {
+  GMP_LOG_DEBUG("WidevineBuffer(size=%" PRIu32 ") destroyed", Size());
+}
+
+void WidevineBuffer::Destroy() { delete this; }
+
+uint32_t WidevineBuffer::Capacity() const { return mBuffer.Length(); }
+
+uint8_t* WidevineBuffer::Data() { return mBuffer.Elements(); }
+
+void WidevineBuffer::SetSize(uint32_t aSize) { mBuffer.SetLength(aSize); }
+
+uint32_t WidevineBuffer::Size() const { return mBuffer.Length(); }
+
+nsTArray<uint8_t> WidevineBuffer::ExtractBuffer() {
+  nsTArray<uint8_t> out = std::move(mBuffer);
+  return out;
+}
+
+WidevineDecryptedBlock::WidevineDecryptedBlock()
+    : mBuffer(nullptr), mTimestamp(0) {}
+
+WidevineDecryptedBlock::~WidevineDecryptedBlock() {
+  if (mBuffer) {
+    mBuffer->Destroy();
+    mBuffer = nullptr;
+  }
+}
+
+void WidevineDecryptedBlock::SetDecryptedBuffer(cdm::Buffer* aBuffer) {
+  mBuffer = aBuffer;
+}
+
+cdm::Buffer* WidevineDecryptedBlock::DecryptedBuffer() { return mBuffer; }
+
+void WidevineDecryptedBlock::SetTimestamp(int64_t aTimestamp) {
+  mTimestamp = aTimestamp;
+}
+
+int64_t WidevineDecryptedBlock::Timestamp() const { return mTimestamp; }
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/widevine-adapter/WidevineUtils.h b/dom/media/gmp/widevine-adapter/WidevineUtils.h
new file mode 100644
index 0000000000..1502621451
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/WidevineUtils.h
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef WidevineUtils_h_
+#define WidevineUtils_h_
+
+#include "stddef.h"
+#include "content_decryption_module.h"
+#include "nsISupportsImpl.h"
+#include "nsTArray.h"
+#include "mozilla/Logging.h"
+
+namespace mozilla {
+
+#define ENSURE_TRUE(condition, rv)                                   \
+  {                                                                  \
+    if (!(condition)) {                                              \
+      GMP_LOG_DEBUG("ENSURE_TRUE FAILED %s:%d", __FILE__, __LINE__); \
+      return rv;                                                     \
+    }                                                                \
+  }
+
+#define ENSURE_GMP_SUCCESS(err, rv)                                         \
+  {                                                                         \
+    if (GMP_FAILED(err)) {                                                  \
+      GMP_LOG_DEBUG("ENSURE_GMP_SUCCESS FAILED %s:%d", __FILE__, __LINE__); \
+      return rv;                                                            \
+    }                                                                       \
+  }
+
+namespace gmp {
+class CDMShmemBuffer;
+}
+class WidevineBuffer;
+
+// Base class for our cdm::Buffer implementations, so we can tell at runtime
+// whether the buffer is a Shmem or non-Shmem buffer.
+class CDMBuffer : public cdm::Buffer {
+ public:
+  virtual WidevineBuffer* AsArrayBuffer() { return nullptr; }
+  virtual gmp::CDMShmemBuffer* AsShmemBuffer() { return nullptr; }
+};
+
+class WidevineBuffer : public CDMBuffer {
+ public:
+  explicit WidevineBuffer(size_t aSize);
+  ~WidevineBuffer() override;
+  void Destroy() override;
+  uint32_t Capacity() const override;
+  uint8_t* Data() override;
+  void SetSize(uint32_t aSize) override;
+  uint32_t Size() const override;
+
+  // Moves contents of buffer out into temporary.
+  // Note: This empties the buffer.
+  nsTArray<uint8_t> ExtractBuffer();
+
+  WidevineBuffer* AsArrayBuffer() override { return this; }
+
+ private:
+  nsTArray<uint8_t> mBuffer;
+  WidevineBuffer(const WidevineBuffer&);
+  void operator=(const WidevineBuffer&);
+};
+
+class WidevineDecryptedBlock : public cdm::DecryptedBlock {
+ public:
+  WidevineDecryptedBlock();
+  ~WidevineDecryptedBlock() override;
+  void SetDecryptedBuffer(cdm::Buffer* aBuffer) override;
+  cdm::Buffer* DecryptedBuffer() override;
+  void SetTimestamp(int64_t aTimestamp) override;
+  int64_t Timestamp() const override;
+
+ private:
+  cdm::Buffer* mBuffer;
+  int64_t mTimestamp;
+};
+
+}  // namespace mozilla
+
+#endif  // WidevineUtils_h_
diff --git a/dom/media/gmp/widevine-adapter/WidevineVideoFrame.cpp b/dom/media/gmp/widevine-adapter/WidevineVideoFrame.cpp
new file mode 100644
index 0000000000..8eec94c21d
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/WidevineVideoFrame.cpp
@@ -0,0 +1,136 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WidevineVideoFrame.h"
+#include "GMPLog.h"
+#include "WidevineUtils.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/IntegerPrintfMacros.h"
+
+namespace mozilla {
+
+WidevineVideoFrame::WidevineVideoFrame()
+    : mFormat(cdm::VideoFormat::kUnknownVideoFormat),
+      mSize{0, 0},
+      mBuffer(nullptr),
+      mTimestamp(0) {
+  MOZ_ASSERT(mSize.height == 0 && mSize.width == 0, "Size should be zeroed");
+  GMP_LOG_DEBUG("WidevineVideoFrame::WidevineVideoFrame() this=%p", this);
+  memset(mPlaneOffsets, 0, sizeof(mPlaneOffsets));
+  memset(mPlaneStrides, 0, sizeof(mPlaneStrides));
+}
+
+WidevineVideoFrame::WidevineVideoFrame(WidevineVideoFrame&& aOther)
+    : mFormat(aOther.mFormat),
+      mSize(aOther.mSize),
+      mBuffer(aOther.mBuffer),
+      mTimestamp(aOther.mTimestamp) {
+  GMP_LOG_DEBUG(
+      "WidevineVideoFrame::WidevineVideoFrame(WidevineVideoFrame&&) "
+      "this=%p, other=%p",
+      this, &aOther);
+  memcpy(mPlaneOffsets, aOther.mPlaneOffsets, sizeof(mPlaneOffsets));
+  memcpy(mPlaneStrides, aOther.mPlaneStrides, sizeof(mPlaneStrides));
+  aOther.mBuffer = nullptr;
+}
+
+WidevineVideoFrame::~WidevineVideoFrame() {
+  if (mBuffer) {
+    mBuffer->Destroy();
+    mBuffer = nullptr;
+  }
+}
+
+void WidevineVideoFrame::SetFormat(cdm::VideoFormat aFormat) {
+  GMP_LOG_DEBUG("WidevineVideoFrame::SetFormat(%d) this=%p", aFormat, this);
+  mFormat = aFormat;
+}
+
+cdm::VideoFormat WidevineVideoFrame::Format() const { return mFormat; }
+
+void WidevineVideoFrame::SetSize(cdm::Size aSize) {
+  GMP_LOG_DEBUG("WidevineVideoFrame::SetSize(%d,%d) this=%p", aSize.width,
+                aSize.height, this);
+  mSize.width = aSize.width;
+  mSize.height = aSize.height;
+}
+
+cdm::Size WidevineVideoFrame::Size() const { return mSize; }
+
+void WidevineVideoFrame::SetFrameBuffer(cdm::Buffer* aFrameBuffer) {
+  GMP_LOG_DEBUG("WidevineVideoFrame::SetFrameBuffer(%p) this=%p", aFrameBuffer,
+                this);
+  MOZ_ASSERT(!mBuffer);
+  mBuffer = aFrameBuffer;
+}
+
+cdm::Buffer* WidevineVideoFrame::FrameBuffer() { return mBuffer; }
+
+void WidevineVideoFrame::SetPlaneOffset(cdm::VideoPlane aPlane,
+                                        uint32_t aOffset) {
+  GMP_LOG_DEBUG("WidevineVideoFrame::SetPlaneOffset(%d, %" PRIu32 ") this=%p",
+                aPlane, aOffset, this);
+  mPlaneOffsets[aPlane] = aOffset;
+}
+
+uint32_t WidevineVideoFrame::PlaneOffset(cdm::VideoPlane aPlane) {
+  return mPlaneOffsets[aPlane];
+}
+
+void WidevineVideoFrame::SetStride(cdm::VideoPlane aPlane, uint32_t aStride) {
+  GMP_LOG_DEBUG("WidevineVideoFrame::SetStride(%d, %" PRIu32 ") this=%p",
+                aPlane, aStride, this);
+  mPlaneStrides[aPlane] = aStride;
+}
+
+uint32_t WidevineVideoFrame::Stride(cdm::VideoPlane aPlane) {
+  return mPlaneStrides[aPlane];
+}
+
+void WidevineVideoFrame::SetTimestamp(int64_t timestamp) {
+  GMP_LOG_DEBUG("WidevineVideoFrame::SetTimestamp(%" PRId64 ") this=%p",
+                timestamp, this);
+  mTimestamp = timestamp;
+}
+
+int64_t WidevineVideoFrame::Timestamp() const { return mTimestamp; }
+
+bool WidevineVideoFrame::InitToBlack(int32_t aWidth, int32_t aHeight,
+                                     int64_t aTimeStamp) {
+  MOZ_ASSERT(aWidth >= 0 && aHeight >= 0,
+             "Frame dimensions should be positive");
+  CheckedInt<size_t> ySizeChk = aWidth;
+  ySizeChk *= aHeight;
+  // If w*h didn't overflow, half of them won't.
+  const size_t uSize = ((aWidth + 1) / 2) * ((aHeight + 1) / 2);
+  CheckedInt<size_t> yuSizeChk = ySizeChk + uSize;
+  if (!yuSizeChk.isValid()) {
+    return false;
+  }
+  WidevineBuffer* buffer = new WidevineBuffer(yuSizeChk.value());
+  const size_t& ySize = ySizeChk.value();
+  // Black in YCbCr is (0,128,128).
+  memset(buffer->Data(), 0, ySize);
+  memset(buffer->Data() + ySize, 128, uSize);
+  if (mBuffer) {
+    mBuffer->Destroy();
+    mBuffer = nullptr;
+  }
+  SetFormat(cdm::VideoFormat::kI420);
+  SetSize(cdm::Size{aWidth, aHeight});
+  SetFrameBuffer(buffer);
+  SetPlaneOffset(cdm::VideoPlane::kYPlane, 0);
+  SetStride(cdm::VideoPlane::kYPlane, aWidth);
+  // Note: U and V planes are stored at the same place in order to
+  // save memory since their contents are the same.
+  SetPlaneOffset(cdm::VideoPlane::kUPlane, ySize);
+  SetStride(cdm::VideoPlane::kUPlane, (aWidth + 1) / 2);
+  SetPlaneOffset(cdm::VideoPlane::kVPlane, ySize);
+  SetStride(cdm::VideoPlane::kVPlane, (aWidth + 1) / 2);
+  SetTimestamp(aTimeStamp);
+  return true;
+}
+
+}  // namespace mozilla
diff --git a/dom/media/gmp/widevine-adapter/WidevineVideoFrame.h b/dom/media/gmp/widevine-adapter/WidevineVideoFrame.h
new file mode 100644
index 0000000000..0ae65ac1e5
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/WidevineVideoFrame.h
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef WidevineVideoFrame_h_
+#define WidevineVideoFrame_h_
+
+#include "stddef.h"
+#include "content_decryption_module.h"
+#include "mozilla/Attributes.h"
+#include <vector>
+
+namespace mozilla {
+
+class WidevineVideoFrame : public cdm::VideoFrame {
+ public:
+  WidevineVideoFrame();
+  WidevineVideoFrame(WidevineVideoFrame&& other);
+  ~WidevineVideoFrame();
+
+  void SetFormat(cdm::VideoFormat aFormat) override;
+  cdm::VideoFormat Format() const override;
+
+  void SetSize(cdm::Size aSize) override;
+  cdm::Size Size() const override;
+
+  void SetFrameBuffer(cdm::Buffer* aFrameBuffer) override;
+  cdm::Buffer* FrameBuffer() override;
+
+  void SetPlaneOffset(cdm::VideoPlane aPlane, uint32_t aOffset) override;
+  uint32_t PlaneOffset(cdm::VideoPlane aPlane) override;
+
+  void SetStride(cdm::VideoPlane aPlane, uint32_t aStride) override;
+  uint32_t Stride(cdm::VideoPlane aPlane) override;
+
+  void SetTimestamp(int64_t aTimestamp) override;
+  int64_t Timestamp() const override;
+
+  [[nodiscard]] bool InitToBlack(int32_t aWidth, int32_t aHeight,
+                                 int64_t aTimeStamp);
+
+ protected:
+  cdm::VideoFormat mFormat;
+  cdm::Size mSize;
+  cdm::Buffer* mBuffer;
+  uint32_t mPlaneOffsets[cdm::VideoPlane::kMaxPlanes];
+  uint32_t mPlaneStrides[cdm::VideoPlane::kMaxPlanes];
+  int64_t mTimestamp;
+};
+
+}  // namespace mozilla
+
+#endif
diff --git a/dom/media/gmp/widevine-adapter/content_decryption_module.h b/dom/media/gmp/widevine-adapter/content_decryption_module.h
new file mode 100644
index 0000000000..68fee35195
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/content_decryption_module.h
@@ -0,0 +1,1359 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CDM_CONTENT_DECRYPTION_MODULE_H_
+#define CDM_CONTENT_DECRYPTION_MODULE_H_
+
+#include <type_traits>
+
+#include "content_decryption_module_export.h"
+#include "content_decryption_module_proxy.h"
+
+#if defined(_MSC_VER)
+typedef unsigned char uint8_t;
+typedef unsigned int uint32_t;
+typedef int int32_t;
+typedef __int64 int64_t;
+#else
+#  include <stdint.h>
+#endif
+
+// The version number must be rolled when the exported functions are updated!
+// If the CDM and the adapter use different versions of these functions, the
+// adapter will fail to load or crash!
+#define CDM_MODULE_VERSION 4
+
+// Build the versioned entrypoint name.
+// The extra macros are necessary to expand version to an actual value.
+#define INITIALIZE_CDM_MODULE \
+  BUILD_ENTRYPOINT(InitializeCdmModule, CDM_MODULE_VERSION)
+#define BUILD_ENTRYPOINT(name, version) \
+  BUILD_ENTRYPOINT_NO_EXPANSION(name, version)
+#define BUILD_ENTRYPOINT_NO_EXPANSION(name, version) name##_##version
+
+// Macro to check that |type| does the following:
+// 1. is a standard layout.
+// 2. is trivial.
+// 3. sizeof(type) matches the expected size in bytes. As some types contain
+//    pointers, the size is specified for both 32 and 64 bit.
+#define CHECK_TYPE(type, size_32, size_64)                           \
+  static_assert(std::is_standard_layout<type>(),                     \
+                #type " not standard_layout");                       \
+  static_assert(std::is_trivial<type>(), #type " not trivial");      \
+  static_assert((sizeof(void*) == 4 && sizeof(type) == size_32) ||   \
+                    (sizeof(void*) == 8 && sizeof(type) == size_64), \
+                #type " size mismatch")
+
+extern "C" {
+
+CDM_API void INITIALIZE_CDM_MODULE();
+
+CDM_API void DeinitializeCdmModule();
+
+// Returns a pointer to the requested CDM Host interface upon success.
+// Returns NULL if the requested CDM Host interface is not supported.
+// The caller should cast the returned pointer to the type matching
+// |host_interface_version|.
+typedef void* (*GetCdmHostFunc)(int host_interface_version, void* user_data);
+
+// Returns a pointer to the requested CDM upon success.
+// Returns NULL if an error occurs or the requested |cdm_interface_version| or
+// |key_system| is not supported or another error occurs.
+// The caller should cast the returned pointer to the type matching
+// |cdm_interface_version|.
+// Caller retains ownership of arguments and must call Destroy() on the returned
+// object.
+CDM_API void* CreateCdmInstance(int cdm_interface_version,
+                                const char* key_system,
+                                uint32_t key_system_size,
+                                GetCdmHostFunc get_cdm_host_func,
+                                void* user_data);
+
+CDM_API const char* GetCdmVersion();
+
+}  // extern "C"
+
+namespace cdm {
+
+enum Status : uint32_t {
+  kSuccess = 0,
+  kNeedMoreData,  // Decoder needs more data to produce a decoded frame/sample.
+  kNoKey,         // The required decryption key is not available.
+  kInitializationError,    // Initialization error.
+  kDecryptError,           // Decryption failed.
+  kDecodeError,            // Error decoding audio or video.
+  kDeferredInitialization  // Decoder is not ready for initialization.
+};
+CHECK_TYPE(Status, 4, 4);
+
+// Exceptions used by the CDM to reject promises.
+// https://w3c.github.io/encrypted-media/#exceptions
+enum Exception : uint32_t {
+  kExceptionTypeError,
+  kExceptionNotSupportedError,
+  kExceptionInvalidStateError,
+  kExceptionQuotaExceededError
+};
+CHECK_TYPE(Exception, 4, 4);
+
+// The encryption scheme. The definitions are from ISO/IEC 23001-7:2016.
+enum class EncryptionScheme : uint32_t {
+  kUnencrypted = 0,
+  kCenc,  // 'cenc' subsample encryption using AES-CTR mode.
+  kCbcs   // 'cbcs' pattern encryption using AES-CBC mode.
+};
+CHECK_TYPE(EncryptionScheme, 4, 4);
+
+// The pattern used for pattern encryption. Note that ISO/IEC 23001-7:2016
+// defines each block to be 16-bytes.
+struct Pattern {
+  uint32_t crypt_byte_block;  // Count of the encrypted blocks.
+  uint32_t skip_byte_block;   // Count of the unencrypted blocks.
+};
+CHECK_TYPE(Pattern, 8, 8);
+
+enum class ColorRange : uint8_t {
+  kInvalid,
+  kLimited,  // 709 color range with RGB values ranging from 16 to 235.
+  kFull,     // Full RGB color range with RGB values from 0 to 255.
+  kDerived   // Range is defined by |transfer_id| and |matrix_id|.
+};
+CHECK_TYPE(ColorRange, 1, 1);
+
+// Described in ISO 23001-8:2016, section 7. All the IDs are in the range
+// [0, 255] so 8-bit integer is sufficient. An unspecified ColorSpace should be
+// {2, 2, 2, ColorRange::kInvalid}, where value 2 means "Unspecified" for all
+// the IDs, as defined by the spec.
+struct ColorSpace {
+  uint8_t primary_id;   // 7.1 colour primaries, table 2
+  uint8_t transfer_id;  // 7.2 transfer characteristics, table 3
+  uint8_t matrix_id;    // 7.3 matrix coefficients, table 4
+  ColorRange range;
+};
+CHECK_TYPE(ColorSpace, 4, 4);
+
+// Time is defined as the number of seconds since the Epoch
+// (00:00:00 UTC, January 1, 1970), not including any added leap second.
+// Also see Time definition in spec: https://w3c.github.io/encrypted-media/#time
+// Note that Time is defined in millisecond accuracy in the spec but in second
+// accuracy here.
+typedef double Time;
+
+// An input buffer can be split into several continuous subsamples.
+// A SubsampleEntry specifies the number of clear and cipher bytes in each
+// subsample. For example, the following buffer has three subsamples:
+//
+// |<----- subsample1 ----->|<----- subsample2 ----->|<----- subsample3 ----->|
+// |   clear1   |  cipher1  |  clear2  |   cipher2   | clear3 |    cipher3    |
+//
+// For decryption, all of the cipher bytes in a buffer should be concatenated
+// (in the subsample order) into a single logical stream. The clear bytes should
+// not be considered as part of decryption.
+//
+// Stream to decrypt:   |  cipher1  |   cipher2   |    cipher3    |
+// Decrypted stream:    | decrypted1|  decrypted2 |   decrypted3  |
+//
+// After decryption, the decrypted bytes should be copied over the position
+// of the corresponding cipher bytes in the original buffer to form the output
+// buffer. Following the above example, the decrypted buffer should be:
+//
+// |<----- subsample1 ----->|<----- subsample2 ----->|<----- subsample3 ----->|
+// |   clear1   | decrypted1|  clear2  |  decrypted2 | clear3 |   decrypted3  |
+//
+struct SubsampleEntry {
+  uint32_t clear_bytes;
+  uint32_t cipher_bytes;
+};
+CHECK_TYPE(SubsampleEntry, 8, 8);
+
+// Represents an input buffer to be decrypted (and possibly decoded). It does
+// not own any pointers in this struct. If |encryption_scheme| = kUnencrypted,
+// the data is unencrypted.
+// Note that this struct is organized so that sizeof(InputBuffer_2)
+// equals the sum of sizeof() all members in both 32-bit and 64-bit compiles.
+// Padding has been added to keep the fields aligned.
+struct InputBuffer_2 {
+  const uint8_t* data;  // Pointer to the beginning of the input data.
+  uint32_t data_size;   // Size (in bytes) of |data|.
+
+  EncryptionScheme encryption_scheme;
+
+  const uint8_t* key_id;  // Key ID to identify the decryption key.
+  uint32_t key_id_size;   // Size (in bytes) of |key_id|.
+  uint32_t : 32;          // Padding.
+
+  const uint8_t* iv;  // Initialization vector.
+  uint32_t iv_size;   // Size (in bytes) of |iv|.
+  uint32_t : 32;      // Padding.
+
+  const struct SubsampleEntry* subsamples;
+  uint32_t num_subsamples;  // Number of subsamples in |subsamples|.
+  uint32_t : 32;            // Padding.
+
+  // |pattern| is required if |encryption_scheme| specifies pattern encryption.
+  Pattern pattern;
+
+  int64_t timestamp;  // Presentation timestamp in microseconds.
+};
+CHECK_TYPE(InputBuffer_2, 64, 80);
+
+enum AudioCodec : uint32_t { kUnknownAudioCodec = 0, kCodecVorbis, kCodecAac };
+CHECK_TYPE(AudioCodec, 4, 4);
+
+struct AudioDecoderConfig_2 {
+  AudioCodec codec;
+  int32_t channel_count;
+  int32_t bits_per_channel;
+  int32_t samples_per_second;
+
+  // Optional byte data required to initialize audio decoders, such as the
+  // vorbis setup header.
+  uint8_t* extra_data;
+  uint32_t extra_data_size;
+
+  // Encryption scheme.
+  EncryptionScheme encryption_scheme;
+};
+CHECK_TYPE(AudioDecoderConfig_2, 28, 32);
+
+// Supported sample formats for AudioFrames.
+enum AudioFormat : uint32_t {
+  kUnknownAudioFormat = 0,  // Unknown format value. Used for error reporting.
+  kAudioFormatU8,           // Interleaved unsigned 8-bit w/ bias of 128.
+  kAudioFormatS16,          // Interleaved signed 16-bit.
+  kAudioFormatS32,          // Interleaved signed 32-bit.
+  kAudioFormatF32,          // Interleaved float 32-bit.
+  kAudioFormatPlanarS16,    // Signed 16-bit planar.
+  kAudioFormatPlanarF32,    // Float 32-bit planar.
+};
+CHECK_TYPE(AudioFormat, 4, 4);
+
+// Surface formats based on FOURCC labels, see: http://www.fourcc.org/yuv.php
+// Values are chosen to be consistent with Chromium's VideoPixelFormat values.
+enum VideoFormat : uint32_t {
+  kUnknownVideoFormat = 0,  // Unknown format value. Used for error reporting.
+  kYv12 = 1,                // 12bpp YVU planar 1x1 Y, 2x2 VU samples.
+  kI420 = 2,                // 12bpp YUV planar 1x1 Y, 2x2 UV samples.
+
+  // In the following formats, each sample uses 16-bit in storage, while the
+  // sample value is stored in the least significant N bits where N is
+  // specified by the number after "P". For example, for YUV420P9, each Y, U,
+  // and V sample is stored in the least significant 9 bits in a 2-byte block.
+  kYUV420P9 = 16,
+  kYUV420P10 = 17,
+  kYUV422P9 = 18,
+  kYUV422P10 = 19,
+  kYUV444P9 = 20,
+  kYUV444P10 = 21,
+  kYUV420P12 = 22,
+  kYUV422P12 = 23,
+  kYUV444P12 = 24,
+};
+CHECK_TYPE(VideoFormat, 4, 4);
+
+struct Size {
+  int32_t width;
+  int32_t height;
+};
+CHECK_TYPE(Size, 8, 8);
+
+enum VideoCodec : uint32_t {
+  kUnknownVideoCodec = 0,
+  kCodecVp8,
+  kCodecH264,
+  kCodecVp9,
+  kCodecAv1
+};
+CHECK_TYPE(VideoCodec, 4, 4);
+
+enum VideoCodecProfile : uint32_t {
+  kUnknownVideoCodecProfile = 0,
+  kProfileNotNeeded,
+  kH264ProfileBaseline,
+  kH264ProfileMain,
+  kH264ProfileExtended,
+  kH264ProfileHigh,
+  kH264ProfileHigh10,
+  kH264ProfileHigh422,
+  kH264ProfileHigh444Predictive,
+  kVP9Profile0,
+  kVP9Profile1,
+  kVP9Profile2,
+  kVP9Profile3,
+  kAv1ProfileMain,
+  kAv1ProfileHigh,
+  kAv1ProfilePro
+};
+CHECK_TYPE(VideoCodecProfile, 4, 4);
+
+// Deprecated: New CDM implementations should use VideoDecoderConfig_3.
+// Note that this struct is organized so that sizeof(VideoDecoderConfig_2)
+// equals the sum of sizeof() all members in both 32-bit and 64-bit compiles.
+// Padding has been added to keep the fields aligned.
+struct VideoDecoderConfig_2 {
+  VideoCodec codec;
+  VideoCodecProfile profile;
+  VideoFormat format;
+  uint32_t : 32;  // Padding.
+
+  // Width and height of video frame immediately post-decode. Not all pixels
+  // in this region are valid.
+  Size coded_size;
+
+  // Optional byte data required to initialize video decoders, such as H.264
+  // AAVC data.
+  uint8_t* extra_data;
+  uint32_t extra_data_size;
+
+  // Encryption scheme.
+  EncryptionScheme encryption_scheme;
+};
+CHECK_TYPE(VideoDecoderConfig_2, 36, 40);
+
+struct VideoDecoderConfig_3 {
+  VideoCodec codec;
+  VideoCodecProfile profile;
+  VideoFormat format;
+  ColorSpace color_space;
+
+  // Width and height of video frame immediately post-decode. Not all pixels
+  // in this region are valid.
+  Size coded_size;
+
+  // Optional byte data required to initialize video decoders, such as H.264
+  // AAVC data.
+  uint8_t* extra_data;
+  uint32_t extra_data_size;
+
+  EncryptionScheme encryption_scheme;
+};
+CHECK_TYPE(VideoDecoderConfig_3, 36, 40);
+
+enum StreamType : uint32_t { kStreamTypeAudio = 0, kStreamTypeVideo = 1 };
+CHECK_TYPE(StreamType, 4, 4);
+
+// Structure provided to ContentDecryptionModule::OnPlatformChallengeResponse()
+// after a platform challenge was initiated via Host::SendPlatformChallenge().
+// All values will be NULL / zero in the event of a challenge failure.
+struct PlatformChallengeResponse {
+  // |challenge| provided during Host::SendPlatformChallenge() combined with
+  // nonce data and signed with the platform's private key.
+  const uint8_t* signed_data;
+  uint32_t signed_data_length;
+
+  // RSASSA-PKCS1-v1_5-SHA256 signature of the |signed_data| block.
+  const uint8_t* signed_data_signature;
+  uint32_t signed_data_signature_length;
+
+  // X.509 device specific certificate for the |service_id| requested.
+  const uint8_t* platform_key_certificate;
+  uint32_t platform_key_certificate_length;
+};
+CHECK_TYPE(PlatformChallengeResponse, 24, 48);
+
+// The current status of the associated key. The valid types are defined in the
+// spec: https://w3c.github.io/encrypted-media/#dom-mediakeystatus
+enum KeyStatus : uint32_t {
+  kUsable = 0,
+  kInternalError = 1,
+  kExpired = 2,
+  kOutputRestricted = 3,
+  kOutputDownscaled = 4,
+  kStatusPending = 5,
+  kReleased = 6
+};
+CHECK_TYPE(KeyStatus, 4, 4);
+
+// Used when passing arrays of key information. Does not own the referenced
+// data. |system_code| is an additional error code for unusable keys and
+// should be 0 when |status| == kUsable.
+struct KeyInformation {
+  const uint8_t* key_id;
+  uint32_t key_id_size;
+  KeyStatus status;
+  uint32_t system_code;
+};
+CHECK_TYPE(KeyInformation, 16, 24);
+
+// Supported output protection methods for use with EnableOutputProtection() and
+// returned by OnQueryOutputProtectionStatus().
+enum OutputProtectionMethods : uint32_t {
+  kProtectionNone = 0,
+  kProtectionHDCP = 1 << 0
+};
+CHECK_TYPE(OutputProtectionMethods, 4, 4);
+
+// Connected output link types returned by OnQueryOutputProtectionStatus().
+enum OutputLinkTypes : uint32_t {
+  kLinkTypeNone = 0,
+  kLinkTypeUnknown = 1 << 0,
+  kLinkTypeInternal = 1 << 1,
+  kLinkTypeVGA = 1 << 2,
+  kLinkTypeHDMI = 1 << 3,
+  kLinkTypeDVI = 1 << 4,
+  kLinkTypeDisplayPort = 1 << 5,
+  kLinkTypeNetwork = 1 << 6
+};
+CHECK_TYPE(OutputLinkTypes, 4, 4);
+
+// Result of the QueryOutputProtectionStatus() call.
+enum QueryResult : uint32_t { kQuerySucceeded = 0, kQueryFailed };
+CHECK_TYPE(QueryResult, 4, 4);
+
+// The Initialization Data Type. The valid types are defined in the spec:
+// https://w3c.github.io/encrypted-media/format-registry/initdata/index.html#registry
+enum InitDataType : uint32_t { kCenc = 0, kKeyIds = 1, kWebM = 2 };
+CHECK_TYPE(InitDataType, 4, 4);
+
+// The type of session to create. The valid types are defined in the spec:
+// https://w3c.github.io/encrypted-media/#dom-mediakeysessiontype
+enum SessionType : uint32_t {
+  kTemporary = 0,
+  kPersistentLicense = 1,
+  kPersistentUsageRecord = 2
+};
+CHECK_TYPE(SessionType, 4, 4);
+
+// The type of the message event.  The valid types are defined in the spec:
+// https://w3c.github.io/encrypted-media/#dom-mediakeymessagetype
+enum MessageType : uint32_t {
+  kLicenseRequest = 0,
+  kLicenseRenewal = 1,
+  kLicenseRelease = 2,
+  kIndividualizationRequest = 3
+};
+CHECK_TYPE(MessageType, 4, 4);
+
+enum HdcpVersion : uint32_t {
+  kHdcpVersionNone,
+  kHdcpVersion1_0,
+  kHdcpVersion1_1,
+  kHdcpVersion1_2,
+  kHdcpVersion1_3,
+  kHdcpVersion1_4,
+  kHdcpVersion2_0,
+  kHdcpVersion2_1,
+  kHdcpVersion2_2,
+  kHdcpVersion2_3
+};
+CHECK_TYPE(HdcpVersion, 4, 4);
+
+struct Policy {
+  HdcpVersion min_hdcp_version;
+};
+CHECK_TYPE(Policy, 4, 4);
+
+// Represents a buffer created by Allocator implementations.
+class CDM_CLASS_API Buffer {
+ public:
+  // Destroys the buffer in the same context as it was created.
+  virtual void Destroy() = 0;
+
+  virtual uint32_t Capacity() const = 0;
+  virtual uint8_t* Data() = 0;
+  virtual void SetSize(uint32_t size) = 0;
+  virtual uint32_t Size() const = 0;
+
+ protected:
+  Buffer() {}
+  virtual ~Buffer() {}
+
+ private:
+  Buffer(const Buffer&);
+  void operator=(const Buffer&);
+};
+
+// Represents a decrypted block that has not been decoded.
+class CDM_CLASS_API DecryptedBlock {
+ public:
+  virtual void SetDecryptedBuffer(Buffer* buffer) = 0;
+  virtual Buffer* DecryptedBuffer() = 0;
+
+  // TODO(tomfinegan): Figure out if timestamp is really needed. If it is not,
+  // we can just pass Buffer pointers around.
+  virtual void SetTimestamp(int64_t timestamp) = 0;
+  virtual int64_t Timestamp() const = 0;
+
+ protected:
+  DecryptedBlock() {}
+  virtual ~DecryptedBlock() {}
+};
+
+enum VideoPlane : uint32_t {
+  kYPlane = 0,
+  kUPlane = 1,
+  kVPlane = 2,
+  kMaxPlanes = 3,
+};
+CHECK_TYPE(VideoPlane, 4, 4);
+
+class CDM_CLASS_API VideoFrame {
+ public:
+  virtual void SetFormat(VideoFormat format) = 0;
+  virtual VideoFormat Format() const = 0;
+
+  virtual void SetSize(cdm::Size size) = 0;
+  virtual cdm::Size Size() const = 0;
+
+  virtual void SetFrameBuffer(Buffer* frame_buffer) = 0;
+  virtual Buffer* FrameBuffer() = 0;
+
+  virtual void SetPlaneOffset(VideoPlane plane, uint32_t offset) = 0;
+  virtual uint32_t PlaneOffset(VideoPlane plane) = 0;
+
+  virtual void SetStride(VideoPlane plane, uint32_t stride) = 0;
+  virtual uint32_t Stride(VideoPlane plane) = 0;
+
+  // Sets and gets the presentation timestamp which is in microseconds.
+  virtual void SetTimestamp(int64_t timestamp) = 0;
+  virtual int64_t Timestamp() const = 0;
+
+ protected:
+  VideoFrame() {}
+  virtual ~VideoFrame() {}
+};
+
+// Represents a decoded video frame. The CDM should call the interface methods
+// to set the frame attributes. See DecryptAndDecodeFrame().
+class CDM_CLASS_API VideoFrame_2 {
+ public:
+  virtual void SetFormat(VideoFormat format) = 0;
+  virtual void SetSize(cdm::Size size) = 0;
+  virtual void SetFrameBuffer(Buffer* frame_buffer) = 0;
+  virtual void SetPlaneOffset(VideoPlane plane, uint32_t offset) = 0;
+  virtual void SetStride(VideoPlane plane, uint32_t stride) = 0;
+  // Sets the presentation timestamp which is in microseconds.
+  virtual void SetTimestamp(int64_t timestamp) = 0;
+  virtual void SetColorSpace(ColorSpace color_space) = 0;
+
+ protected:
+  VideoFrame_2() {}
+  virtual ~VideoFrame_2() {}
+};
+
+// Represents decrypted and decoded audio frames. AudioFrames can contain
+// multiple audio output buffers, which are serialized into this format:
+//
+// |<------------------- serialized audio buffer ------------------->|
+// | int64_t timestamp | int64_t length | length bytes of audio data |
+//
+// For example, with three audio output buffers, the AudioFrames will look
+// like this:
+//
+// |<----------------- AudioFrames ------------------>|
+// | audio buffer 0 | audio buffer 1 | audio buffer 2 |
+class CDM_CLASS_API AudioFrames {
+ public:
+  virtual void SetFrameBuffer(Buffer* buffer) = 0;
+  virtual Buffer* FrameBuffer() = 0;
+
+  // The CDM must call this method, providing a valid format, when providing
+  // frame buffers. Planar data should be stored end to end; e.g.,
+  // |ch1 sample1||ch1 sample2|....|ch1 sample_last||ch2 sample1|...
+  virtual void SetFormat(AudioFormat format) = 0;
+  virtual AudioFormat Format() const = 0;
+
+ protected:
+  AudioFrames() {}
+  virtual ~AudioFrames() {}
+};
+
+// FileIO interface provides a way for the CDM to store data in a file in
+// persistent storage. This interface aims only at providing basic read/write
+// capabilities and should not be used as a full fledged file IO API.
+// Each CDM and origin (e.g. HTTPS, "foo.example.com", 443) combination has
+// its own persistent storage. All instances of a given CDM associated with a
+// given origin share the same persistent storage.
+// Note to implementors of this interface:
+// Per-origin storage and the ability for users to clear it are important.
+// See http://www.w3.org/TR/encrypted-media/#privacy-storedinfo.
+class CDM_CLASS_API FileIO {
+ public:
+  // Opens the file with |file_name| for read and write.
+  // FileIOClient::OnOpenComplete() will be called after the opening
+  // operation finishes.
+  // - When the file is opened by a CDM instance, it will be classified as "in
+  //   use". In this case other CDM instances in the same domain may receive
+  //   kInUse status when trying to open it.
+  // - |file_name| must only contain letters (A-Za-z), digits(0-9), or "._-".
+  //   It must not start with an underscore ('_'), and must be at least 1
+  //   character and no more than 256 characters long.
+  virtual void Open(const char* file_name, uint32_t file_name_size) = 0;
+
+  // Reads the contents of the file. FileIOClient::OnReadComplete() will be
+  // called with the read status. Read() should not be called if a previous
+  // Read() or Write() call is still pending; otherwise OnReadComplete() will
+  // be called with kInUse.
+  virtual void Read() = 0;
+
+  // Writes |data_size| bytes of |data| into the file.
+  // FileIOClient::OnWriteComplete() will be called with the write status.
+  // All existing contents in the file will be overwritten. Calling Write() with
+  // NULL |data| will clear all contents in the file. Write() should not be
+  // called if a previous Write() or Read() call is still pending; otherwise
+  // OnWriteComplete() will be called with kInUse.
+  virtual void Write(const uint8_t* data, uint32_t data_size) = 0;
+
+  // Closes the file if opened, destroys this FileIO object and releases any
+  // resources allocated. The CDM must call this method when it finished using
+  // this object. A FileIO object must not be used after Close() is called.
+  virtual void Close() = 0;
+
+ protected:
+  FileIO() {}
+  virtual ~FileIO() {}
+};
+
+// Responses to FileIO calls. All responses will be called asynchronously.
+// When kError is returned, the FileIO object could be in an error state. All
+// following calls (other than Close()) could return kError. The CDM should
+// still call Close() to destroy the FileIO object.
+class CDM_CLASS_API FileIOClient {
+ public:
+  enum class Status : uint32_t { kSuccess = 0, kInUse, kError };
+
+  // Response to a FileIO::Open() call with the open |status|.
+  virtual void OnOpenComplete(Status status) = 0;
+
+  // Response to a FileIO::Read() call to provide |data_size| bytes of |data|
+  // read from the file.
+  // - kSuccess indicates that all contents of the file has been successfully
+  //   read. In this case, 0 |data_size| means that the file is empty.
+  // - kInUse indicates that there are other read/write operations pending.
+  // - kError indicates read failure, e.g. the storage is not open or cannot be
+  //   fully read.
+  virtual void OnReadComplete(Status status, const uint8_t* data,
+                              uint32_t data_size) = 0;
+
+  // Response to a FileIO::Write() call.
+  // - kSuccess indicates that all the data has been written into the file
+  //   successfully.
+  // - kInUse indicates that there are other read/write operations pending.
+  // - kError indicates write failure, e.g. the storage is not open or cannot be
+  //   fully written. Upon write failure, the contents of the file should be
+  //   regarded as corrupt and should not used.
+  virtual void OnWriteComplete(Status status) = 0;
+
+ protected:
+  FileIOClient() {}
+  virtual ~FileIOClient() {}
+};
+
+class CDM_CLASS_API Host_10;
+class CDM_CLASS_API Host_11;
+
+// ContentDecryptionModule interface that all CDMs need to implement.
+// The interface is versioned for backward compatibility.
+// Note: ContentDecryptionModule implementations must use the allocator
+// provided in CreateCdmInstance() to allocate any Buffer that needs to
+// be passed back to the caller. Implementations must call Buffer::Destroy()
+// when a Buffer is created that will never be returned to the caller.
+class CDM_CLASS_API ContentDecryptionModule_10 {
+ public:
+  static const int kVersion = 10;
+  static const bool kIsStable = true;
+  typedef Host_10 Host;
+
+  // Initializes the CDM instance, providing information about permitted
+  // functionalities. The CDM must respond by calling Host::OnInitialized()
+  // with whether the initialization succeeded. No other calls will be made by
+  // the host before Host::OnInitialized() returns.
+  // If |allow_distinctive_identifier| is false, messages from the CDM,
+  // such as message events, must not contain a Distinctive Identifier,
+  // even in an encrypted form.
+  // If |allow_persistent_state| is false, the CDM must not attempt to
+  // persist state. Calls to CreateFileIO() will fail.
+  // If |use_hw_secure_codecs| is true, the CDM must ensure the decryption key
+  // and video buffers (compressed and uncompressed) are securely protected by
+  // hardware.
+  virtual void Initialize(bool allow_distinctive_identifier,
+                          bool allow_persistent_state,
+                          bool use_hw_secure_codecs) = 0;
+
+  // Gets the key status if the CDM has a hypothetical key with the |policy|.
+  // The CDM must respond by calling either Host::OnResolveKeyStatusPromise()
+  // with the result key status or Host::OnRejectPromise() if an unexpected
+  // error happened or this method is not supported.
+  virtual void GetStatusForPolicy(uint32_t promise_id,
+                                  const Policy& policy) = 0;
+
+  // SetServerCertificate(), CreateSessionAndGenerateRequest(), LoadSession(),
+  // UpdateSession(), CloseSession(), and RemoveSession() all accept a
+  // |promise_id|, which must be passed to the completion Host method
+  // (e.g. Host::OnResolveNewSessionPromise()).
+
+  // Provides a server certificate to be used to encrypt messages to the
+  // license server. The CDM must respond by calling either
+  // Host::OnResolvePromise() or Host::OnRejectPromise().
+  // If the CDM does not support server certificates, the promise should be
+  // rejected with kExceptionNotSupportedError. If |server_certificate_data|
+  // is empty, reject with kExceptionTypeError. Any other error should be
+  // rejected with kExceptionInvalidStateError or kExceptionQuotaExceededError.
+  // TODO(crbug.com/796417): Add support for the promise to return true or
+  // false, rather than using kExceptionNotSupportedError to mean false.
+  virtual void SetServerCertificate(uint32_t promise_id,
+                                    const uint8_t* server_certificate_data,
+                                    uint32_t server_certificate_data_size) = 0;
+
+  // Creates a session given |session_type|, |init_data_type|, and |init_data|.
+  // The CDM must respond by calling either Host::OnResolveNewSessionPromise()
+  // or Host::OnRejectPromise().
+  virtual void CreateSessionAndGenerateRequest(uint32_t promise_id,
+                                               SessionType session_type,
+                                               InitDataType init_data_type,
+                                               const uint8_t* init_data,
+                                               uint32_t init_data_size) = 0;
+
+  // Loads the session of type |session_type| specified by |session_id|.
+  // The CDM must respond by calling either Host::OnResolveNewSessionPromise()
+  // or Host::OnRejectPromise(). If the session is not found, call
+  // Host::OnResolveNewSessionPromise() with session_id = NULL.
+  virtual void LoadSession(uint32_t promise_id, SessionType session_type,
+                           const char* session_id,
+                           uint32_t session_id_size) = 0;
+
+  // Updates the session with |response|. The CDM must respond by calling
+  // either Host::OnResolvePromise() or Host::OnRejectPromise().
+  virtual void UpdateSession(uint32_t promise_id, const char* session_id,
+                             uint32_t session_id_size, const uint8_t* response,
+                             uint32_t response_size) = 0;
+
+  // Requests that the CDM close the session. The CDM must respond by calling
+  // either Host::OnResolvePromise() or Host::OnRejectPromise() when the request
+  // has been processed. This may be before the session is closed. Once the
+  // session is closed, Host::OnSessionClosed() must also be called.
+  virtual void CloseSession(uint32_t promise_id, const char* session_id,
+                            uint32_t session_id_size) = 0;
+
+  // Removes any stored session data associated with this session. Will only be
+  // called for persistent sessions. The CDM must respond by calling either
+  // Host::OnResolvePromise() or Host::OnRejectPromise() when the request has
+  // been processed.
+  virtual void RemoveSession(uint32_t promise_id, const char* session_id,
+                             uint32_t session_id_size) = 0;
+
+  // Performs scheduled operation with |context| when the timer fires.
+  virtual void TimerExpired(void* context) = 0;
+
+  // Decrypts the |encrypted_buffer|.
+  //
+  // Returns kSuccess if decryption succeeded, in which case the callee
+  // should have filled the |decrypted_buffer| and passed the ownership of
+  // |data| in |decrypted_buffer| to the caller.
+  // Returns kNoKey if the CDM did not have the necessary decryption key
+  // to decrypt.
+  // Returns kDecryptError if any other error happened.
+  // If the return value is not kSuccess, |decrypted_buffer| should be ignored
+  // by the caller.
+  virtual Status Decrypt(const InputBuffer_2& encrypted_buffer,
+                         DecryptedBlock* decrypted_buffer) = 0;
+
+  // Initializes the CDM audio decoder with |audio_decoder_config|. This
+  // function must be called before DecryptAndDecodeSamples() is called.
+  //
+  // Returns kSuccess if the |audio_decoder_config| is supported and the CDM
+  // audio decoder is successfully initialized.
+  // Returns kInitializationError if |audio_decoder_config| is not supported.
+  // The CDM may still be able to do Decrypt().
+  // Returns kDeferredInitialization if the CDM is not ready to initialize the
+  // decoder at this time. Must call Host::OnDeferredInitializationDone() once
+  // initialization is complete.
+  virtual Status InitializeAudioDecoder(
+      const AudioDecoderConfig_2& audio_decoder_config) = 0;
+
+  // Initializes the CDM video decoder with |video_decoder_config|. This
+  // function must be called before DecryptAndDecodeFrame() is called.
+  //
+  // Returns kSuccess if the |video_decoder_config| is supported and the CDM
+  // video decoder is successfully initialized.
+  // Returns kInitializationError if |video_decoder_config| is not supported.
+  // The CDM may still be able to do Decrypt().
+  // Returns kDeferredInitialization if the CDM is not ready to initialize the
+  // decoder at this time. Must call Host::OnDeferredInitializationDone() once
+  // initialization is complete.
+  virtual Status InitializeVideoDecoder(
+      const VideoDecoderConfig_2& video_decoder_config) = 0;
+
+  // De-initializes the CDM decoder and sets it to an uninitialized state. The
+  // caller can initialize the decoder again after this call to re-initialize
+  // it. This can be used to reconfigure the decoder if the configuration
+  // changes.
+  virtual void DeinitializeDecoder(StreamType decoder_type) = 0;
+
+  // Resets the CDM decoder to an initialized clean state. All internal buffers
+  // MUST be flushed.
+  virtual void ResetDecoder(StreamType decoder_type) = 0;
+
+  // Decrypts the |encrypted_buffer| and decodes the decrypted buffer into a
+  // |video_frame|. Upon end-of-stream, the caller should call this function
+  // repeatedly with empty |encrypted_buffer| (|data| == NULL) until
+  // kNeedMoreData is returned.
+  //
+  // Returns kSuccess if decryption and decoding both succeeded, in which case
+  // the callee will have filled the |video_frame| and passed the ownership of
+  // |frame_buffer| in |video_frame| to the caller.
+  // Returns kNoKey if the CDM did not have the necessary decryption key
+  // to decrypt.
+  // Returns kNeedMoreData if more data was needed by the decoder to generate
+  // a decoded frame (e.g. during initialization and end-of-stream).
+  // Returns kDecryptError if any decryption error happened.
+  // Returns kDecodeError if any decoding error happened.
+  // If the return value is not kSuccess, |video_frame| should be ignored by
+  // the caller.
+  virtual Status DecryptAndDecodeFrame(const InputBuffer_2& encrypted_buffer,
+                                       VideoFrame* video_frame) = 0;
+
+  // Decrypts the |encrypted_buffer| and decodes the decrypted buffer into
+  // |audio_frames|. Upon end-of-stream, the caller should call this function
+  // repeatedly with empty |encrypted_buffer| (|data| == NULL) until only empty
+  // |audio_frames| is produced.
+  //
+  // Returns kSuccess if decryption and decoding both succeeded, in which case
+  // the callee will have filled |audio_frames| and passed the ownership of
+  // |data| in |audio_frames| to the caller.
+  // Returns kNoKey if the CDM did not have the necessary decryption key
+  // to decrypt.
+  // Returns kNeedMoreData if more data was needed by the decoder to generate
+  // audio samples (e.g. during initialization and end-of-stream).
+  // Returns kDecryptError if any decryption error happened.
+  // Returns kDecodeError if any decoding error happened.
+  // If the return value is not kSuccess, |audio_frames| should be ignored by
+  // the caller.
+  virtual Status DecryptAndDecodeSamples(const InputBuffer_2& encrypted_buffer,
+                                         AudioFrames* audio_frames) = 0;
+
+  // Called by the host after a platform challenge was initiated via
+  // Host::SendPlatformChallenge().
+  virtual void OnPlatformChallengeResponse(
+      const PlatformChallengeResponse& response) = 0;
+
+  // Called by the host after a call to Host::QueryOutputProtectionStatus(). The
+  // |link_mask| is a bit mask of OutputLinkTypes and |output_protection_mask|
+  // is a bit mask of OutputProtectionMethods. If |result| is kQueryFailed,
+  // then |link_mask| and |output_protection_mask| are undefined and should
+  // be ignored.
+  virtual void OnQueryOutputProtectionStatus(
+      QueryResult result, uint32_t link_mask,
+      uint32_t output_protection_mask) = 0;
+
+  // Called by the host after a call to Host::RequestStorageId(). If the
+  // version of the storage ID requested is available, |storage_id| and
+  // |storage_id_size| are set appropriately. |version| will be the same as
+  // what was requested, unless 0 (latest) was requested, in which case
+  // |version| will be the actual version number for the |storage_id| returned.
+  // If the requested version is not available, null/zero will be provided as
+  // |storage_id| and |storage_id_size|, respectively, and |version| should be
+  // ignored.
+  virtual void OnStorageId(uint32_t version, const uint8_t* storage_id,
+                           uint32_t storage_id_size) = 0;
+
+  // Destroys the object in the same context as it was created.
+  virtual void Destroy() = 0;
+
+ protected:
+  ContentDecryptionModule_10() {}
+  virtual ~ContentDecryptionModule_10() {}
+};
+
+// ----- Note: CDM interface(s) below still in development and not stable! -----
+
+// ContentDecryptionModule interface that all CDMs need to implement.
+// The interface is versioned for backward compatibility.
+// Note: ContentDecryptionModule implementations must use the allocator
+// provided in CreateCdmInstance() to allocate any Buffer that needs to
+// be passed back to the caller. Implementations must call Buffer::Destroy()
+// when a Buffer is created that will never be returned to the caller.
+class CDM_CLASS_API ContentDecryptionModule_11 {
+ public:
+  static const int kVersion = 11;
+  static const bool kIsStable = false;
+  typedef Host_11 Host;
+
+  // Initializes the CDM instance, providing information about permitted
+  // functionalities. The CDM must respond by calling Host::OnInitialized()
+  // with whether the initialization succeeded. No other calls will be made by
+  // the host before Host::OnInitialized() returns.
+  // If |allow_distinctive_identifier| is false, messages from the CDM,
+  // such as message events, must not contain a Distinctive Identifier,
+  // even in an encrypted form.
+  // If |allow_persistent_state| is false, the CDM must not attempt to
+  // persist state. Calls to CreateFileIO() will fail.
+  // If |use_hw_secure_codecs| is true, the CDM must ensure the decryption key
+  // and video buffers (compressed and uncompressed) are securely protected by
+  // hardware.
+  virtual void Initialize(bool allow_distinctive_identifier,
+                          bool allow_persistent_state,
+                          bool use_hw_secure_codecs) = 0;
+
+  // Gets the key status if the CDM has a hypothetical key with the |policy|.
+  // The CDM must respond by calling either Host::OnResolveKeyStatusPromise()
+  // with the result key status or Host::OnRejectPromise() if an unexpected
+  // error happened or this method is not supported.
+  virtual void GetStatusForPolicy(uint32_t promise_id,
+                                  const Policy& policy) = 0;
+
+  // SetServerCertificate(), CreateSessionAndGenerateRequest(), LoadSession(),
+  // UpdateSession(), CloseSession(), and RemoveSession() all accept a
+  // |promise_id|, which must be passed to the completion Host method
+  // (e.g. Host::OnResolveNewSessionPromise()).
+
+  // Provides a server certificate to be used to encrypt messages to the
+  // license server. The CDM must respond by calling either
+  // Host::OnResolvePromise() or Host::OnRejectPromise().
+  // If the CDM does not support server certificates, the promise should be
+  // rejected with kExceptionNotSupportedError. If |server_certificate_data|
+  // is empty, reject with kExceptionTypeError. Any other error should be
+  // rejected with kExceptionInvalidStateError or kExceptionQuotaExceededError.
+  // TODO(crbug.com/796417): Add support for the promise to return true or
+  // false, rather than using kExceptionNotSupportedError to mean false.
+  virtual void SetServerCertificate(uint32_t promise_id,
+                                    const uint8_t* server_certificate_data,
+                                    uint32_t server_certificate_data_size) = 0;
+
+  // Creates a session given |session_type|, |init_data_type|, and |init_data|.
+  // The CDM must respond by calling either Host::OnResolveNewSessionPromise()
+  // or Host::OnRejectPromise().
+  virtual void CreateSessionAndGenerateRequest(uint32_t promise_id,
+                                               SessionType session_type,
+                                               InitDataType init_data_type,
+                                               const uint8_t* init_data,
+                                               uint32_t init_data_size) = 0;
+
+  // Loads the session of type |session_type| specified by |session_id|.
+  // The CDM must respond by calling either Host::OnResolveNewSessionPromise()
+  // or Host::OnRejectPromise(). If the session is not found, call
+  // Host::OnResolveNewSessionPromise() with session_id = NULL.
+  virtual void LoadSession(uint32_t promise_id, SessionType session_type,
+                           const char* session_id,
+                           uint32_t session_id_size) = 0;
+
+  // Updates the session with |response|. The CDM must respond by calling
+  // either Host::OnResolvePromise() or Host::OnRejectPromise().
+  virtual void UpdateSession(uint32_t promise_id, const char* session_id,
+                             uint32_t session_id_size, const uint8_t* response,
+                             uint32_t response_size) = 0;
+
+  // Requests that the CDM close the session. The CDM must respond by calling
+  // either Host::OnResolvePromise() or Host::OnRejectPromise() when the request
+  // has been processed. This may be before the session is closed. Once the
+  // session is closed, Host::OnSessionClosed() must also be called.
+  virtual void CloseSession(uint32_t promise_id, const char* session_id,
+                            uint32_t session_id_size) = 0;
+
+  // Removes any stored session data associated with this session. Removes all
+  // license(s) and key(s) associated with the session, whether they are in
+  // memory, persistent store, or both. For persistent session types, other
+  // session data (e.g. record of license destruction) will be cleared as
+  // defined for each session type once a release message acknowledgment is
+  // processed by UpdateSession(). The CDM must respond by calling either
+  // Host::OnResolvePromise() or Host::OnRejectPromise() when the request has
+  // been processed.
+  virtual void RemoveSession(uint32_t promise_id, const char* session_id,
+                             uint32_t session_id_size) = 0;
+
+  // Performs scheduled operation with |context| when the timer fires.
+  virtual void TimerExpired(void* context) = 0;
+
+  // Decrypts the |encrypted_buffer|.
+  //
+  // Returns kSuccess if decryption succeeded, in which case the callee
+  // should have filled the |decrypted_buffer| and passed the ownership of
+  // |data| in |decrypted_buffer| to the caller.
+  // Returns kNoKey if the CDM did not have the necessary decryption key
+  // to decrypt.
+  // Returns kDecryptError if any other error happened.
+  // If the return value is not kSuccess, |decrypted_buffer| should be ignored
+  // by the caller.
+  virtual Status Decrypt(const InputBuffer_2& encrypted_buffer,
+                         DecryptedBlock* decrypted_buffer) = 0;
+
+  // Initializes the CDM audio decoder with |audio_decoder_config|. This
+  // function must be called before DecryptAndDecodeSamples() is called.
+  //
+  // Returns kSuccess if the |audio_decoder_config| is supported and the CDM
+  // audio decoder is successfully initialized.
+  // Returns kInitializationError if |audio_decoder_config| is not supported.
+  // The CDM may still be able to do Decrypt().
+  // Returns kDeferredInitialization if the CDM is not ready to initialize the
+  // decoder at this time. Must call Host::OnDeferredInitializationDone() once
+  // initialization is complete.
+  virtual Status InitializeAudioDecoder(
+      const AudioDecoderConfig_2& audio_decoder_config) = 0;
+
+  // Initializes the CDM video decoder with |video_decoder_config|. This
+  // function must be called before DecryptAndDecodeFrame() is called.
+  //
+  // Returns kSuccess if the |video_decoder_config| is supported and the CDM
+  // video decoder is successfully initialized.
+  // Returns kInitializationError if |video_decoder_config| is not supported.
+  // The CDM may still be able to do Decrypt().
+  // Returns kDeferredInitialization if the CDM is not ready to initialize the
+  // decoder at this time. Must call Host::OnDeferredInitializationDone() once
+  // initialization is complete.
+  virtual Status InitializeVideoDecoder(
+      const VideoDecoderConfig_3& video_decoder_config) = 0;
+
+  // De-initializes the CDM decoder and sets it to an uninitialized state. The
+  // caller can initialize the decoder again after this call to re-initialize
+  // it. This can be used to reconfigure the decoder if the configuration
+  // changes.
+  virtual void DeinitializeDecoder(StreamType decoder_type) = 0;
+
+  // Resets the CDM decoder to an initialized clean state. All internal buffers
+  // MUST be flushed.
+  virtual void ResetDecoder(StreamType decoder_type) = 0;
+
+  // Decrypts the |encrypted_buffer| and decodes the decrypted buffer into a
+  // |video_frame|. Upon end-of-stream, the caller should call this function
+  // repeatedly with empty |encrypted_buffer| (|data| == NULL) until
+  // kNeedMoreData is returned.
+  //
+  // Returns kSuccess if decryption and decoding both succeeded, in which case
+  // the callee will have filled the |video_frame| and passed the ownership of
+  // |frame_buffer| in |video_frame| to the caller.
+  // Returns kNoKey if the CDM did not have the necessary decryption key
+  // to decrypt.
+  // Returns kNeedMoreData if more data was needed by the decoder to generate
+  // a decoded frame (e.g. during initialization and end-of-stream).
+  // Returns kDecryptError if any decryption error happened.
+  // Returns kDecodeError if any decoding error happened.
+  // If the return value is not kSuccess, |video_frame| should be ignored by
+  // the caller.
+  virtual Status DecryptAndDecodeFrame(const InputBuffer_2& encrypted_buffer,
+                                       VideoFrame_2* video_frame) = 0;
+
+  // Decrypts the |encrypted_buffer| and decodes the decrypted buffer into
+  // |audio_frames|. Upon end-of-stream, the caller should call this function
+  // repeatedly with empty |encrypted_buffer| (|data| == NULL) until only empty
+  // |audio_frames| is produced.
+  //
+  // Returns kSuccess if decryption and decoding both succeeded, in which case
+  // the callee will have filled |audio_frames| and passed the ownership of
+  // |data| in |audio_frames| to the caller.
+  // Returns kNoKey if the CDM did not have the necessary decryption key
+  // to decrypt.
+  // Returns kNeedMoreData if more data was needed by the decoder to generate
+  // audio samples (e.g. during initialization and end-of-stream).
+  // Returns kDecryptError if any decryption error happened.
+  // Returns kDecodeError if any decoding error happened.
+  // If the return value is not kSuccess, |audio_frames| should be ignored by
+  // the caller.
+  virtual Status DecryptAndDecodeSamples(const InputBuffer_2& encrypted_buffer,
+                                         AudioFrames* audio_frames) = 0;
+
+  // Called by the host after a platform challenge was initiated via
+  // Host::SendPlatformChallenge().
+  virtual void OnPlatformChallengeResponse(
+      const PlatformChallengeResponse& response) = 0;
+
+  // Called by the host after a call to Host::QueryOutputProtectionStatus(). The
+  // |link_mask| is a bit mask of OutputLinkTypes and |output_protection_mask|
+  // is a bit mask of OutputProtectionMethods. If |result| is kQueryFailed,
+  // then |link_mask| and |output_protection_mask| are undefined and should
+  // be ignored.
+  virtual void OnQueryOutputProtectionStatus(
+      QueryResult result, uint32_t link_mask,
+      uint32_t output_protection_mask) = 0;
+
+  // Called by the host after a call to Host::RequestStorageId(). If the
+  // version of the storage ID requested is available, |storage_id| and
+  // |storage_id_size| are set appropriately. |version| will be the same as
+  // what was requested, unless 0 (latest) was requested, in which case
+  // |version| will be the actual version number for the |storage_id| returned.
+  // If the requested version is not available, null/zero will be provided as
+  // |storage_id| and |storage_id_size|, respectively, and |version| should be
+  // ignored.
+  virtual void OnStorageId(uint32_t version, const uint8_t* storage_id,
+                           uint32_t storage_id_size) = 0;
+
+  // Destroys the object in the same context as it was created.
+  virtual void Destroy() = 0;
+
+ protected:
+  ContentDecryptionModule_11() {}
+  virtual ~ContentDecryptionModule_11() {}
+};
+
+class CDM_CLASS_API Host_10 {
+ public:
+  static const int kVersion = 10;
+
+  // Returns a Buffer* containing non-zero members upon success, or NULL on
+  // failure. The caller owns the Buffer* after this call. The buffer is not
+  // guaranteed to be zero initialized. The capacity of the allocated Buffer
+  // is guaranteed to be not less than |capacity|.
+  virtual Buffer* Allocate(uint32_t capacity) = 0;
+
+  // Requests the host to call ContentDecryptionModule::TimerFired() |delay_ms|
+  // from now with |context|.
+  virtual void SetTimer(int64_t delay_ms, void* context) = 0;
+
+  // Returns the current wall time.
+  virtual Time GetCurrentWallTime() = 0;
+
+  // Called by the CDM with the result after the CDM instance was initialized.
+  virtual void OnInitialized(bool success) = 0;
+
+  // Called by the CDM when a key status is available in response to
+  // GetStatusForPolicy().
+  virtual void OnResolveKeyStatusPromise(uint32_t promise_id,
+                                         KeyStatus key_status) = 0;
+
+  // Called by the CDM when a session is created or loaded and the value for the
+  // MediaKeySession's sessionId attribute is available (|session_id|).
+  // This must be called before OnSessionMessage() or
+  // OnSessionKeysChange() is called for the same session. |session_id_size|
+  // should not include null termination.
+  // When called in response to LoadSession(), the |session_id| must be the
+  // same as the |session_id| passed in LoadSession(), or NULL if the
+  // session could not be loaded.
+  virtual void OnResolveNewSessionPromise(uint32_t promise_id,
+                                          const char* session_id,
+                                          uint32_t session_id_size) = 0;
+
+  // Called by the CDM when a session is updated or released.
+  virtual void OnResolvePromise(uint32_t promise_id) = 0;
+
+  // Called by the CDM when an error occurs as a result of one of the
+  // ContentDecryptionModule calls that accept a |promise_id|.
+  // |exception| must be specified. |error_message| and |system_code|
+  // are optional. |error_message_size| should not include null termination.
+  virtual void OnRejectPromise(uint32_t promise_id, Exception exception,
+                               uint32_t system_code, const char* error_message,
+                               uint32_t error_message_size) = 0;
+
+  // Called by the CDM when it has a message for session |session_id|.
+  // Size parameters should not include null termination.
+  virtual void OnSessionMessage(const char* session_id,
+                                uint32_t session_id_size,
+                                MessageType message_type, const char* message,
+                                uint32_t message_size) = 0;
+
+  // Called by the CDM when there has been a change in keys or their status for
+  // session |session_id|. |has_additional_usable_key| should be set if a
+  // key is newly usable (e.g. new key available, previously expired key has
+  // been renewed, etc.) and the browser should attempt to resume playback.
+  // |keys_info| is the list of key IDs for this session along with their
+  // current status. |keys_info_count| is the number of entries in |keys_info|.
+  // Size parameter for |session_id| should not include null termination.
+  virtual void OnSessionKeysChange(const char* session_id,
+                                   uint32_t session_id_size,
+                                   bool has_additional_usable_key,
+                                   const KeyInformation* keys_info,
+                                   uint32_t keys_info_count) = 0;
+
+  // Called by the CDM when there has been a change in the expiration time for
+  // session |session_id|. This can happen as the result of an Update() call
+  // or some other event. If this happens as a result of a call to Update(),
+  // it must be called before resolving the Update() promise. |new_expiry_time|
+  // represents the time after which the key(s) in the session will no longer
+  // be usable for decryption. It can be 0 if no such time exists or if the
+  // license explicitly never expires. Size parameter should not include null
+  // termination.
+  virtual void OnExpirationChange(const char* session_id,
+                                  uint32_t session_id_size,
+                                  Time new_expiry_time) = 0;
+
+  // Called by the CDM when session |session_id| is closed. Size
+  // parameter should not include null termination.
+  virtual void OnSessionClosed(const char* session_id,
+                               uint32_t session_id_size) = 0;
+
+  // The following are optional methods that may not be implemented on all
+  // platforms.
+
+  // Sends a platform challenge for the given |service_id|. |challenge| is at
+  // most 256 bits of data to be signed. Once the challenge has been completed,
+  // the host will call ContentDecryptionModule::OnPlatformChallengeResponse()
+  // with the signed challenge response and platform certificate. Size
+  // parameters should not include null termination.
+  virtual void SendPlatformChallenge(const char* service_id,
+                                     uint32_t service_id_size,
+                                     const char* challenge,
+                                     uint32_t challenge_size) = 0;
+
+  // Attempts to enable output protection (e.g. HDCP) on the display link. The
+  // |desired_protection_mask| is a bit mask of OutputProtectionMethods. No
+  // status callback is issued, the CDM must call QueryOutputProtectionStatus()
+  // periodically to ensure the desired protections are applied.
+  virtual void EnableOutputProtection(uint32_t desired_protection_mask) = 0;
+
+  // Requests the current output protection status. Once the host has the status
+  // it will call ContentDecryptionModule::OnQueryOutputProtectionStatus().
+  virtual void QueryOutputProtectionStatus() = 0;
+
+  // Must be called by the CDM if it returned kDeferredInitialization during
+  // InitializeAudioDecoder() or InitializeVideoDecoder().
+  virtual void OnDeferredInitializationDone(StreamType stream_type,
+                                            Status decoder_status) = 0;
+
+  // Creates a FileIO object from the host to do file IO operation. Returns NULL
+  // if a FileIO object cannot be obtained. Once a valid FileIO object is
+  // returned, |client| must be valid until FileIO::Close() is called. The
+  // CDM can call this method multiple times to operate on different files.
+  virtual FileIO* CreateFileIO(FileIOClient* client) = 0;
+
+  // Requests a specific version of the storage ID. A storage ID is a stable,
+  // device specific ID used by the CDM to securely store persistent data. The
+  // ID will be returned by the host via ContentDecryptionModule::OnStorageId().
+  // If |version| is 0, the latest version will be returned. All |version|s
+  // that are greater than or equal to 0x80000000 are reserved for the CDM and
+  // should not be supported or returned by the host. The CDM must not expose
+  // the ID outside the client device, even in encrypted form.
+  virtual void RequestStorageId(uint32_t version) = 0;
+
+ protected:
+  Host_10() {}
+  virtual ~Host_10() {}
+};
+
+class CDM_CLASS_API Host_11 {
+ public:
+  static const int kVersion = 11;
+
+  // Returns a Buffer* containing non-zero members upon success, or NULL on
+  // failure. The caller owns the Buffer* after this call. The buffer is not
+  // guaranteed to be zero initialized. The capacity of the allocated Buffer
+  // is guaranteed to be not less than |capacity|.
+  virtual Buffer* Allocate(uint32_t capacity) = 0;
+
+  // Requests the host to call ContentDecryptionModule::TimerFired() |delay_ms|
+  // from now with |context|.
+  virtual void SetTimer(int64_t delay_ms, void* context) = 0;
+
+  // Returns the current wall time.
+  virtual Time GetCurrentWallTime() = 0;
+
+  // Called by the CDM with the result after the CDM instance was initialized.
+  virtual void OnInitialized(bool success) = 0;
+
+  // Called by the CDM when a key status is available in response to
+  // GetStatusForPolicy().
+  virtual void OnResolveKeyStatusPromise(uint32_t promise_id,
+                                         KeyStatus key_status) = 0;
+
+  // Called by the CDM when a session is created or loaded and the value for the
+  // MediaKeySession's sessionId attribute is available (|session_id|).
+  // This must be called before OnSessionMessage() or
+  // OnSessionKeysChange() is called for the same session. |session_id_size|
+  // should not include null termination.
+  // When called in response to LoadSession(), the |session_id| must be the
+  // same as the |session_id| passed in LoadSession(), or NULL if the
+  // session could not be loaded.
+  virtual void OnResolveNewSessionPromise(uint32_t promise_id,
+                                          const char* session_id,
+                                          uint32_t session_id_size) = 0;
+
+  // Called by the CDM when a session is updated or released.
+  virtual void OnResolvePromise(uint32_t promise_id) = 0;
+
+  // Called by the CDM when an error occurs as a result of one of the
+  // ContentDecryptionModule calls that accept a |promise_id|.
+  // |exception| must be specified. |error_message| and |system_code|
+  // are optional. |error_message_size| should not include null termination.
+  virtual void OnRejectPromise(uint32_t promise_id, Exception exception,
+                               uint32_t system_code, const char* error_message,
+                               uint32_t error_message_size) = 0;
+
+  // Called by the CDM when it has a message for session |session_id|.
+  // Size parameters should not include null termination.
+  virtual void OnSessionMessage(const char* session_id,
+                                uint32_t session_id_size,
+                                MessageType message_type, const char* message,
+                                uint32_t message_size) = 0;
+
+  // Called by the CDM when there has been a change in keys or their status for
+  // session |session_id|. |has_additional_usable_key| should be set if a
+  // key is newly usable (e.g. new key available, previously expired key has
+  // been renewed, etc.) and the browser should attempt to resume playback.
+  // |keys_info| is the list of key IDs for this session along with their
+  // current status. |keys_info_count| is the number of entries in |keys_info|.
+  // Size parameter for |session_id| should not include null termination.
+  virtual void OnSessionKeysChange(const char* session_id,
+                                   uint32_t session_id_size,
+                                   bool has_additional_usable_key,
+                                   const KeyInformation* keys_info,
+                                   uint32_t keys_info_count) = 0;
+
+  // Called by the CDM when there has been a change in the expiration time for
+  // session |session_id|. This can happen as the result of an Update() call
+  // or some other event. If this happens as a result of a call to Update(),
+  // it must be called before resolving the Update() promise. |new_expiry_time|
+  // represents the time after which the key(s) in the session will no longer
+  // be usable for decryption. It can be 0 if no such time exists or if the
+  // license explicitly never expires. Size parameter should not include null
+  // termination.
+  virtual void OnExpirationChange(const char* session_id,
+                                  uint32_t session_id_size,
+                                  Time new_expiry_time) = 0;
+
+  // Called by the CDM when session |session_id| is closed. Size
+  // parameter should not include null termination.
+  virtual void OnSessionClosed(const char* session_id,
+                               uint32_t session_id_size) = 0;
+
+  // The following are optional methods that may not be implemented on all
+  // platforms.
+
+  // Sends a platform challenge for the given |service_id|. |challenge| is at
+  // most 256 bits of data to be signed. Once the challenge has been completed,
+  // the host will call ContentDecryptionModule::OnPlatformChallengeResponse()
+  // with the signed challenge response and platform certificate. Size
+  // parameters should not include null termination.
+  virtual void SendPlatformChallenge(const char* service_id,
+                                     uint32_t service_id_size,
+                                     const char* challenge,
+                                     uint32_t challenge_size) = 0;
+
+  // Attempts to enable output protection (e.g. HDCP) on the display link. The
+  // |desired_protection_mask| is a bit mask of OutputProtectionMethods. No
+  // status callback is issued, the CDM must call QueryOutputProtectionStatus()
+  // periodically to ensure the desired protections are applied.
+  virtual void EnableOutputProtection(uint32_t desired_protection_mask) = 0;
+
+  // Requests the current output protection status. Once the host has the status
+  // it will call ContentDecryptionModule::OnQueryOutputProtectionStatus().
+  virtual void QueryOutputProtectionStatus() = 0;
+
+  // Must be called by the CDM if it returned kDeferredInitialization during
+  // InitializeAudioDecoder() or InitializeVideoDecoder().
+  virtual void OnDeferredInitializationDone(StreamType stream_type,
+                                            Status decoder_status) = 0;
+
+  // Creates a FileIO object from the host to do file IO operation. Returns NULL
+  // if a FileIO object cannot be obtained. Once a valid FileIO object is
+  // returned, |client| must be valid until FileIO::Close() is called. The
+  // CDM can call this method multiple times to operate on different files.
+  virtual FileIO* CreateFileIO(FileIOClient* client) = 0;
+
+  // Requests a CdmProxy that proxies part of CDM functionalities to a different
+  // entity, e.g. a hardware CDM module. A CDM instance can have at most one
+  // CdmProxy throughout its lifetime, which must be requested and initialized
+  // during CDM instance initialization time, i.e. in or after CDM::Initialize()
+  // and before OnInitialized() is called, to ensure proper connection of the
+  // CdmProxy and the media player (e.g. hardware decoder). The CdmProxy is
+  // owned by the host and is guaranteed to be valid throughout the CDM
+  // instance's lifetime. The CDM must ensure that the |client| remain valid
+  // before the CDM instance is destroyed. Returns null if CdmProxy is not
+  // supported, called before CDM::Initialize(), RequestCdmProxy() is called
+  // more than once, or called after the CDM instance has been initialized.
+  virtual CdmProxy* RequestCdmProxy(CdmProxyClient* client) = 0;
+
+  // Requests a specific version of the storage ID. A storage ID is a stable,
+  // device specific ID used by the CDM to securely store persistent data. The
+  // ID will be returned by the host via ContentDecryptionModule::OnStorageId().
+  // If |version| is 0, the latest version will be returned. All |version|s
+  // that are greater than or equal to 0x80000000 are reserved for the CDM and
+  // should not be supported or returned by the host. The CDM must not expose
+  // the ID outside the client device, even in encrypted form.
+  virtual void RequestStorageId(uint32_t version) = 0;
+
+ protected:
+  Host_11() {}
+  virtual ~Host_11() {}
+};
+
+}  // namespace cdm
+
+#endif  // CDM_CONTENT_DECRYPTION_MODULE_H_
diff --git a/dom/media/gmp/widevine-adapter/content_decryption_module_export.h b/dom/media/gmp/widevine-adapter/content_decryption_module_export.h
new file mode 100644
index 0000000000..932708deba
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/content_decryption_module_export.h
@@ -0,0 +1,38 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_
+#define CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_
+
+// Define CDM_API so that functionality implemented by the CDM module
+// can be exported to consumers.
+#if defined(_WIN32)
+
+#if defined(CDM_IMPLEMENTATION)
+#define CDM_API __declspec(dllexport)
+#else
+#define CDM_API __declspec(dllimport)
+#endif  // defined(CDM_IMPLEMENTATION)
+
+#else  // defined(_WIN32)
+#define CDM_API __attribute__((visibility("default")))
+#endif  // defined(_WIN32)
+
+// Define CDM_CLASS_API to export class types. We have to add visibility
+// attributes to make sure virtual tables in CDM consumer and CDM implementation
+// are the same. Generally, it was always a good idea, as there're no guarantees
+// about that for the internal symbols, but it has only become a practical issue
+// after introduction of LTO devirtualization. See more details on
+// https://crbug.com/609564#c35
+#if defined(_WIN32)
+#if defined(__clang__)
+#define CDM_CLASS_API [[clang::lto_visibility_public]]
+#else
+#define CDM_CLASS_API
+#endif
+#else  // defined(_WIN32)
+#define CDM_CLASS_API __attribute__((visibility("default")))
+#endif  // defined(_WIN32)
+
+#endif  // CDM_CONTENT_DECRYPTION_MODULE_EXPORT_H_
diff --git a/dom/media/gmp/widevine-adapter/content_decryption_module_ext.h b/dom/media/gmp/widevine-adapter/content_decryption_module_ext.h
new file mode 100644
index 0000000000..5df8344e60
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/content_decryption_module_ext.h
@@ -0,0 +1,64 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CDM_CONTENT_DECRYPTION_MODULE_EXT_H_
+#define CDM_CONTENT_DECRYPTION_MODULE_EXT_H_
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+#include "content_decryption_module_export.h"
+
+#if defined(_MSC_VER)
+typedef unsigned int uint32_t;
+#else
+#include <stdint.h>
+#endif
+
+namespace cdm {
+
+#if defined(_WIN32)
+typedef wchar_t FilePathCharType;
+typedef HANDLE PlatformFile;
+const PlatformFile kInvalidPlatformFile = INVALID_HANDLE_VALUE;
+#else
+typedef char FilePathCharType;
+typedef int PlatformFile;
+const PlatformFile kInvalidPlatformFile = -1;
+#endif  // defined(_WIN32)
+
+struct HostFile {
+  HostFile(const FilePathCharType* file_path,
+           PlatformFile file,
+           PlatformFile sig_file)
+      : file_path(file_path), file(file), sig_file(sig_file) {}
+
+  // File that is part of the host of the CDM.
+  const FilePathCharType* file_path = nullptr;
+  PlatformFile file = kInvalidPlatformFile;
+
+  // Signature file for |file|.
+  PlatformFile sig_file = kInvalidPlatformFile;
+};
+
+}  // namespace cdm
+
+extern "C" {
+
+// Functions in this file are dynamically retrieved by their versioned function
+// names. Increment the version number for any backward incompatible API
+// changes.
+
+// Verifies CDM host. All files in |host_files| are opened in read-only mode.
+//
+// Returns false and closes all files if there is an immediate failure.
+// Otherwise returns true as soon as possible and processes the files
+// asynchronously. All files MUST be closed by the CDM after this one-time
+// processing is finished.
+CDM_API bool VerifyCdmHost_0(const cdm::HostFile* host_files,
+                             uint32_t num_files);
+}
+
+#endif  // CDM_CONTENT_DECRYPTION_MODULE_EXT_H_
diff --git a/dom/media/gmp/widevine-adapter/content_decryption_module_proxy.h b/dom/media/gmp/widevine-adapter/content_decryption_module_proxy.h
new file mode 100644
index 0000000000..d3edff8b37
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/content_decryption_module_proxy.h
@@ -0,0 +1,121 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CDM_CONTENT_DECRYPTION_MODULE_PROXY_H_
+#define CDM_CONTENT_DECRYPTION_MODULE_PROXY_H_
+
+#include "content_decryption_module_export.h"
+
+#if defined(_MSC_VER)
+typedef unsigned char uint8_t;
+typedef unsigned int uint32_t;
+typedef unsigned __int64 uint64_t;
+#else
+#  include <stdint.h>
+#endif
+
+namespace cdm {
+
+class CDM_CLASS_API CdmProxyClient;
+
+// A proxy class for the CDM.
+// In general, the interpretation of the CdmProxy and CdmProxyClient method
+// parameters are protocol dependent. For enum parameters, values outside the
+// enum range may not work.
+class CDM_CLASS_API CdmProxy {
+ public:
+  enum Function : uint32_t {
+    // For Intel Negotiate Crypto SessionKey Exchange (CSME) path to call
+    // ID3D11VideoContext::NegotiateCryptoSessionKeyExchange.
+    kIntelNegotiateCryptoSessionKeyExchange = 1,
+    // There will be more values in the future e.g. for D3D11 RSA method.
+  };
+
+  enum KeyType : uint32_t {
+    kDecryptOnly = 0,
+    kDecryptAndDecode = 1,
+  };
+
+  // Initializes the proxy. The results will be returned in
+  // CdmProxyClient::OnInitialized().
+  virtual void Initialize() = 0;
+
+  // Processes and updates the state of the proxy.
+  // |output_data_size| is required by some protocol to set up the output data.
+  // The operation may fail if the |output_data_size| is wrong. The results will
+  // be returned in CdmProxyClient::OnProcessed().
+  virtual void Process(Function function, uint32_t crypto_session_id,
+                       const uint8_t* input_data, uint32_t input_data_size,
+                       uint32_t output_data_size) = 0;
+
+  // Creates a crypto session for handling media.
+  // If extra data has to be passed to further setup the media crypto session,
+  // pass the data as |input_data|. The results will be returned in
+  // CdmProxyClient::OnMediaCryptoSessionCreated().
+  virtual void CreateMediaCryptoSession(const uint8_t* input_data,
+                                        uint32_t input_data_size) = 0;
+
+  // Sets a key for the session identified by |crypto_session_id|.
+  virtual void SetKey(uint32_t crypto_session_id, const uint8_t* key_id,
+                      uint32_t key_id_size, KeyType key_type,
+                      const uint8_t* key_blob, uint32_t key_blob_size) = 0;
+
+  // Removes a key for the session identified by |crypto_session_id|.
+  virtual void RemoveKey(uint32_t crypto_session_id, const uint8_t* key_id,
+                         uint32_t key_id_size) = 0;
+
+ protected:
+  CdmProxy() {}
+  virtual ~CdmProxy() {}
+};
+
+// Responses to CdmProxy calls. All responses will be called asynchronously.
+class CDM_CLASS_API CdmProxyClient {
+ public:
+  enum Status : uint32_t {
+    kOk,
+    kFail,
+  };
+
+  enum Protocol : uint32_t {
+    kNone = 0,  // No protocol supported. Can be used in failure cases.
+    kIntel,     // Method using Intel CSME.
+    // There will be more values in the future e.g. kD3D11RsaHardware,
+    // kD3D11RsaSoftware to use the D3D11 RSA method.
+  };
+
+  // Callback for Initialize(). If the proxy created a crypto session, then the
+  // ID for the crypto session is |crypto_session_id|.
+  virtual void OnInitialized(Status status, Protocol protocol,
+                             uint32_t crypto_session_id) = 0;
+
+  // Callback for Process(). |output_data| is the output of processing.
+  virtual void OnProcessed(Status status, const uint8_t* output_data,
+                           uint32_t output_data_size) = 0;
+
+  // Callback for CreateMediaCryptoSession(). On success:
+  // - |crypto_session_id| is the ID for the created crypto session.
+  // - |output_data| is extra value, if any.
+  // Otherwise, |crypto_session_id| and |output_data| should be ignored.
+  virtual void OnMediaCryptoSessionCreated(Status status,
+                                           uint32_t crypto_session_id,
+                                           uint64_t output_data) = 0;
+
+  // Callback for SetKey().
+  virtual void OnKeySet(Status status) = 0;
+
+  // Callback for RemoveKey().
+  virtual void OnKeyRemoved(Status status) = 0;
+
+  // Called when there is a hardware reset and all the hardware context is lost.
+  virtual void NotifyHardwareReset() = 0;
+
+ protected:
+  CdmProxyClient() {}
+  virtual ~CdmProxyClient() {}
+};
+
+}  // namespace cdm
+
+#endif  // CDM_CONTENT_DECRYPTION_MODULE_PROXY_H_
diff --git a/dom/media/gmp/widevine-adapter/moz.build b/dom/media/gmp/widevine-adapter/moz.build
new file mode 100644
index 0000000000..b1b7582407
--- /dev/null
+++ b/dom/media/gmp/widevine-adapter/moz.build
@@ -0,0 +1,21 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+SOURCES += [
+    "WidevineFileIO.cpp",
+    "WidevineUtils.cpp",
+    "WidevineVideoFrame.cpp",
+]
+
+EXPORTS += ["WidevineFileIO.h", "WidevineUtils.h", "WidevineVideoFrame.h"]
+
+FINAL_LIBRARY = "xul"
+
+LOCAL_INCLUDES += [
+    "/dom/media/gmp",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")