Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

27 files changed, 3471 insertions, 0 deletions

diff --git a/gfx/vr/ipc/PVR.ipdl b/gfx/vr/ipc/PVR.ipdl
new file mode 100644
index 0000000000..57fba8c235
--- /dev/null
+++ b/gfx/vr/ipc/PVR.ipdl
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 8; 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/. */
+
+using mozilla::TimeStamp from "mozilla/TimeStamp.h";
+using mozilla::gfx::VRControllerType from "moz_external_vr.h";
+using mozilla::dom::NativeThreadId from "mozilla/dom/NativeThreadId.h";
+include "VRMessageUtils.h";
+include "VRParent.h";
+include "VRChild.h";
+
+include GraphicsMessages;
+include MemoryReportTypes;
+include PrefsTypes;
+include protocol PVRGPU;
+
+namespace mozilla {
+namespace gfx {
+
+[NeedsOtherPid, ChildImpl="VRChild", ParentImpl="VRParent"]
+async protocol PVR
+{
+parent:
+  async NewGPUVRManager(Endpoint<PVRGPUParent> endpoint);
+  async Init(GfxVarUpdate[] vars, DevicePrefs devicePrefs);
+
+  async UpdateVar(GfxVarUpdate var);
+  async PreferenceUpdate(Pref pref);
+  async OpenVRControllerActionPathToVR(nsCString aPath);
+  async OpenVRControllerManifestPathToVR(VRControllerType aType, nsCString aPath);
+  async RequestMemoryReport(uint32_t generation,
+                            bool anonymize,
+                            bool minimizeMemoryUsage,
+                            FileDescriptor? DMDFile)
+      returns (uint32_t aGeneration);
+
+child:
+  // Sent when the GPU process has initialized devices. This occurs once, after
+  // Init().
+  async InitComplete();
+  async OpenVRControllerActionPathToParent(nsCString aPath);
+  async OpenVRControllerManifestPathToParent(VRControllerType aType, nsCString aPath);
+  async InitCrashReporter(NativeThreadId threadId);
+  async AddMemoryReport(MemoryReport aReport);
+};
+
+} // namespace gfx
+} // namespace mozilla
diff --git a/gfx/vr/ipc/PVRGPU.ipdl b/gfx/vr/ipc/PVRGPU.ipdl
new file mode 100644
index 0000000000..c8bf34234f
--- /dev/null
+++ b/gfx/vr/ipc/PVRGPU.ipdl
@@ -0,0 +1,28 @@
+/* -*- Mode: C++; tab-width: 8; 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 "VRGPUParent.h";
+include "VRGPUChild.h";
+
+namespace mozilla {
+namespace gfx {
+
+// The parent process is the VR process.
+// The child process is the GPU process.
+[NeedsOtherPid, ChildImpl="VRGPUChild", ParentImpl="VRGPUParent"]
+async protocol PVRGPU
+{
+parent:
+  async StartVRService();
+  async StopVRService();
+  async PuppetSubmit(uint64_t[] aBuffer);
+  async PuppetReset();
+  async PuppetCheckForCompletion();
+child:
+  async NotifyPuppetComplete();
+};
+
+} // gfx
+} // mozilla
\ No newline at end of file
diff --git a/gfx/vr/ipc/PVRLayer.ipdl b/gfx/vr/ipc/PVRLayer.ipdl
new file mode 100644
index 0000000000..c6fa16fd2e
--- /dev/null
+++ b/gfx/vr/ipc/PVRLayer.ipdl
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 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 LayersSurfaces;
+include protocol PVRManager;
+
+include "mozilla/GfxMessageUtils.h";
+include "VRLayerChild.h";
+
+using mozilla::gfx::Rect from "mozilla/gfx/Rect.h";
+
+namespace mozilla {
+namespace gfx {
+
+[ManualDealloc, ChildImpl="VRLayerChild", ParentImpl=virtual]
+async protocol PVRLayer
+{
+  manager PVRManager;
+
+parent:
+  async SubmitFrame(SurfaceDescriptor aTexture, uint64_t aFrameId,
+                    Rect aLeftEyeRect, Rect aRightEyeRect);
+
+  async Destroy();
+
+child:
+  async __delete__();
+};
+
+} // gfx
+} // mozilla
diff --git a/gfx/vr/ipc/PVRManager.ipdl b/gfx/vr/ipc/PVRManager.ipdl
new file mode 100644
index 0000000000..c79be31c41
--- /dev/null
+++ b/gfx/vr/ipc/PVRManager.ipdl
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 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 LayersSurfaces;
+include protocol PVRLayer;
+include LayersMessages;
+include GamepadEventTypes;
+
+include "VRMessageUtils.h";
+include "VRManagerParent.h";
+include "VRManagerChild.h";
+
+using struct mozilla::gfx::VRFieldOfView from "gfxVR.h";
+using struct mozilla::gfx::VRDisplayInfo from "gfxVR.h";
+using struct mozilla::gfx::VRSensorUpdate from "gfxVR.h";
+using struct mozilla::gfx::VRHMDSensorState from "gfxVR.h";
+using struct mozilla::gfx::VRControllerInfo from "gfxVR.h";
+using struct mozilla::gfx::VRSubmitFrameResultInfo from "gfxVR.h";
+using mozilla::gfx::VRDisplayCapabilityFlags from "moz_external_vr.h";
+using mozilla::layers::LayersBackend from "mozilla/layers/LayersTypes.h";
+using mozilla::layers::TextureFlags from "mozilla/layers/CompositorTypes.h";
+using mozilla::dom::GamepadHandle from "mozilla/dom/GamepadHandle.h";
+
+
+namespace mozilla {
+namespace gfx {
+
+/**
+ * The PVRManager protocol is used to enable communication of VR display
+ * enumeration and sensor state between the compositor thread and
+ * content threads/processes.
+ */
+[NeedsOtherPid, ChildImpl="VRManagerChild", ParentImpl="VRManagerParent"]
+sync protocol PVRManager
+{
+  manages PVRLayer;
+
+parent:
+  async PVRLayer(uint32_t aDisplayID, uint32_t aGroup);
+
+  // Detect runtime capabilities.  This will return the presense of VR and/or AR
+  // runtime software, without enumerating or activating any hardware devices.
+  async DetectRuntimes();
+
+  // (Re)Enumerate VR Displays.  An updated list of VR displays will be returned
+  // asynchronously to children via UpdateDisplayInfo.
+  async RefreshDisplays();
+
+  async SetGroupMask(uint32_t aDisplayID, uint32_t aGroupMask);
+  async SetHaveEventListener(bool aHaveEventListener);
+
+  async ControllerListenerAdded();
+  async ControllerListenerRemoved();
+  async VibrateHaptic(GamepadHandle aGamepadHandle, uint32_t aHapticIndex,
+                      double aIntensity, double aDuration, uint32_t aPromiseID);
+  async StopVibrateHaptic(GamepadHandle aGamepadHandle);
+  async StartVRNavigation(uint32_t aDeviceID);
+  async StopVRNavigation(uint32_t aDeviceID, TimeDuration aDuration);
+  async StartActivity();
+  async StopActivity();
+
+  async RunPuppet(uint64_t[] buffer);
+  async ResetPuppet();
+
+child:
+  // Notify children of updated VR display enumeration and details.  This will
+  // be sent to all children when the parent receives RefreshDisplays, even
+  // if no changes have been detected.  This ensures that Promises exposed
+  // through DOM calls are always resolved.
+  async UpdateDisplayInfo(VRDisplayInfo aDisplayInfo);
+
+  async UpdateRuntimeCapabilities(VRDisplayCapabilityFlags aCapabilities);
+
+  async ReplyGamepadVibrateHaptic(uint32_t aPromiseID);
+  async NotifyPuppetCommandBufferCompleted(bool aSuccess);
+  async NotifyPuppetResetComplete();
+
+  async __delete__();
+
+};
+
+} // gfx
+} // mozilla
diff --git a/gfx/vr/ipc/VRChild.cpp b/gfx/vr/ipc/VRChild.cpp
new file mode 100644
index 0000000000..747cf16326
--- /dev/null
+++ b/gfx/vr/ipc/VRChild.cpp
@@ -0,0 +1,214 @@
+/* -*- 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 "VRChild.h"
+#include "VRProcessManager.h"
+#include "VRProcessParent.h"
+#include "gfxConfig.h"
+
+#include "mozilla/gfx/gfxVars.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/VsyncDispatcher.h"
+#include "mozilla/dom/MemoryReportRequest.h"
+
+namespace mozilla {
+namespace gfx {
+
+class OpenVRControllerManifestManager {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(OpenVRControllerManifestManager)
+ public:
+  explicit OpenVRControllerManifestManager() = default;
+
+  void SetOpenVRControllerActionPath(const nsCString& aPath) {
+    mAction = aPath;
+  }
+
+  void SetOpenVRControllerManifestPath(VRControllerType aType,
+                                       const nsCString& aPath) {
+    mManifest.InsertOrUpdate(static_cast<uint32_t>(aType), aPath);
+  }
+
+  bool GetActionPath(nsCString* aPath) {
+    if (!mAction.IsEmpty()) {
+      *aPath = mAction;
+      return true;
+    }
+    return false;
+  }
+
+  bool GetManifestPath(VRControllerType aType, nsCString* aPath) {
+    return mManifest.Get(static_cast<uint32_t>(aType), aPath);
+  }
+
+ private:
+  ~OpenVRControllerManifestManager() {
+    if (!mAction.IsEmpty() && remove(mAction.BeginReading()) != 0) {
+      MOZ_ASSERT(false, "Delete controller action file failed.");
+    }
+    mAction = "";
+
+    for (const auto& path : mManifest.Values()) {
+      if (!path.IsEmpty() && remove(path.BeginReading()) != 0) {
+        MOZ_ASSERT(false, "Delete controller manifest file failed.");
+      }
+    }
+    mManifest.Clear();
+  }
+
+  nsCString mAction;
+  nsTHashMap<nsUint32HashKey, nsCString> mManifest;
+  OpenVRControllerManifestManager(const OpenVRControllerManifestManager&) =
+      delete;
+
+  const OpenVRControllerManifestManager& operator=(
+      const OpenVRControllerManifestManager&) = delete;
+};
+
+StaticRefPtr<OpenVRControllerManifestManager> sOpenVRControllerManifestManager;
+
+VRChild::VRChild(VRProcessParent* aHost) : mHost(aHost), mVRReady(false) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+}
+
+VRChild::~VRChild() = default;
+
+mozilla::ipc::IPCResult VRChild::RecvAddMemoryReport(
+    const MemoryReport& aReport) {
+  if (mMemoryReportRequest) {
+    mMemoryReportRequest->RecvReport(aReport);
+  }
+  return IPC_OK();
+}
+
+void VRChild::ActorDestroy(ActorDestroyReason aWhy) {
+  if (aWhy == AbnormalShutdown) {
+    GenerateCrashReport(OtherPid());
+
+    Telemetry::Accumulate(
+        Telemetry::SUBPROCESS_ABNORMAL_ABORT,
+        nsDependentCString(XRE_GeckoProcessTypeToString(GeckoProcessType_VR)),
+        1);
+  }
+  gfxVars::RemoveReceiver(this);
+  mHost->OnChannelClosed();
+}
+
+void VRChild::Init() {
+  nsTArray<GfxVarUpdate> updates = gfxVars::FetchNonDefaultVars();
+
+  DevicePrefs devicePrefs;
+  devicePrefs.hwCompositing() = gfxConfig::GetValue(Feature::HW_COMPOSITING);
+  devicePrefs.d3d11Compositing() =
+      gfxConfig::GetValue(Feature::D3D11_COMPOSITING);
+  devicePrefs.oglCompositing() =
+      gfxConfig::GetValue(Feature::OPENGL_COMPOSITING);
+  devicePrefs.useD2D1() = gfxConfig::GetValue(Feature::DIRECT2D);
+
+  SendInit(updates, devicePrefs);
+
+  if (!sOpenVRControllerManifestManager) {
+    sOpenVRControllerManifestManager = new OpenVRControllerManifestManager();
+    NS_DispatchToMainThread(NS_NewRunnableFunction(
+        "ClearOnShutdown OpenVRControllerManifestManager",
+        []() { ClearOnShutdown(&sOpenVRControllerManifestManager); }));
+  }
+
+  nsCString output;
+  if (sOpenVRControllerManifestManager->GetActionPath(&output)) {
+    SendOpenVRControllerActionPathToVR(output);
+  }
+  if (sOpenVRControllerManifestManager->GetManifestPath(
+          VRControllerType::HTCVive, &output)) {
+    SendOpenVRControllerManifestPathToVR(VRControllerType::HTCVive, output);
+  }
+  if (sOpenVRControllerManifestManager->GetManifestPath(VRControllerType::MSMR,
+                                                        &output)) {
+    SendOpenVRControllerManifestPathToVR(VRControllerType::MSMR, output);
+  }
+  if (sOpenVRControllerManifestManager->GetManifestPath(
+          VRControllerType::ValveIndex, &output)) {
+    SendOpenVRControllerManifestPathToVR(VRControllerType::ValveIndex, output);
+  }
+  gfxVars::AddReceiver(this);
+}
+
+bool VRChild::EnsureVRReady() {
+  if (!mVRReady) {
+    return false;
+  }
+
+  return true;
+}
+
+mozilla::ipc::IPCResult VRChild::RecvOpenVRControllerActionPathToParent(
+    const nsCString& aPath) {
+  sOpenVRControllerManifestManager->SetOpenVRControllerActionPath(aPath);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRChild::RecvOpenVRControllerManifestPathToParent(
+    const VRControllerType& aType, const nsCString& aPath) {
+  sOpenVRControllerManifestManager->SetOpenVRControllerManifestPath(aType,
+                                                                    aPath);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRChild::RecvInitComplete() {
+  // We synchronously requested VR parameters before this arrived.
+  mVRReady = true;
+  return IPC_OK();
+}
+
+bool VRChild::SendRequestMemoryReport(const uint32_t& aGeneration,
+                                      const bool& aAnonymize,
+                                      const bool& aMinimizeMemoryUsage,
+                                      const Maybe<FileDescriptor>& aDMDFile) {
+  mMemoryReportRequest = MakeUnique<MemoryReportRequestHost>(aGeneration);
+
+  PVRChild::SendRequestMemoryReport(
+      aGeneration, aAnonymize, aMinimizeMemoryUsage, aDMDFile,
+      [&](const uint32_t& aGeneration2) {
+        if (VRProcessManager* vpm = VRProcessManager::Get()) {
+          if (VRChild* child = vpm->GetVRChild()) {
+            if (child->mMemoryReportRequest) {
+              child->mMemoryReportRequest->Finish(aGeneration2);
+              child->mMemoryReportRequest = nullptr;
+            }
+          }
+        }
+      },
+      [&](mozilla::ipc::ResponseRejectReason) {
+        if (VRProcessManager* vpm = VRProcessManager::Get()) {
+          if (VRChild* child = vpm->GetVRChild()) {
+            child->mMemoryReportRequest = nullptr;
+          }
+        }
+      });
+
+  return true;
+}
+
+void VRChild::OnVarChanged(const GfxVarUpdate& aVar) { SendUpdateVar(aVar); }
+
+class DeferredDeleteVRChild : public Runnable {
+ public:
+  explicit DeferredDeleteVRChild(RefPtr<VRChild>&& aChild)
+      : Runnable("gfx::DeferredDeleteVRChild"), mChild(std::move(aChild)) {}
+
+  NS_IMETHODIMP Run() override { return NS_OK; }
+
+ private:
+  RefPtr<VRChild> mChild;
+};
+
+/* static */
+void VRChild::Destroy(RefPtr<VRChild>&& aChild) {
+  NS_DispatchToMainThread(new DeferredDeleteVRChild(std::move(aChild)));
+}
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRChild.h b/gfx/vr/ipc/VRChild.h
new file mode 100644
index 0000000000..3d0db848c8
--- /dev/null
+++ b/gfx/vr/ipc/VRChild.h
@@ -0,0 +1,66 @@
+/* -*- 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 GFX_VR_CHILD_H
+#define GFX_VR_CHILD_H
+
+#include "mozilla/gfx/PVRChild.h"
+#include "mozilla/gfx/gfxVarReceiver.h"
+#include "mozilla/ipc/CrashReporterHelper.h"
+#include "mozilla/VsyncDispatcher.h"
+#include "moz_external_vr.h"
+
+namespace mozilla {
+namespace dom {
+class MemoryReportRequestHost;
+}  // namespace dom
+namespace gfx {
+
+class VRProcessParent;
+class VRChild;
+
+class VRChild final : public PVRChild,
+                      public ipc::CrashReporterHelper<GeckoProcessType_VR>,
+                      public gfxVarReceiver {
+  typedef mozilla::dom::MemoryReportRequestHost MemoryReportRequestHost;
+  friend class PVRChild;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING(VRChild, final)
+
+  explicit VRChild(VRProcessParent* aHost);
+
+  static void Destroy(RefPtr<VRChild>&& aChild);
+  void Init();
+  bool EnsureVRReady();
+  virtual void OnVarChanged(const GfxVarUpdate& aVar) override;
+  bool SendRequestMemoryReport(const uint32_t& aGeneration,
+                               const bool& aAnonymize,
+                               const bool& aMinimizeMemoryUsage,
+                               const Maybe<ipc::FileDescriptor>& aDMDFile);
+
+ protected:
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+  mozilla::ipc::IPCResult RecvOpenVRControllerActionPathToParent(
+      const nsCString& aPath);
+  mozilla::ipc::IPCResult RecvOpenVRControllerManifestPathToParent(
+      const VRControllerType& aType, const nsCString& aPath);
+  mozilla::ipc::IPCResult RecvInitComplete();
+
+  mozilla::ipc::IPCResult RecvAddMemoryReport(const MemoryReport& aReport);
+
+ private:
+  ~VRChild();
+
+  VRProcessParent* mHost;
+  UniquePtr<MemoryReportRequestHost> mMemoryReportRequest;
+  bool mVRReady;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // GFX_VR_CHILD_H
diff --git a/gfx/vr/ipc/VRGPUChild.cpp b/gfx/vr/ipc/VRGPUChild.cpp
new file mode 100644
index 0000000000..793778c032
--- /dev/null
+++ b/gfx/vr/ipc/VRGPUChild.cpp
@@ -0,0 +1,86 @@
+/* -*- 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 "VRGPUChild.h"
+#include "VRServiceHost.h"
+
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/layers/CompositorThread.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "VRManager.h"
+
+namespace mozilla {
+namespace gfx {
+
+static StaticRefPtr<VRGPUChild> sVRGPUChildSingleton;
+
+/* static */
+bool VRGPUChild::InitForGPUProcess(Endpoint<PVRGPUChild>&& aEndpoint) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!sVRGPUChildSingleton);
+
+  if (!StaticPrefs::dom_vr_enabled() && !StaticPrefs::dom_vr_webxr_enabled()) {
+    return false;
+  }
+
+  RefPtr<VRGPUChild> child(new VRGPUChild());
+  if (!aEndpoint.Bind(child)) {
+    return false;
+  }
+  sVRGPUChildSingleton = child;
+
+#if !defined(MOZ_WIDGET_ANDROID)
+  RefPtr<Runnable> task = NS_NewRunnableFunction(
+      "VRServiceHost::NotifyVRProcessStarted", []() -> void {
+        VRServiceHost* host = VRServiceHost::Get();
+        host->NotifyVRProcessStarted();
+      });
+
+  NS_DispatchToMainThread(task.forget());
+#endif
+
+  return true;
+}
+
+/* static */
+bool VRGPUChild::IsCreated() { return !!sVRGPUChildSingleton; }
+
+/* static */
+VRGPUChild* VRGPUChild::Get() {
+  MOZ_ASSERT(IsCreated(), "VRGPUChild haven't initialized yet.");
+  return sVRGPUChildSingleton;
+}
+
+/*static*/
+void VRGPUChild::Shutdown() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (sVRGPUChildSingleton && !sVRGPUChildSingleton->IsClosed()) {
+    sVRGPUChildSingleton->Close();
+  }
+  sVRGPUChildSingleton = nullptr;
+}
+
+void VRGPUChild::ActorDestroy(ActorDestroyReason aWhy) {
+  VRManager* vm = VRManager::Get();
+  mozilla::layers::CompositorThread()->Dispatch(
+      NewRunnableMethod("VRGPUChild::ActorDestroy", vm, &VRManager::Shutdown));
+
+  mClosed = true;
+}
+
+mozilla::ipc::IPCResult VRGPUChild::RecvNotifyPuppetComplete() {
+#if !defined(MOZ_WIDGET_ANDROID)
+  VRManager* vm = VRManager::Get();
+  mozilla::layers::CompositorThread()->Dispatch(NewRunnableMethod(
+      "VRManager::NotifyPuppetComplete", vm, &VRManager::NotifyPuppetComplete));
+#endif
+  return IPC_OK();
+}
+
+bool VRGPUChild::IsClosed() { return mClosed; }
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRGPUChild.h b/gfx/vr/ipc/VRGPUChild.h
new file mode 100644
index 0000000000..38704bbc09
--- /dev/null
+++ b/gfx/vr/ipc/VRGPUChild.h
@@ -0,0 +1,43 @@
+/* -*- 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 GFX_VR_GPU_CHILD_H
+#define GFX_VR_GPU_CHILD_H
+
+#include "mozilla/gfx/PVRGPUChild.h"
+
+namespace mozilla {
+namespace gfx {
+
+class VRGPUChild final : public PVRGPUChild {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRGPUChild, final);
+
+  static VRGPUChild* Get();
+  static bool InitForGPUProcess(Endpoint<PVRGPUChild>&& aEndpoint);
+  static bool IsCreated();
+  static void Shutdown();
+
+  mozilla::ipc::IPCResult RecvNotifyPuppetComplete();
+  mozilla::ipc::IPCResult RecvNotifyServiceStarted();
+
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+  bool IsClosed();
+
+ protected:
+  explicit VRGPUChild() : mClosed(false) {}
+  ~VRGPUChild() = default;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VRGPUChild);
+
+  bool mClosed;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // GFX_VR_GPU_CHILD_H
diff --git a/gfx/vr/ipc/VRGPUParent.cpp b/gfx/vr/ipc/VRGPUParent.cpp
new file mode 100644
index 0000000000..44015928f4
--- /dev/null
+++ b/gfx/vr/ipc/VRGPUParent.cpp
@@ -0,0 +1,109 @@
+/* -*- 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 "VRGPUParent.h"
+#include "VRPuppetCommandBuffer.h"
+
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/ipc/ProcessChild.h"
+#include "mozilla/StaticPrefs_dom.h"
+
+namespace mozilla {
+namespace gfx {
+
+using namespace ipc;
+
+VRGPUParent::VRGPUParent(ProcessId aChildProcessId) : mClosed(false) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  SetOtherProcessId(aChildProcessId);
+}
+
+VRGPUParent::~VRGPUParent() = default;
+
+void VRGPUParent::ActorDestroy(ActorDestroyReason aWhy) {
+#if !defined(MOZ_WIDGET_ANDROID)
+  if (mVRService) {
+    mVRService->Stop();
+    mVRService = nullptr;
+  }
+#endif
+
+  mClosed = true;
+}
+
+/* static */
+RefPtr<VRGPUParent> VRGPUParent::CreateForGPU(
+    Endpoint<PVRGPUParent>&& aEndpoint) {
+  if (!StaticPrefs::dom_vr_enabled() && !StaticPrefs::dom_vr_webxr_enabled()) {
+    return nullptr;
+  }
+
+  RefPtr<VRGPUParent> vcp = new VRGPUParent(aEndpoint.OtherPid());
+  GetCurrentSerialEventTarget()->Dispatch(
+      NewRunnableMethod<Endpoint<PVRGPUParent>&&>("gfx::VRGPUParent::Bind", vcp,
+                                                  &VRGPUParent::Bind,
+                                                  std::move(aEndpoint)));
+
+  return vcp;
+}
+
+void VRGPUParent::Bind(Endpoint<PVRGPUParent>&& aEndpoint) {
+  if (!aEndpoint.Bind(this)) {
+    return;
+  }
+}
+
+mozilla::ipc::IPCResult VRGPUParent::RecvStartVRService() {
+#if !defined(MOZ_WIDGET_ANDROID)
+  mVRService = VRService::Create();
+  MOZ_ASSERT(mVRService);
+
+  mVRService->Start();
+#endif
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRGPUParent::RecvStopVRService() {
+#if !defined(MOZ_WIDGET_ANDROID)
+  if (mVRService) {
+    mVRService->Stop();
+    mVRService = nullptr;
+  }
+#endif
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRGPUParent::RecvPuppetReset() {
+#if !defined(MOZ_WIDGET_ANDROID)
+  VRPuppetCommandBuffer::Get().Reset();
+#endif
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRGPUParent::RecvPuppetSubmit(
+    const nsTArray<uint64_t>& aBuffer) {
+#if !defined(MOZ_WIDGET_ANDROID)
+  VRPuppetCommandBuffer::Get().Submit(aBuffer);
+#endif
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRGPUParent::RecvPuppetCheckForCompletion() {
+#if !defined(MOZ_WIDGET_ANDROID)
+  if (VRPuppetCommandBuffer::Get().HasEnded()) {
+    Unused << SendNotifyPuppetComplete();
+  }
+#endif
+  return IPC_OK();
+}
+
+bool VRGPUParent::IsClosed() { return mClosed; }
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRGPUParent.h b/gfx/vr/ipc/VRGPUParent.h
new file mode 100644
index 0000000000..dcb548af4c
--- /dev/null
+++ b/gfx/vr/ipc/VRGPUParent.h
@@ -0,0 +1,51 @@
+/* -*- 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 GFX_VR_GPU_PARENT_H
+#define GFX_VR_GPU_PARENT_H
+
+#include "mozilla/gfx/PVRGPUParent.h"
+#include "VRService.h"
+
+namespace mozilla {
+namespace gfx {
+
+class VRGPUParent final : public PVRGPUParent {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRGPUParent, final)
+
+  friend class PVRGPUParent;
+
+ public:
+  static RefPtr<VRGPUParent> CreateForGPU(Endpoint<PVRGPUParent>&& aEndpoint);
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+  bool IsClosed();
+
+ protected:
+  void Bind(Endpoint<PVRGPUParent>&& aEndpoint);
+  mozilla::ipc::IPCResult RecvStartVRService();
+  mozilla::ipc::IPCResult RecvStopVRService();
+  mozilla::ipc::IPCResult RecvPuppetReset();
+  mozilla::ipc::IPCResult RecvPuppetSubmit(const nsTArray<uint64_t>& aBuffer);
+  mozilla::ipc::IPCResult RecvPuppetCheckForCompletion();
+
+ private:
+  explicit VRGPUParent(ProcessId aChildProcessId);
+  ~VRGPUParent();
+
+  void DeferredDestroy();
+
+#if !defined(MOZ_WIDGET_ANDROID)
+  RefPtr<VRService> mVRService;
+#endif
+  bool mClosed;
+
+  DISALLOW_COPY_AND_ASSIGN(VRGPUParent);
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // GFX_VR_CONTENT_PARENT_H
diff --git a/gfx/vr/ipc/VRLayerChild.cpp b/gfx/vr/ipc/VRLayerChild.cpp
new file mode 100644
index 0000000000..57f69f7d2b
--- /dev/null
+++ b/gfx/vr/ipc/VRLayerChild.cpp
@@ -0,0 +1,151 @@
+/* -*- 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 "VRLayerChild.h"
+
+#include "mozilla/dom/HTMLCanvasElement.h"
+#include "mozilla/layers/ImageBridgeChild.h"
+#include "mozilla/layers/LayersMessages.h"  // for TimedTexture
+#include "mozilla/layers/SyncObject.h"      // for SyncObjectClient
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/StaticPrefs_webgl.h"
+
+#include "ClientWebGLContext.h"
+#include "gfxPlatform.h"
+#include "GLContext.h"
+#include "GLScreenBuffer.h"
+#include "SharedSurface.h"    // for SharedSurface
+#include "SharedSurfaceGL.h"  // for SharedSurface
+
+namespace mozilla::gfx {
+
+VRLayerChild::VRLayerChild() { MOZ_COUNT_CTOR(VRLayerChild); }
+
+VRLayerChild::~VRLayerChild() {
+  ClearSurfaces();
+
+  MOZ_COUNT_DTOR(VRLayerChild);
+}
+
+void VRLayerChild::Initialize(dom::HTMLCanvasElement* aCanvasElement,
+                              const gfx::Rect& aLeftEyeRect,
+                              const gfx::Rect& aRightEyeRect) {
+  MOZ_ASSERT(aCanvasElement);
+  mLeftEyeRect = aLeftEyeRect;
+  mRightEyeRect = aRightEyeRect;
+  mCanvasElement = aCanvasElement;
+}
+
+void VRLayerChild::SetXRFramebuffer(WebGLFramebufferJS* fb) {
+  mFramebuffer = fb;
+}
+
+static constexpr bool kIsAndroid =
+#if defined(MOZ_WIDGET_ANDROID)
+    true;
+#else
+    false;
+#endif
+
+void VRLayerChild::SubmitFrame(const VRDisplayInfo& aDisplayInfo) {
+  uint64_t frameId = aDisplayInfo.GetFrameId();
+
+  // aFrameId will not increment unless the previuosly submitted
+  // frame was received by the VR thread and submitted to the VR
+  // compositor.  We early-exit here in the event that SubmitFrame
+  // was called twice for the same aFrameId.
+  if (!mCanvasElement || frameId == mLastSubmittedFrameId) {
+    return;
+  }
+
+  const auto& webgl = mCanvasElement->GetWebGLContext();
+  if (!webgl) return;
+
+  // Keep the SharedSurfaceTextureClient alive long enough for
+  // 1 extra frame, accomodating overlapped asynchronous rendering.
+  mLastFrameTextureDesc = mThisFrameTextureDesc;
+
+  bool getNewFrame = true;
+  if (kIsAndroid) {
+    /**
+     * Do not blit WebGL to a SurfaceTexture until the last submitted frame is
+     * already processed and the new frame poses are ready. SurfaceTextures need
+     * to be released in the VR render thread in order to allow to be used again
+     * in the WebGLContext GLScreenBuffer producer. Not doing so causes some
+     * freezes, crashes or other undefined behaviour.
+     */
+    getNewFrame = (!mThisFrameTextureDesc ||
+                   aDisplayInfo.mDisplayState.lastSubmittedFrameId ==
+                       mLastSubmittedFrameId);
+  }
+  if (getNewFrame) {
+    const RefPtr<layers::ImageBridgeChild> imageBridge =
+        layers::ImageBridgeChild::GetSingleton();
+
+    auto texType = layers::TextureType::Unknown;
+    if (imageBridge) {
+      texType = layers::PreferredCanvasTextureType(imageBridge);
+    }
+    if (kIsAndroid && StaticPrefs::webgl_enable_surface_texture()) {
+      texType = layers::TextureType::AndroidNativeWindow;
+    }
+
+    webgl->Present(mFramebuffer, texType, true);
+    mThisFrameTextureDesc = webgl->GetFrontBuffer(mFramebuffer, true);
+  }
+
+  mLastSubmittedFrameId = frameId;
+
+  if (!mThisFrameTextureDesc) {
+    gfxCriticalError() << "ToSurfaceDescriptor failed in "
+                          "VRLayerChild::SubmitFrame";
+    return;
+  }
+
+  SendSubmitFrame(*mThisFrameTextureDesc, frameId, mLeftEyeRect, mRightEyeRect);
+}
+
+bool VRLayerChild::IsIPCOpen() { return mIPCOpen; }
+
+void VRLayerChild::ClearSurfaces() {
+  mThisFrameTextureDesc = Nothing();
+  mLastFrameTextureDesc = Nothing();
+  const auto& webgl = mCanvasElement->GetWebGLContext();
+  if (!mFramebuffer && webgl) {
+    webgl->ClearVRSwapChain();
+  }
+}
+
+void VRLayerChild::ActorDestroy(ActorDestroyReason aWhy) { mIPCOpen = false; }
+
+// static
+PVRLayerChild* VRLayerChild::CreateIPDLActor() {
+  if (!StaticPrefs::dom_vr_enabled() && !StaticPrefs::dom_vr_webxr_enabled()) {
+    return nullptr;
+  }
+
+  VRLayerChild* c = new VRLayerChild();
+  c->AddIPDLReference();
+  return c;
+}
+
+// static
+bool VRLayerChild::DestroyIPDLActor(PVRLayerChild* actor) {
+  static_cast<VRLayerChild*>(actor)->ReleaseIPDLReference();
+  return true;
+}
+
+void VRLayerChild::AddIPDLReference() {
+  MOZ_ASSERT(mIPCOpen == false);
+  mIPCOpen = true;
+  AddRef();
+}
+void VRLayerChild::ReleaseIPDLReference() {
+  MOZ_ASSERT(mIPCOpen == false);
+  Release();
+}
+
+}  // namespace mozilla::gfx
diff --git a/gfx/vr/ipc/VRLayerChild.h b/gfx/vr/ipc/VRLayerChild.h
new file mode 100644
index 0000000000..de91a46b87
--- /dev/null
+++ b/gfx/vr/ipc/VRLayerChild.h
@@ -0,0 +1,76 @@
+/* -*- 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 GFX_VR_LAYERCHILD_H
+#define GFX_VR_LAYERCHILD_H
+
+#include "VRManagerChild.h"
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/gfx/PVRLayerChild.h"
+#include "gfxVR.h"
+
+class nsICanvasRenderingContextInternal;
+
+namespace mozilla {
+class WebGLContext;
+class WebGLFramebufferJS;
+namespace dom {
+class HTMLCanvasElement;
+}
+namespace layers {
+class SharedSurfaceTextureClient;
+}
+namespace gl {
+class SurfaceFactory;
+}
+namespace gfx {
+
+class VRLayerChild : public PVRLayerChild {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRLayerChild)
+
+ public:
+  static PVRLayerChild* CreateIPDLActor();
+  static bool DestroyIPDLActor(PVRLayerChild* actor);
+
+  void Initialize(dom::HTMLCanvasElement* aCanvasElement,
+                  const gfx::Rect& aLeftEyeRect,
+                  const gfx::Rect& aRightEyeRect);
+  void SetXRFramebuffer(WebGLFramebufferJS*);
+  void SubmitFrame(const VRDisplayInfo& aDisplayInfo);
+  bool IsIPCOpen();
+
+ private:
+  VRLayerChild();
+  virtual ~VRLayerChild();
+  void ClearSurfaces();
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+
+  RefPtr<dom::HTMLCanvasElement> mCanvasElement;
+  bool mIPCOpen = false;
+
+  // AddIPDLReference and ReleaseIPDLReference are only to be called by
+  // CreateIPDLActor and DestroyIPDLActor, respectively. We intentionally make
+  // them private to prevent misuse. The purpose of these methods is to be aware
+  // of when the IPC system around this actor goes down: mIPCOpen is then set to
+  // false.
+  void AddIPDLReference();
+  void ReleaseIPDLReference();
+
+  gfx::Rect mLeftEyeRect;
+  gfx::Rect mRightEyeRect;
+  RefPtr<WebGLFramebufferJS> mFramebuffer;
+
+  Maybe<layers::SurfaceDescriptor> mThisFrameTextureDesc;
+  Maybe<layers::SurfaceDescriptor> mLastFrameTextureDesc;
+
+  uint64_t mLastSubmittedFrameId = 0;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif
diff --git a/gfx/vr/ipc/VRLayerParent.cpp b/gfx/vr/ipc/VRLayerParent.cpp
new file mode 100644
index 0000000000..b75a151027
--- /dev/null
+++ b/gfx/vr/ipc/VRLayerParent.cpp
@@ -0,0 +1,55 @@
+/* -*- 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 "VRLayerParent.h"
+#include "VRManager.h"
+#include "mozilla/Unused.h"
+#include "mozilla/layers/CompositorThread.h"
+
+namespace mozilla {
+using namespace layers;
+namespace gfx {
+
+VRLayerParent::VRLayerParent(uint32_t aVRDisplayID, const uint32_t aGroup)
+    : mIPCOpen(true), mDestroyed(false), mGroup(aGroup) {}
+
+VRLayerParent::~VRLayerParent() {
+  Destroy();
+  MOZ_COUNT_DTOR(VRLayerParent);
+}
+
+mozilla::ipc::IPCResult VRLayerParent::RecvDestroy() {
+  Destroy();
+  return IPC_OK();
+}
+
+void VRLayerParent::ActorDestroy(ActorDestroyReason aWhy) { mIPCOpen = false; }
+
+void VRLayerParent::Destroy() {
+  if (!mDestroyed) {
+    VRManager* vm = VRManager::Get();
+    vm->RemoveLayer(this);
+    mDestroyed = true;
+  }
+
+  if (mIPCOpen) {
+    Unused << PVRLayerParent::Send__delete__(this);
+  }
+}
+
+mozilla::ipc::IPCResult VRLayerParent::RecvSubmitFrame(
+    const layers::SurfaceDescriptor& aTexture, const uint64_t& aFrameId,
+    const gfx::Rect& aLeftEyeRect, const gfx::Rect& aRightEyeRect) {
+  if (!mDestroyed) {
+    VRManager* vm = VRManager::Get();
+    vm->SubmitFrame(this, aTexture, aFrameId, aLeftEyeRect, aRightEyeRect);
+  }
+
+  return IPC_OK();
+}
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRLayerParent.h b/gfx/vr/ipc/VRLayerParent.h
new file mode 100644
index 0000000000..559ee1c7de
--- /dev/null
+++ b/gfx/vr/ipc/VRLayerParent.h
@@ -0,0 +1,45 @@
+/* -*- 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 GFX_VR_LAYERPARENT_H
+#define GFX_VR_LAYERPARENT_H
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/gfx/PVRLayerParent.h"
+#include "gfxVR.h"
+
+namespace mozilla {
+namespace gfx {
+
+class VRLayerParent : public PVRLayerParent {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRLayerParent)
+
+ public:
+  VRLayerParent(uint32_t aVRDisplayID, const uint32_t aGroup);
+  virtual mozilla::ipc::IPCResult RecvSubmitFrame(
+      const layers::SurfaceDescriptor& aTexture, const uint64_t& aFrameId,
+      const gfx::Rect& aLeftEyeRect, const gfx::Rect& aRightEyeRect) override;
+  virtual mozilla::ipc::IPCResult RecvDestroy() override;
+  uint32_t GetGroup() const { return mGroup; }
+
+ protected:
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+
+  virtual ~VRLayerParent();
+  void Destroy();
+
+  bool mIPCOpen;
+
+  bool mDestroyed;
+  gfx::Rect mLeftEyeRect;
+  gfx::Rect mRightEyeRect;
+  uint32_t mGroup;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif
diff --git a/gfx/vr/ipc/VRManagerChild.cpp b/gfx/vr/ipc/VRManagerChild.cpp
new file mode 100644
index 0000000000..9bfc74e3af
--- /dev/null
+++ b/gfx/vr/ipc/VRManagerChild.cpp
@@ -0,0 +1,628 @@
+/* -*- 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 "VRManagerChild.h"
+
+#include "VRLayerChild.h"
+#include "VRManagerParent.h"
+#include "VRThread.h"
+#include "VRDisplayClient.h"
+#include "nsGlobalWindow.h"
+#include "mozilla/ProfilerMarkers.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/layers/CompositorThread.h"  // for CompositorThread
+#include "mozilla/dom/Navigator.h"
+#include "mozilla/dom/VREventObserver.h"
+#include "mozilla/dom/WebXRBinding.h"
+#include "mozilla/dom/WindowBinding.h"  // for FrameRequestCallback
+#include "mozilla/dom/XRSystem.h"
+#include "mozilla/dom/XRFrame.h"
+#include "mozilla/dom/ContentChild.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/GamepadManager.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/layers/SyncObject.h"
+#include "mozilla/layers/TextureForwarder.h"
+
+using namespace mozilla::dom;
+
+namespace {
+const nsTArray<RefPtr<mozilla::gfx::VRManagerEventObserver>>::index_type
+    kNoIndex = nsTArray<RefPtr<mozilla::gfx::VRManagerEventObserver>>::NoIndex;
+}  // namespace
+
+namespace mozilla {
+namespace gfx {
+
+static StaticRefPtr<VRManagerChild> sVRManagerChildSingleton;
+static StaticRefPtr<VRManagerParent> sVRManagerParentSingleton;
+
+static TimeStamp sMostRecentFrameEnd;
+static TimeDuration sAverageFrameInterval;
+
+void ReleaseVRManagerParentSingleton() { sVRManagerParentSingleton = nullptr; }
+
+VRManagerChild::VRManagerChild()
+    : mRuntimeCapabilities(VRDisplayCapabilityFlags::Cap_None),
+      mFrameRequestCallbackCounter(0),
+      mWaitingForEnumeration(false),
+      mBackend(layers::LayersBackend::LAYERS_NONE) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  mStartTimeStamp = TimeStamp::Now();
+}
+
+VRManagerChild::~VRManagerChild() { MOZ_ASSERT(NS_IsMainThread()); }
+
+/*static*/
+void VRManagerChild::IdentifyTextureHost(
+    const TextureFactoryIdentifier& aIdentifier) {
+  if (sVRManagerChildSingleton) {
+    sVRManagerChildSingleton->mBackend = aIdentifier.mParentBackend;
+  }
+}
+
+layers::LayersBackend VRManagerChild::GetBackendType() const {
+  return mBackend;
+}
+
+/*static*/
+VRManagerChild* VRManagerChild::Get() {
+  MOZ_ASSERT(sVRManagerChildSingleton);
+  return sVRManagerChildSingleton;
+}
+
+/* static */
+bool VRManagerChild::IsCreated() { return !!sVRManagerChildSingleton; }
+
+/* static */
+bool VRManagerChild::IsPresenting() {
+  if (!VRManagerChild::IsCreated()) {
+    return false;
+  }
+
+  nsTArray<RefPtr<VRDisplayClient>> displays;
+  sVRManagerChildSingleton->GetVRDisplays(displays);
+
+  bool result = false;
+  for (auto& display : displays) {
+    result |= display->IsPresenting();
+  }
+  return result;
+}
+
+TimeStamp VRManagerChild::GetIdleDeadlineHint(TimeStamp aDefault) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!VRManagerChild::IsCreated() || sMostRecentFrameEnd.IsNull()) {
+    return aDefault;
+  }
+
+  TimeStamp idleEnd = sMostRecentFrameEnd + sAverageFrameInterval;
+  return idleEnd < aDefault ? idleEnd : aDefault;
+}
+
+/* static */
+bool VRManagerChild::InitForContent(Endpoint<PVRManagerChild>&& aEndpoint) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<VRManagerChild> child(new VRManagerChild());
+  if (!aEndpoint.Bind(child)) {
+    return false;
+  }
+  sVRManagerChildSingleton = child;
+  return true;
+}
+
+/*static*/
+void VRManagerChild::InitSameProcess() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!sVRManagerChildSingleton);
+
+  sVRManagerChildSingleton = new VRManagerChild();
+  sVRManagerParentSingleton = VRManagerParent::CreateSameProcess();
+  sVRManagerChildSingleton->Open(sVRManagerParentSingleton, CompositorThread(),
+                                 mozilla::ipc::ChildSide);
+}
+
+/* static */
+void VRManagerChild::InitWithGPUProcess(Endpoint<PVRManagerChild>&& aEndpoint) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!sVRManagerChildSingleton);
+
+  sVRManagerChildSingleton = new VRManagerChild();
+  if (!aEndpoint.Bind(sVRManagerChildSingleton)) {
+    MOZ_CRASH("Couldn't Open() Compositor channel.");
+  }
+}
+
+/*static*/
+void VRManagerChild::ShutDown() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!sVRManagerChildSingleton) {
+    return;
+  }
+  sVRManagerChildSingleton->Close();
+  sVRManagerChildSingleton = nullptr;
+}
+
+void VRManagerChild::ActorDestroy(ActorDestroyReason aReason) {
+  if (sVRManagerChildSingleton == this) {
+    sVRManagerChildSingleton = nullptr;
+  }
+}
+
+PVRLayerChild* VRManagerChild::AllocPVRLayerChild(const uint32_t& aDisplayID,
+                                                  const uint32_t& aGroup) {
+  return VRLayerChild::CreateIPDLActor();
+}
+
+bool VRManagerChild::DeallocPVRLayerChild(PVRLayerChild* actor) {
+  return VRLayerChild::DestroyIPDLActor(actor);
+}
+
+void VRManagerChild::UpdateDisplayInfo(const VRDisplayInfo& aDisplayInfo) {
+  nsTArray<uint32_t> disconnectedDisplays;
+  nsTArray<uint32_t> connectedDisplays;
+
+  const nsTArray<RefPtr<VRDisplayClient>> prevDisplays(mDisplays.Clone());
+
+  // Check if any displays have been disconnected
+  for (auto& display : prevDisplays) {
+    bool found = false;
+    if (aDisplayInfo.GetDisplayID() != 0) {
+      if (display->GetDisplayInfo().GetDisplayID() ==
+          aDisplayInfo.GetDisplayID()) {
+        found = true;
+        break;
+      }
+    }
+    if (!found) {
+      // In order to make the current VRDisplay can continue to apply for the
+      // newest VRDisplayInfo, we need to exit presentionation before
+      // disconnecting.
+      if (display->IsPresentationGenerationCurrent()) {
+        NotifyPresentationGenerationChangedInternal(
+            display->GetDisplayInfo().GetDisplayID());
+
+        RefPtr<VRManagerChild> vm = VRManagerChild::Get();
+        vm->FireDOMVRDisplayPresentChangeEvent(
+            display->GetDisplayInfo().GetDisplayID());
+      }
+      display->NotifyDisconnected();
+      disconnectedDisplays.AppendElement(
+          display->GetDisplayInfo().GetDisplayID());
+    }
+  }
+
+  // mDisplays could be a hashed container for more scalability, but not worth
+  // it now as we expect < 10 entries.
+  nsTArray<RefPtr<VRDisplayClient>> displays;
+  if (aDisplayInfo.GetDisplayID() != 0) {
+    bool isNewDisplay = true;
+    for (auto& display : prevDisplays) {
+      const VRDisplayInfo& prevInfo = display->GetDisplayInfo();
+      if (prevInfo.GetDisplayID() == aDisplayInfo.GetDisplayID()) {
+        if (aDisplayInfo.GetIsConnected() && !prevInfo.GetIsConnected()) {
+          connectedDisplays.AppendElement(aDisplayInfo.GetDisplayID());
+        }
+        if (!aDisplayInfo.GetIsConnected() && prevInfo.GetIsConnected()) {
+          disconnectedDisplays.AppendElement(aDisplayInfo.GetDisplayID());
+        }
+        // MOZ_KnownLive because 'prevDisplays' is guaranteed to keep it alive.
+        //
+        // This can go away once
+        // https://bugzilla.mozilla.org/show_bug.cgi?id=1620312 is fixed.
+        MOZ_KnownLive(display)->UpdateDisplayInfo(aDisplayInfo);
+        displays.AppendElement(display);
+        isNewDisplay = false;
+        break;
+      }
+    }
+    if (isNewDisplay) {
+      displays.AppendElement(new VRDisplayClient(aDisplayInfo));
+      connectedDisplays.AppendElement(aDisplayInfo.GetDisplayID());
+    }
+  }
+
+  mDisplays = std::move(displays);
+
+  // We wish to fire the events only after mDisplays is updated
+  for (uint32_t displayID : disconnectedDisplays) {
+    FireDOMVRDisplayDisconnectEvent(displayID);
+  }
+
+  for (uint32_t displayID : connectedDisplays) {
+    FireDOMVRDisplayConnectEvent(displayID);
+  }
+}
+
+bool VRManagerChild::RuntimeSupportsVR() const {
+  return bool(mRuntimeCapabilities & VRDisplayCapabilityFlags::Cap_ImmersiveVR);
+}
+bool VRManagerChild::RuntimeSupportsAR() const {
+  return bool(mRuntimeCapabilities & VRDisplayCapabilityFlags::Cap_ImmersiveAR);
+}
+bool VRManagerChild::RuntimeSupportsInline() const {
+  return bool(mRuntimeCapabilities & VRDisplayCapabilityFlags::Cap_Inline);
+}
+
+mozilla::ipc::IPCResult VRManagerChild::RecvUpdateRuntimeCapabilities(
+    const VRDisplayCapabilityFlags& aCapabilities) {
+  mRuntimeCapabilities = aCapabilities;
+  nsContentUtils::AddScriptRunner(NewRunnableMethod<>(
+      "gfx::VRManagerChild::NotifyRuntimeCapabilitiesUpdatedInternal", this,
+      &VRManagerChild::NotifyRuntimeCapabilitiesUpdatedInternal));
+  return IPC_OK();
+}
+
+void VRManagerChild::NotifyRuntimeCapabilitiesUpdatedInternal() {
+  const nsTArray<RefPtr<VRManagerEventObserver>> listeners = mListeners.Clone();
+  for (auto& listener : listeners) {
+    listener->NotifyDetectRuntimesCompleted();
+  }
+}
+
+mozilla::ipc::IPCResult VRManagerChild::RecvUpdateDisplayInfo(
+    const VRDisplayInfo& aDisplayInfo) {
+  UpdateDisplayInfo(aDisplayInfo);
+  for (auto& windowId : mNavigatorCallbacks) {
+    /** We must call NotifyVRDisplaysUpdated for every
+     * window's Navigator in mNavigatorCallbacks to ensure that
+     * the promise returned by Navigator.GetVRDevices
+     * can resolve.  This must happen even if no changes
+     * to VRDisplays have been detected here.
+     */
+    nsGlobalWindowInner* window =
+        nsGlobalWindowInner::GetInnerWindowWithId(windowId);
+    if (!window) {
+      continue;
+    }
+    dom::Navigator* nav = window->Navigator();
+    if (!nav) {
+      continue;
+    }
+    nav->NotifyVRDisplaysUpdated();
+  }
+  mNavigatorCallbacks.Clear();
+  if (mWaitingForEnumeration) {
+    nsContentUtils::AddScriptRunner(NewRunnableMethod<>(
+        "gfx::VRManagerChild::NotifyEnumerationCompletedInternal", this,
+        &VRManagerChild::NotifyEnumerationCompletedInternal));
+    mWaitingForEnumeration = false;
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerChild::RecvNotifyPuppetCommandBufferCompleted(
+    bool aSuccess) {
+  RefPtr<dom::Promise> promise = mRunPuppetPromise;
+  mRunPuppetPromise = nullptr;
+  if (aSuccess) {
+    promise->MaybeResolve(JS::UndefinedHandleValue);
+  } else {
+    promise->MaybeRejectWithUndefined();
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerChild::RecvNotifyPuppetResetComplete() {
+  nsTArray<RefPtr<dom::Promise>> promises;
+  promises.AppendElements(mResetPuppetPromises);
+  mResetPuppetPromises.Clear();
+  for (const auto& promise : promises) {
+    promise->MaybeResolve(JS::UndefinedHandleValue);
+  }
+  return IPC_OK();
+}
+
+void VRManagerChild::RunPuppet(const nsTArray<uint64_t>& aBuffer,
+                               dom::Promise* aPromise, ErrorResult& aRv) {
+  if (mRunPuppetPromise) {
+    // We only allow one puppet script to run simultaneously.
+    // The prior promise must be resolved before running a new
+    // script.
+    aRv.Throw(NS_ERROR_INVALID_ARG);
+    return;
+  }
+  if (!SendRunPuppet(aBuffer)) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+  mRunPuppetPromise = aPromise;
+}
+
+void VRManagerChild::ResetPuppet(dom::Promise* aPromise, ErrorResult& aRv) {
+  if (!SendResetPuppet()) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+  mResetPuppetPromises.AppendElement(aPromise);
+}
+
+void VRManagerChild::GetVRDisplays(
+    nsTArray<RefPtr<VRDisplayClient>>& aDisplays) {
+  aDisplays = mDisplays.Clone();
+}
+
+bool VRManagerChild::RefreshVRDisplaysWithCallback(uint64_t aWindowId) {
+  bool success = SendRefreshDisplays();
+  if (success) {
+    mNavigatorCallbacks.AppendElement(aWindowId);
+  }
+  return success;
+}
+
+bool VRManagerChild::EnumerateVRDisplays() {
+  bool success = SendRefreshDisplays();
+  if (success) {
+    mWaitingForEnumeration = true;
+  }
+  return success;
+}
+
+void VRManagerChild::DetectRuntimes() { Unused << SendDetectRuntimes(); }
+
+PVRLayerChild* VRManagerChild::CreateVRLayer(uint32_t aDisplayID,
+                                             uint32_t aGroup) {
+  PVRLayerChild* vrLayerChild = AllocPVRLayerChild(aDisplayID, aGroup);
+  return SendPVRLayerConstructor(vrLayerChild, aDisplayID, aGroup);
+}
+
+void VRManagerChild::XRFrameRequest::Call(
+    const DOMHighResTimeStamp& aTimeStamp) {
+  if (mCallback) {
+    RefPtr<mozilla::dom::FrameRequestCallback> callback = mCallback;
+    callback->Call(aTimeStamp);
+  } else {
+    RefPtr<mozilla::dom::XRFrameRequestCallback> callback = mXRCallback;
+    RefPtr<mozilla::dom::XRFrame> frame = mXRFrame;
+    callback->Call(aTimeStamp, *frame);
+  }
+}
+
+nsresult VRManagerChild::ScheduleFrameRequestCallback(
+    mozilla::dom::FrameRequestCallback& aCallback, int32_t* aHandle) {
+  if (mFrameRequestCallbackCounter == INT32_MAX) {
+    // Can't increment without overflowing; bail out
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  int32_t newHandle = ++mFrameRequestCallbackCounter;
+
+  mFrameRequestCallbacks.AppendElement(XRFrameRequest(aCallback, newHandle));
+
+  *aHandle = newHandle;
+  return NS_OK;
+}
+
+void VRManagerChild::CancelFrameRequestCallback(int32_t aHandle) {
+  // mFrameRequestCallbacks is stored sorted by handle
+  mFrameRequestCallbacks.RemoveElementSorted(aHandle);
+}
+
+void VRManagerChild::RunFrameRequestCallbacks() {
+  AUTO_PROFILER_TRACING_MARKER("VR", "RunFrameRequestCallbacks", GRAPHICS);
+
+  TimeStamp nowTime = TimeStamp::Now();
+  mozilla::TimeDuration duration = nowTime - mStartTimeStamp;
+  DOMHighResTimeStamp timeStamp = duration.ToMilliseconds();
+
+  if (!sMostRecentFrameEnd.IsNull()) {
+    TimeDuration frameInterval = nowTime - sMostRecentFrameEnd;
+    if (sAverageFrameInterval.IsZero()) {
+      sAverageFrameInterval = frameInterval;
+    } else {
+      // Calculate the average interval between frame end and next frame start.
+      // Apply some smoothing to make it more stable.
+      const double smooth = 0.9;
+      sAverageFrameInterval = sAverageFrameInterval.MultDouble(smooth) +
+                              frameInterval.MultDouble(1.0 - smooth);
+    }
+  }
+
+  nsTArray<XRFrameRequest> callbacks;
+  callbacks.AppendElements(mFrameRequestCallbacks);
+  mFrameRequestCallbacks.Clear();
+  for (auto& callback : callbacks) {
+    // The FrameRequest copied into the on-stack array holds a strong ref to its
+    // mCallback and there's nothing that can drop that ref until we return.
+    MOZ_KnownLive(callback.mCallback)->Call(timeStamp);
+  }
+
+  if (IsPresenting()) {
+    sMostRecentFrameEnd = TimeStamp::Now();
+  }
+}
+
+void VRManagerChild::NotifyPresentationGenerationChanged(uint32_t aDisplayID) {
+  nsContentUtils::AddScriptRunner(NewRunnableMethod<uint32_t>(
+      "gfx::VRManagerChild::NotifyPresentationGenerationChangedInternal", this,
+      &VRManagerChild::NotifyPresentationGenerationChangedInternal,
+      aDisplayID));
+}
+
+void VRManagerChild::FireDOMVRDisplayMountedEvent(uint32_t aDisplayID) {
+  nsContentUtils::AddScriptRunner(NewRunnableMethod<uint32_t>(
+      "gfx::VRManagerChild::FireDOMVRDisplayMountedEventInternal", this,
+      &VRManagerChild::FireDOMVRDisplayMountedEventInternal, aDisplayID));
+}
+
+void VRManagerChild::FireDOMVRDisplayUnmountedEvent(uint32_t aDisplayID) {
+  nsContentUtils::AddScriptRunner(NewRunnableMethod<uint32_t>(
+      "gfx::VRManagerChild::FireDOMVRDisplayUnmountedEventInternal", this,
+      &VRManagerChild::FireDOMVRDisplayUnmountedEventInternal, aDisplayID));
+}
+
+void VRManagerChild::FireDOMVRDisplayConnectEvent(uint32_t aDisplayID) {
+  nsContentUtils::AddScriptRunner(NewRunnableMethod<uint32_t>(
+      "gfx::VRManagerChild::FireDOMVRDisplayConnectEventInternal", this,
+      &VRManagerChild::FireDOMVRDisplayConnectEventInternal, aDisplayID));
+}
+
+void VRManagerChild::FireDOMVRDisplayDisconnectEvent(uint32_t aDisplayID) {
+  nsContentUtils::AddScriptRunner(NewRunnableMethod<uint32_t>(
+      "gfx::VRManagerChild::FireDOMVRDisplayDisconnectEventInternal", this,
+      &VRManagerChild::FireDOMVRDisplayDisconnectEventInternal, aDisplayID));
+}
+
+void VRManagerChild::FireDOMVRDisplayPresentChangeEvent(uint32_t aDisplayID) {
+  nsContentUtils::AddScriptRunner(NewRunnableMethod<uint32_t>(
+      "gfx::VRManagerChild::FireDOMVRDisplayPresentChangeEventInternal", this,
+      &VRManagerChild::FireDOMVRDisplayPresentChangeEventInternal, aDisplayID));
+
+  if (!IsPresenting()) {
+    sMostRecentFrameEnd = TimeStamp();
+    sAverageFrameInterval = 0;
+  }
+}
+
+void VRManagerChild::FireDOMVRDisplayMountedEventInternal(uint32_t aDisplayID) {
+  // Iterate over a copy of mListeners, as dispatched events may modify it.
+  for (auto& listener : mListeners.Clone()) {
+    listener->NotifyVRDisplayMounted(aDisplayID);
+  }
+}
+
+void VRManagerChild::FireDOMVRDisplayUnmountedEventInternal(
+    uint32_t aDisplayID) {
+  // Iterate over a copy of mListeners, as dispatched events may modify it.
+  for (auto& listener : mListeners.Clone()) {
+    listener->NotifyVRDisplayUnmounted(aDisplayID);
+  }
+}
+
+void VRManagerChild::FireDOMVRDisplayConnectEventInternal(uint32_t aDisplayID) {
+  // Iterate over a copy of mListeners, as dispatched events may modify it.
+  for (auto& listener : mListeners.Clone()) {
+    listener->NotifyVRDisplayConnect(aDisplayID);
+  }
+}
+
+void VRManagerChild::FireDOMVRDisplayDisconnectEventInternal(
+    uint32_t aDisplayID) {
+  // Iterate over a copy of mListeners, as dispatched events may modify it.
+  for (auto& listener : mListeners.Clone()) {
+    listener->NotifyVRDisplayDisconnect(aDisplayID);
+  }
+}
+
+void VRManagerChild::FireDOMVRDisplayPresentChangeEventInternal(
+    uint32_t aDisplayID) {
+  // Iterate over a copy of mListeners, as dispatched events may modify it.
+  for (auto& listener : mListeners.Clone()) {
+    // MOZ_KnownLive because 'listeners' is guaranteed to keep it alive.
+    //
+    // This can go away once
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=1620312 is fixed.
+    MOZ_KnownLive(listener)->NotifyVRDisplayPresentChange(aDisplayID);
+  }
+}
+
+void VRManagerChild::FireDOMVRDisplayConnectEventsForLoadInternal(
+    uint32_t aDisplayID, VRManagerEventObserver* aObserver) {
+  aObserver->NotifyVRDisplayConnect(aDisplayID);
+}
+
+void VRManagerChild::NotifyPresentationGenerationChangedInternal(
+    uint32_t aDisplayID) {
+  for (auto& listener : mListeners.Clone()) {
+    listener->NotifyPresentationGenerationChanged(aDisplayID);
+  }
+}
+
+void VRManagerChild::NotifyEnumerationCompletedInternal() {
+  for (auto& listener : mListeners.Clone()) {
+    listener->NotifyEnumerationCompleted();
+  }
+}
+
+void VRManagerChild::FireDOMVRDisplayConnectEventsForLoad(
+    VRManagerEventObserver* aObserver) {
+  // We need to fire the VRDisplayConnect event when a page is loaded
+  // for each VR Display that has already been enumerated
+  for (const auto& display : mDisplays.Clone()) {
+    const VRDisplayInfo& info = display->GetDisplayInfo();
+    if (info.GetIsConnected()) {
+      nsContentUtils::AddScriptRunner(NewRunnableMethod<
+                                      uint32_t, RefPtr<VRManagerEventObserver>>(
+          "gfx::VRManagerChild::FireDOMVRDisplayConnectEventsForLoadInternal",
+          this, &VRManagerChild::FireDOMVRDisplayConnectEventsForLoadInternal,
+          info.GetDisplayID(), aObserver));
+    }
+  }
+}
+
+void VRManagerChild::AddListener(VRManagerEventObserver* aObserver) {
+  MOZ_ASSERT(aObserver);
+
+  if (mListeners.IndexOf(aObserver) != kNoIndex) {
+    return;  // already exists
+  }
+
+  mListeners.AppendElement(aObserver);
+  if (mListeners.Length() == 1) {
+    Unused << SendSetHaveEventListener(true);
+  }
+}
+
+void VRManagerChild::RemoveListener(VRManagerEventObserver* aObserver) {
+  MOZ_ASSERT(aObserver);
+
+  mListeners.RemoveElement(aObserver);
+  if (mListeners.IsEmpty()) {
+    Unused << SendSetHaveEventListener(false);
+  }
+}
+
+void VRManagerChild::StartActivity() { Unused << SendStartActivity(); }
+
+void VRManagerChild::StopActivity() {
+  for (auto& listener : mListeners) {
+    if (!listener->GetStopActivityStatus()) {
+      // We are still showing VR in the active window.
+      return;
+    }
+  }
+
+  Unused << SendStopActivity();
+}
+
+void VRManagerChild::HandleFatalError(const char* aMsg) {
+  dom::ContentChild::FatalErrorIfNotUsingGPUProcess(aMsg, OtherPid());
+}
+
+void VRManagerChild::AddPromise(const uint32_t& aID, dom::Promise* aPromise) {
+  MOZ_ASSERT(!mGamepadPromiseList.Contains(aID));
+  mGamepadPromiseList.InsertOrUpdate(aID, RefPtr{aPromise});
+}
+
+gfx::VRAPIMode VRManagerChild::GetVRAPIMode(uint32_t aDisplayID) const {
+  for (auto& display : mDisplays) {
+    if (display->GetDisplayInfo().GetDisplayID() == aDisplayID) {
+      return display->GetXRAPIMode();
+    }
+  }
+  return VRAPIMode::WebXR;
+}
+
+mozilla::ipc::IPCResult VRManagerChild::RecvReplyGamepadVibrateHaptic(
+    const uint32_t& aPromiseID) {
+  // VRManagerChild could be at other processes, but GamepadManager
+  // only exists at the content process or the same process
+  // in non-e10s mode.
+  MOZ_ASSERT(XRE_IsContentProcess() || IsSameProcess());
+
+  RefPtr<dom::Promise> p;
+  if (!mGamepadPromiseList.Get(aPromiseID, getter_AddRefs(p))) {
+    MOZ_CRASH("We should always have a promise.");
+  }
+
+  p->MaybeResolve(true);
+  mGamepadPromiseList.Remove(aPromiseID);
+  return IPC_OK();
+}
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRManagerChild.h b/gfx/vr/ipc/VRManagerChild.h
new file mode 100644
index 0000000000..7448007c07
--- /dev/null
+++ b/gfx/vr/ipc/VRManagerChild.h
@@ -0,0 +1,197 @@
+/* -*- 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 MOZILLA_GFX_VR_VRMANAGERCHILD_H
+#define MOZILLA_GFX_VR_VRMANAGERCHILD_H
+
+#include "nsISupportsImpl.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/AnimationFrameProviderBinding.h"
+#include "mozilla/dom/WebXRBinding.h"
+#include "mozilla/dom/XRFrame.h"
+#include "mozilla/gfx/PVRManagerChild.h"
+#include "mozilla/ipc/SharedMemory.h"          // for SharedMemory, etc
+#include "mozilla/layers/ISurfaceAllocator.h"  // for ISurfaceAllocator
+#include "mozilla/layers/LayersTypes.h"        // for LayersBackend
+
+namespace mozilla {
+namespace dom {
+class Promise;
+class GamepadManager;
+class Navigator;
+class VRDisplay;
+class FrameRequestCallback;
+}  // namespace dom
+namespace gfx {
+class VRLayerChild;
+class VRDisplayClient;
+
+class VRManagerEventObserver {
+ public:
+  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
+  virtual void NotifyVRDisplayMounted(uint32_t aDisplayID) = 0;
+  virtual void NotifyVRDisplayUnmounted(uint32_t aDisplayID) = 0;
+  virtual void NotifyVRDisplayConnect(uint32_t aDisplayID) = 0;
+  virtual void NotifyVRDisplayDisconnect(uint32_t aDisplayID) = 0;
+  virtual void NotifyVRDisplayPresentChange(uint32_t aDisplayID) = 0;
+  virtual void NotifyPresentationGenerationChanged(uint32_t aDisplayID) = 0;
+  virtual bool GetStopActivityStatus() const = 0;
+  virtual void NotifyEnumerationCompleted() = 0;
+  virtual void NotifyDetectRuntimesCompleted() = 0;
+
+ protected:
+  virtual ~VRManagerEventObserver() = default;
+};
+
+class VRManagerChild : public PVRManagerChild {
+  friend class PVRManagerChild;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRManagerChild, override);
+
+  static VRManagerChild* Get();
+
+  // Indicate that an observer wants to receive VR events.
+  void AddListener(VRManagerEventObserver* aObserver);
+  // Indicate that an observer should no longer receive VR events.
+  void RemoveListener(VRManagerEventObserver* aObserver);
+  void StartActivity();
+  void StopActivity();
+  bool RuntimeSupportsVR() const;
+  bool RuntimeSupportsAR() const;
+  bool RuntimeSupportsInline() const;
+
+  void GetVRDisplays(nsTArray<RefPtr<VRDisplayClient>>& aDisplays);
+  bool RefreshVRDisplaysWithCallback(uint64_t aWindowId);
+  bool EnumerateVRDisplays();
+  void DetectRuntimes();
+  void AddPromise(const uint32_t& aID, dom::Promise* aPromise);
+  gfx::VRAPIMode GetVRAPIMode(uint32_t aDisplayID) const;
+
+  static void InitSameProcess();
+  static void InitWithGPUProcess(Endpoint<PVRManagerChild>&& aEndpoint);
+  static bool InitForContent(Endpoint<PVRManagerChild>&& aEndpoint);
+  static void ShutDown();
+
+  static bool IsCreated();
+  static bool IsPresenting();
+  static TimeStamp GetIdleDeadlineHint(TimeStamp aDefault);
+
+  PVRLayerChild* CreateVRLayer(uint32_t aDisplayID, uint32_t aGroup);
+
+  static void IdentifyTextureHost(
+      const layers::TextureFactoryIdentifier& aIdentifier);
+  layers::LayersBackend GetBackendType() const;
+
+  nsresult ScheduleFrameRequestCallback(dom::FrameRequestCallback& aCallback,
+                                        int32_t* aHandle);
+  void CancelFrameRequestCallback(int32_t aHandle);
+  MOZ_CAN_RUN_SCRIPT
+  void RunFrameRequestCallbacks();
+  void NotifyPresentationGenerationChanged(uint32_t aDisplayID);
+
+  MOZ_CAN_RUN_SCRIPT
+  void UpdateDisplayInfo(const VRDisplayInfo& aDisplayInfo);
+  void FireDOMVRDisplayMountedEvent(uint32_t aDisplayID);
+  void FireDOMVRDisplayUnmountedEvent(uint32_t aDisplayID);
+  void FireDOMVRDisplayConnectEvent(uint32_t aDisplayID);
+  void FireDOMVRDisplayDisconnectEvent(uint32_t aDisplayID);
+  void FireDOMVRDisplayPresentChangeEvent(uint32_t aDisplayID);
+  void FireDOMVRDisplayConnectEventsForLoad(VRManagerEventObserver* aObserver);
+
+  void HandleFatalError(const char* aMsg) override;
+  void ActorDestroy(ActorDestroyReason aReason) override;
+
+  void RunPuppet(const nsTArray<uint64_t>& aBuffer, dom::Promise* aPromise,
+                 ErrorResult& aRv);
+  void ResetPuppet(dom::Promise* aPromise, ErrorResult& aRv);
+
+ protected:
+  explicit VRManagerChild();
+  ~VRManagerChild();
+
+  PVRLayerChild* AllocPVRLayerChild(const uint32_t& aDisplayID,
+                                    const uint32_t& aGroup);
+  bool DeallocPVRLayerChild(PVRLayerChild* actor);
+
+  // MOZ_CAN_RUN_SCRIPT_BOUNDARY until we can mark ipdl-generated things as
+  // MOZ_CAN_RUN_SCRIPT.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  mozilla::ipc::IPCResult RecvUpdateDisplayInfo(
+      const VRDisplayInfo& aDisplayInfo);
+  mozilla::ipc::IPCResult RecvUpdateRuntimeCapabilities(
+      const VRDisplayCapabilityFlags& aCapabilities);
+  mozilla::ipc::IPCResult RecvReplyGamepadVibrateHaptic(
+      const uint32_t& aPromiseID);
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  mozilla::ipc::IPCResult RecvNotifyPuppetCommandBufferCompleted(bool aSuccess);
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  mozilla::ipc::IPCResult RecvNotifyPuppetResetComplete();
+
+  bool IsSameProcess() const { return OtherPid() == base::GetCurrentProcId(); }
+
+ private:
+  void FireDOMVRDisplayMountedEventInternal(uint32_t aDisplayID);
+  void FireDOMVRDisplayUnmountedEventInternal(uint32_t aDisplayID);
+  void FireDOMVRDisplayConnectEventInternal(uint32_t aDisplayID);
+  void FireDOMVRDisplayDisconnectEventInternal(uint32_t aDisplayID);
+  void FireDOMVRDisplayPresentChangeEventInternal(uint32_t aDisplayID);
+  void FireDOMVRDisplayConnectEventsForLoadInternal(
+      uint32_t aDisplayID, VRManagerEventObserver* aObserver);
+  void NotifyPresentationGenerationChangedInternal(uint32_t aDisplayID);
+  void NotifyEnumerationCompletedInternal();
+  void NotifyRuntimeCapabilitiesUpdatedInternal();
+
+  nsTArray<RefPtr<VRDisplayClient>> mDisplays;
+  VRDisplayCapabilityFlags mRuntimeCapabilities;
+  bool mDisplaysInitialized;
+  nsTArray<uint64_t> mNavigatorCallbacks;
+
+  struct XRFrameRequest {
+    XRFrameRequest(mozilla::dom::FrameRequestCallback& aCallback,
+                   int32_t aHandle)
+        : mCallback(&aCallback), mHandle(aHandle) {}
+
+    XRFrameRequest(mozilla::dom::XRFrameRequestCallback& aCallback,
+                   mozilla::dom::XRFrame& aFrame, int32_t aHandle)
+        : mXRCallback(&aCallback), mXRFrame(&aFrame), mHandle(aHandle) {}
+    MOZ_CAN_RUN_SCRIPT
+    void Call(const DOMHighResTimeStamp& aTimeStamp);
+
+    // Comparator operators to allow RemoveElementSorted with an
+    // integer argument on arrays of XRFrameRequest
+    bool operator==(int32_t aHandle) const { return mHandle == aHandle; }
+    bool operator<(int32_t aHandle) const { return mHandle < aHandle; }
+
+    RefPtr<mozilla::dom::FrameRequestCallback> mCallback;
+    RefPtr<mozilla::dom::XRFrameRequestCallback> mXRCallback;
+    RefPtr<mozilla::dom::XRFrame> mXRFrame;
+    int32_t mHandle;
+  };
+
+  nsTArray<XRFrameRequest> mFrameRequestCallbacks;
+  /**
+   * The current frame request callback handle
+   */
+  int32_t mFrameRequestCallbackCounter;
+  mozilla::TimeStamp mStartTimeStamp;
+
+  nsTArray<RefPtr<VRManagerEventObserver>> mListeners;
+  bool mWaitingForEnumeration;
+
+  layers::LayersBackend mBackend;
+  nsRefPtrHashtable<nsUint32HashKey, dom::Promise> mGamepadPromiseList;
+  RefPtr<dom::Promise> mRunPuppetPromise;
+  nsTArray<RefPtr<dom::Promise>> mResetPuppetPromises;
+
+  DISALLOW_COPY_AND_ASSIGN(VRManagerChild);
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // MOZILLA_GFX_VR_VRMANAGERCHILD_H
diff --git a/gfx/vr/ipc/VRManagerParent.cpp b/gfx/vr/ipc/VRManagerParent.cpp
new file mode 100644
index 0000000000..393d3fea71
--- /dev/null
+++ b/gfx/vr/ipc/VRManagerParent.cpp
@@ -0,0 +1,299 @@
+/* -*- 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 "VRManagerParent.h"
+
+#include "ipc/VRLayerParent.h"
+#include "mozilla/gfx/PVRManagerParent.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/ipc/ProtocolTypes.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/ipc/ProtocolUtils.h"  // for IToplevelProtocol
+#include "mozilla/TimeStamp.h"          // for TimeStamp
+#include "mozilla/Unused.h"
+#include "VRManager.h"
+#include "VRThread.h"
+
+using mozilla::dom::GamepadHandle;
+
+namespace mozilla {
+using namespace layers;
+namespace gfx {
+
+// See VRManagerChild.cpp
+void ReleaseVRManagerParentSingleton();
+
+VRManagerParent::VRManagerParent(ProcessId aChildProcessId,
+                                 dom::ContentParentId aChildId,
+                                 bool aIsContentChild)
+    : mChildId(aChildId),
+      mHaveEventListener(false),
+      mHaveControllerListener(false),
+      mIsContentChild(aIsContentChild),
+      mVRActiveStatus(false) {
+  MOZ_COUNT_CTOR(VRManagerParent);
+  MOZ_ASSERT(NS_IsMainThread());
+
+  SetOtherProcessId(aChildProcessId);
+}
+
+VRManagerParent::~VRManagerParent() {
+  MOZ_ASSERT(!mVRManagerHolder);
+
+  MOZ_COUNT_DTOR(VRManagerParent);
+}
+
+PVRLayerParent* VRManagerParent::AllocPVRLayerParent(const uint32_t& aDisplayID,
+                                                     const uint32_t& aGroup) {
+  if (!StaticPrefs::dom_vr_enabled() && !StaticPrefs::dom_vr_webxr_enabled()) {
+    return nullptr;
+  }
+
+  RefPtr<VRLayerParent> layer;
+  layer = new VRLayerParent(aDisplayID, aGroup);
+  VRManager* vm = VRManager::Get();
+  vm->AddLayer(layer);
+  return layer.forget().take();
+}
+
+bool VRManagerParent::DeallocPVRLayerParent(PVRLayerParent* actor) {
+  delete actor;
+  return true;
+}
+
+bool VRManagerParent::IsSameProcess() const {
+  return OtherPid() == base::GetCurrentProcId();
+}
+
+void VRManagerParent::RegisterWithManager() {
+  VRManager* vm = VRManager::Get();
+  vm->AddVRManagerParent(this);
+  mVRManagerHolder = vm;
+}
+
+void VRManagerParent::UnregisterFromManager() {
+  VRManager* vm = VRManager::Get();
+  vm->RemoveVRManagerParent(this);
+  mVRManagerHolder = nullptr;
+}
+
+/* static */
+bool VRManagerParent::CreateForContent(Endpoint<PVRManagerParent>&& aEndpoint,
+                                       dom::ContentParentId aChildId) {
+  if (!CompositorThread()) {
+    return false;
+  }
+
+  RefPtr<VRManagerParent> vmp =
+      new VRManagerParent(aEndpoint.OtherPid(), aChildId, true);
+  CompositorThread()->Dispatch(NewRunnableMethod<Endpoint<PVRManagerParent>&&>(
+      "gfx::VRManagerParent::Bind", vmp, &VRManagerParent::Bind,
+      std::move(aEndpoint)));
+
+  return true;
+}
+
+void VRManagerParent::Bind(Endpoint<PVRManagerParent>&& aEndpoint) {
+  if (!aEndpoint.Bind(this)) {
+    return;
+  }
+  mCompositorThreadHolder = CompositorThreadHolder::GetSingleton();
+
+  RegisterWithManager();
+}
+
+/*static*/
+void VRManagerParent::RegisterVRManagerInCompositorThread(
+    VRManagerParent* aVRManager) {
+  aVRManager->RegisterWithManager();
+}
+
+/*static*/
+already_AddRefed<VRManagerParent> VRManagerParent::CreateSameProcess() {
+  RefPtr<VRManagerParent> vmp = new VRManagerParent(
+      base::GetCurrentProcId(), dom::ContentParentId(), false);
+  vmp->mCompositorThreadHolder = CompositorThreadHolder::GetSingleton();
+  CompositorThread()->Dispatch(
+      NewRunnableFunction("RegisterVRManagerIncompositorThreadRunnable",
+                          RegisterVRManagerInCompositorThread, vmp.get()));
+  return vmp.forget();
+}
+
+bool VRManagerParent::CreateForGPUProcess(
+    Endpoint<PVRManagerParent>&& aEndpoint) {
+  RefPtr<VRManagerParent> vmp =
+      new VRManagerParent(aEndpoint.OtherPid(), dom::ContentParentId(), false);
+  vmp->mCompositorThreadHolder = CompositorThreadHolder::GetSingleton();
+  CompositorThread()->Dispatch(NewRunnableMethod<Endpoint<PVRManagerParent>&&>(
+      "gfx::VRManagerParent::Bind", vmp, &VRManagerParent::Bind,
+      std::move(aEndpoint)));
+  return true;
+}
+
+/*static*/
+void VRManagerParent::Shutdown() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(
+      CompositorThread(),
+      "Shutdown() must gets called before the compositor thread is shutdown");
+  ReleaseVRManagerParentSingleton();
+  CompositorThread()->Dispatch(NS_NewRunnableFunction(
+      "VRManagerParent::Shutdown",
+      [vm = RefPtr<VRManager>(VRManager::MaybeGet())]() -> void {
+        if (!vm) {
+          return;
+        }
+        vm->ShutdownVRManagerParents();
+      }));
+}
+
+void VRManagerParent::ActorDestroy(ActorDestroyReason why) {
+  UnregisterFromManager();
+  mCompositorThreadHolder = nullptr;
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvDetectRuntimes() {
+  // Detect runtime capabilities. This will return the presense of VR and/or AR
+  // runtime software, without enumerating or activating any hardware devices.
+  // UpdateDisplayInfo will be sent to VRManagerChild with the results of the
+  // detection.
+  VRManager* vm = VRManager::Get();
+  vm->DetectRuntimes();
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvRefreshDisplays() {
+  // This is called to activate the VR runtimes, detecting the
+  // presence and capabilities of XR hardware.
+  // UpdateDisplayInfo will be sent to VRManagerChild with the results of the
+  // enumerated hardware.
+  VRManager* vm = VRManager::Get();
+  vm->EnumerateDevices();
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvSetGroupMask(
+    const uint32_t& aDisplayID, const uint32_t& aGroupMask) {
+  VRManager* vm = VRManager::Get();
+  vm->SetGroupMask(aGroupMask);
+  return IPC_OK();
+}
+
+bool VRManagerParent::HaveEventListener() { return mHaveEventListener; }
+
+bool VRManagerParent::HaveControllerListener() {
+  return mHaveControllerListener;
+}
+
+bool VRManagerParent::GetVRActiveStatus() { return mVRActiveStatus; }
+
+mozilla::ipc::IPCResult VRManagerParent::RecvSetHaveEventListener(
+    const bool& aHaveEventListener) {
+  mHaveEventListener = aHaveEventListener;
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvControllerListenerAdded() {
+  // Force update the available controllers for GamepadManager,
+  VRManager* vm = VRManager::Get();
+  vm->StopAllHaptics();
+  mHaveControllerListener = true;
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvControllerListenerRemoved() {
+  mHaveControllerListener = false;
+  VRManager* vm = VRManager::Get();
+  vm->StopAllHaptics();
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvRunPuppet(
+    const nsTArray<uint64_t>& aBuffer) {
+#if defined(MOZ_WIDGET_ANDROID)
+  // Not yet implemented for Android / GeckoView
+  // See Bug 1555192
+  Unused << SendNotifyPuppetCommandBufferCompleted(false);
+#else
+  VRManager* vm = VRManager::Get();
+  if (!vm->RunPuppet(aBuffer, this)) {
+    // We have immediately failed, need to resolve the
+    // promise right away
+    Unused << SendNotifyPuppetCommandBufferCompleted(false);
+  }
+#endif  // defined(MOZ_WIDGET_ANDROID)
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvResetPuppet() {
+#if defined(MOZ_WIDGET_ANDROID)
+  // Not yet implemented for Android / GeckoView
+  // See Bug 1555192
+#else
+  VRManager* vm = VRManager::Get();
+  vm->ResetPuppet(this);
+#endif  // defined(MOZ_WIDGET_ANDROID)
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvVibrateHaptic(
+    const mozilla::dom::GamepadHandle& aGamepadHandle,
+    const uint32_t& aHapticIndex, const double& aIntensity,
+    const double& aDuration, const uint32_t& aPromiseID) {
+  VRManager* vm = VRManager::Get();
+  VRManagerPromise promise(this, aPromiseID);
+
+  vm->VibrateHaptic(aGamepadHandle, aHapticIndex, aIntensity, aDuration,
+                    promise);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvStopVibrateHaptic(
+    const mozilla::dom::GamepadHandle& aGamepadHandle) {
+  VRManager* vm = VRManager::Get();
+  vm->StopVibrateHaptic(aGamepadHandle);
+  return IPC_OK();
+}
+
+bool VRManagerParent::SendReplyGamepadVibrateHaptic(
+    const uint32_t& aPromiseID) {
+  // GamepadManager only exists at the content process
+  // or the same process in non-e10s mode.
+  if (mHaveControllerListener && (mIsContentChild || IsSameProcess())) {
+    return PVRManagerParent::SendReplyGamepadVibrateHaptic(aPromiseID);
+  }
+
+  return true;
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvStartVRNavigation(
+    const uint32_t& aDeviceID) {
+  VRManager* vm = VRManager::Get();
+  vm->StartVRNavigation(aDeviceID);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvStopVRNavigation(
+    const uint32_t& aDeviceID, const TimeDuration& aTimeout) {
+  VRManager* vm = VRManager::Get();
+  vm->StopVRNavigation(aDeviceID, aTimeout);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvStartActivity() {
+  mVRActiveStatus = true;
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRManagerParent::RecvStopActivity() {
+  mVRActiveStatus = false;
+  return IPC_OK();
+}
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRManagerParent.h b/gfx/vr/ipc/VRManagerParent.h
new file mode 100644
index 0000000000..db55356324
--- /dev/null
+++ b/gfx/vr/ipc/VRManagerParent.h
@@ -0,0 +1,121 @@
+/* -*- 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 MOZILLA_GFX_VR_VRMANAGERPARENT_H
+#define MOZILLA_GFX_VR_VRMANAGERPARENT_H
+
+#include "mozilla/dom/ipc/IdType.h"
+#include "mozilla/layers/CompositorThread.h"  // for CompositorThreadHolder
+#include "mozilla/layers/CompositableTransactionParent.h"  // need?
+#include "mozilla/gfx/PVRManagerParent.h"  // for PVRManagerParent
+#include "mozilla/gfx/PVRLayerParent.h"    // for PVRLayerParent
+#include "mozilla/ipc/ProtocolUtils.h"     // for IToplevelProtocol
+#include "mozilla/TimeStamp.h"             // for TimeStamp
+#include "gfxVR.h"                         // for VRFieldOfView
+
+namespace mozilla {
+using namespace layers;
+namespace gfx {
+
+class VRManager;
+
+class VRManagerParent final : public PVRManagerParent {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRManagerParent, final);
+
+  friend class PVRManagerParent;
+
+ public:
+  explicit VRManagerParent(ProcessId aChildProcessId,
+                           dom::ContentParentId aChildId, bool aIsContentChild);
+
+  static already_AddRefed<VRManagerParent> CreateSameProcess();
+  static bool CreateForGPUProcess(Endpoint<PVRManagerParent>&& aEndpoint);
+  static bool CreateForContent(Endpoint<PVRManagerParent>&& aEndpoint,
+                               dom::ContentParentId aChildId);
+  static void Shutdown();
+
+  bool IsSameProcess() const;
+  bool HaveEventListener();
+  bool HaveControllerListener();
+  bool GetVRActiveStatus();
+  bool SendReplyGamepadVibrateHaptic(const uint32_t& aPromiseID);
+
+ protected:
+  ~VRManagerParent();
+
+  PVRLayerParent* AllocPVRLayerParent(const uint32_t& aDisplayID,
+                                      const uint32_t& aGroup);
+  bool DeallocPVRLayerParent(PVRLayerParent* actor);
+
+  virtual void ActorDestroy(ActorDestroyReason why) override;
+
+  mozilla::ipc::IPCResult RecvDetectRuntimes();
+  mozilla::ipc::IPCResult RecvRefreshDisplays();
+  mozilla::ipc::IPCResult RecvSetGroupMask(const uint32_t& aDisplayID,
+                                           const uint32_t& aGroupMask);
+  mozilla::ipc::IPCResult RecvSetHaveEventListener(
+      const bool& aHaveEventListener);
+  mozilla::ipc::IPCResult RecvControllerListenerAdded();
+  mozilla::ipc::IPCResult RecvControllerListenerRemoved();
+  mozilla::ipc::IPCResult RecvVibrateHaptic(
+      const mozilla::dom::GamepadHandle& aGamepadHandle,
+      const uint32_t& aHapticIndex, const double& aIntensity,
+      const double& aDuration, const uint32_t& aPromiseID);
+  mozilla::ipc::IPCResult RecvStopVibrateHaptic(
+      const mozilla::dom::GamepadHandle& aGamepadHandle);
+  mozilla::ipc::IPCResult RecvStartVRNavigation(const uint32_t& aDeviceID);
+  mozilla::ipc::IPCResult RecvStopVRNavigation(const uint32_t& aDeviceID,
+                                               const TimeDuration& aTimeout);
+  mozilla::ipc::IPCResult RecvStartActivity();
+  mozilla::ipc::IPCResult RecvStopActivity();
+
+  mozilla::ipc::IPCResult RecvRunPuppet(const nsTArray<uint64_t>& aBuffer);
+  mozilla::ipc::IPCResult RecvResetPuppet();
+
+ private:
+  void RegisterWithManager();
+  void UnregisterFromManager();
+
+  void Bind(Endpoint<PVRManagerParent>&& aEndpoint);
+
+  static void RegisterVRManagerInCompositorThread(VRManagerParent* aVRManager);
+
+  // Keep the compositor thread alive, until we have destroyed ourselves.
+  RefPtr<CompositorThreadHolder> mCompositorThreadHolder;
+
+  // Keep the VRManager alive, until we have destroyed ourselves.
+  RefPtr<VRManager> mVRManagerHolder;
+  dom::ContentParentId mChildId;
+  bool mHaveEventListener;
+  bool mHaveControllerListener;
+  bool mIsContentChild;
+
+  // When VR tabs are switched the background, we won't need to
+  // initialize its session in VRService thread.
+  bool mVRActiveStatus;
+};
+
+class VRManagerPromise final {
+  friend class VRManager;
+
+ public:
+  explicit VRManagerPromise(RefPtr<VRManagerParent> aParent,
+                            uint32_t aPromiseID)
+      : mParent(aParent), mPromiseID(aPromiseID) {}
+  ~VRManagerPromise() { mParent = nullptr; }
+  bool operator==(const VRManagerPromise& aOther) const {
+    return mParent == aOther.mParent && mPromiseID == aOther.mPromiseID;
+  }
+
+ private:
+  RefPtr<VRManagerParent> mParent;
+  uint32_t mPromiseID;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // MOZILLA_GFX_VR_VRMANAGERPARENT_H
diff --git a/gfx/vr/ipc/VRMessageUtils.h b/gfx/vr/ipc/VRMessageUtils.h
new file mode 100644
index 0000000000..0d19c9e4ec
--- /dev/null
+++ b/gfx/vr/ipc/VRMessageUtils.h
@@ -0,0 +1,73 @@
+/* -*- 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 mozilla_gfx_vr_VRMessageUtils_h
+#define mozilla_gfx_vr_VRMessageUtils_h
+
+#include "ipc/EnumSerializer.h"
+#include "ipc/IPCMessageUtils.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/GfxMessageUtils.h"
+#include "mozilla/dom/GamepadMessageUtils.h"
+
+#include "gfxVR.h"
+
+namespace IPC {
+
+template <>
+struct ParamTraits<mozilla::gfx::VRControllerType>
+    : public ContiguousEnumSerializer<mozilla::gfx::VRControllerType,
+                                      mozilla::gfx::VRControllerType::_empty,
+                                      mozilla::gfx::VRControllerType::_end> {};
+
+// VRHMDSensorState is POD, we can use PlainOldDataSerializer
+static_assert(std::is_pod<mozilla::gfx::VRHMDSensorState>::value,
+              "mozilla::gfx::VRHMDSensorState must be a POD type.");
+template <>
+struct ParamTraits<mozilla::gfx::VRHMDSensorState>
+    : public PlainOldDataSerializer<mozilla::gfx::VRHMDSensorState> {};
+
+// VRDisplayInfo is POD, we can use PlainOldDataSerializer
+static_assert(std::is_pod<mozilla::gfx::VRDisplayInfo>::value,
+              "mozilla::gfx::VRDisplayInfo must be a POD type.");
+template <>
+struct ParamTraits<mozilla::gfx::VRDisplayInfo>
+    : public PlainOldDataSerializer<mozilla::gfx::VRDisplayInfo> {};
+
+template <>
+struct ParamTraits<mozilla::gfx::VRSubmitFrameResultInfo> {
+  typedef mozilla::gfx::VRSubmitFrameResultInfo paramType;
+
+  static void Write(MessageWriter* aWriter, const paramType& aParam) {
+    WriteParam(aWriter, aParam.mBase64Image);
+    WriteParam(aWriter, aParam.mFormat);
+    WriteParam(aWriter, aParam.mWidth);
+    WriteParam(aWriter, aParam.mHeight);
+    WriteParam(aWriter, aParam.mFrameNum);
+  }
+
+  static bool Read(MessageReader* aReader, paramType* aResult) {
+    if (!ReadParam(aReader, &(aResult->mBase64Image)) ||
+        !ReadParam(aReader, &(aResult->mFormat)) ||
+        !ReadParam(aReader, &(aResult->mWidth)) ||
+        !ReadParam(aReader, &(aResult->mHeight)) ||
+        !ReadParam(aReader, &(aResult->mFrameNum))) {
+      return false;
+    }
+
+    return true;
+  }
+};
+
+template <>
+struct ParamTraits<mozilla::gfx::VRDisplayCapabilityFlags>
+    : public BitFlagsEnumSerializer<
+          mozilla::gfx::VRDisplayCapabilityFlags,
+          mozilla::gfx::VRDisplayCapabilityFlags::Cap_All> {};
+
+}  // namespace IPC
+
+#endif  // mozilla_gfx_vr_VRMessageUtils_h
diff --git a/gfx/vr/ipc/VRParent.cpp b/gfx/vr/ipc/VRParent.cpp
new file mode 100644
index 0000000000..234352ba08
--- /dev/null
+++ b/gfx/vr/ipc/VRParent.cpp
@@ -0,0 +1,191 @@
+/* -*- 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 "VRParent.h"
+#include "VRGPUParent.h"
+#include "gfxConfig.h"
+#include "nsDebugImpl.h"
+#include "nsThreadManager.h"
+#include "nsPrintfCString.h"
+
+#include "mozilla/dom/MemoryReportRequest.h"
+#include "mozilla/gfx/gfxVars.h"
+#include "mozilla/ipc/CrashReporterClient.h"
+#include "mozilla/ipc/ProcessChild.h"
+#include "mozilla/ipc/ProcessUtils.h"
+#include "mozilla/Preferences.h"
+
+#if defined(XP_WIN)
+#  include <process.h>
+#  include "mozilla/gfx/DeviceManagerDx.h"
+#else
+#  include <unistd.h>
+#endif
+
+namespace mozilla {
+namespace gfx {
+
+using mozilla::ipc::IPCResult;
+
+VRParent::VRParent() : mVRGPUParent(nullptr) {}
+
+IPCResult VRParent::RecvNewGPUVRManager(Endpoint<PVRGPUParent>&& aEndpoint) {
+  RefPtr<VRGPUParent> vrGPUParent =
+      VRGPUParent::CreateForGPU(std::move(aEndpoint));
+  if (!vrGPUParent) {
+    return IPC_FAIL_NO_REASON(this);
+  }
+
+  mVRGPUParent = std::move(vrGPUParent);
+  return IPC_OK();
+}
+
+IPCResult VRParent::RecvInit(nsTArray<GfxVarUpdate>&& vars,
+                             const DevicePrefs& devicePrefs) {
+  Unused << SendInitComplete();
+
+  for (const auto& var : vars) {
+    gfxVars::ApplyUpdate(var);
+  }
+
+  // Inherit device preferences.
+  gfxConfig::Inherit(Feature::HW_COMPOSITING, devicePrefs.hwCompositing());
+  gfxConfig::Inherit(Feature::D3D11_COMPOSITING,
+                     devicePrefs.d3d11Compositing());
+  gfxConfig::Inherit(Feature::OPENGL_COMPOSITING, devicePrefs.oglCompositing());
+  gfxConfig::Inherit(Feature::DIRECT2D, devicePrefs.useD2D1());
+
+#if defined(XP_WIN)
+  if (gfxConfig::IsEnabled(Feature::D3D11_COMPOSITING)) {
+    DeviceManagerDx::Get()->CreateCompositorDevices();
+  }
+#endif
+  return IPC_OK();
+}
+
+IPCResult VRParent::RecvUpdateVar(const GfxVarUpdate& aUpdate) {
+  gfxVars::ApplyUpdate(aUpdate);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRParent::RecvPreferenceUpdate(const Pref& aPref) {
+  Preferences::SetPreference(aPref);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRParent::RecvOpenVRControllerActionPathToVR(
+    const nsCString& aPath) {
+  mOpenVRControllerAction = aPath;
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRParent::RecvOpenVRControllerManifestPathToVR(
+    const VRControllerType& aType, const nsCString& aPath) {
+  mOpenVRControllerManifest.InsertOrUpdate(static_cast<uint32_t>(aType), aPath);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult VRParent::RecvRequestMemoryReport(
+    const uint32_t& aGeneration, const bool& aAnonymize,
+    const bool& aMinimizeMemoryUsage, const Maybe<FileDescriptor>& aDMDFile,
+    const RequestMemoryReportResolver& aResolver) {
+  MOZ_ASSERT(XRE_IsVRProcess());
+  nsPrintfCString processName("VR (pid %u)", (unsigned)getpid());
+
+  mozilla::dom::MemoryReportRequestClient::Start(
+      aGeneration, aAnonymize, aMinimizeMemoryUsage, aDMDFile, processName,
+      [&](const MemoryReport& aReport) {
+        Unused << SendAddMemoryReport(aReport);
+      },
+      aResolver);
+  return IPC_OK();
+}
+
+void VRParent::ActorDestroy(ActorDestroyReason aWhy) {
+  if (AbnormalShutdown == aWhy) {
+    NS_WARNING("Shutting down VR process early due to a crash!");
+    ipc::ProcessChild::QuickExit();
+  }
+  if (mVRGPUParent && !mVRGPUParent->IsClosed()) {
+    mVRGPUParent->Close();
+  }
+  mVRGPUParent = nullptr;
+
+#ifndef NS_FREE_PERMANENT_DATA
+  // No point in going through XPCOM shutdown because we don't keep persistent
+  // state.
+  ipc::ProcessChild::QuickExit();
+#endif
+
+#if defined(XP_WIN)
+  DeviceManagerDx::Shutdown();
+#endif
+  gfxVars::Shutdown();
+  gfxConfig::Shutdown();
+  ipc::CrashReporterClient::DestroySingleton();
+  // Only calling XRE_ShutdownChildProcess() at the child process
+  // instead of the main process. Otherwise, it will close all child processes
+  // that are spawned from the main process.
+  XRE_ShutdownChildProcess();
+}
+
+bool VRParent::Init(mozilla::ipc::UntypedEndpoint&& aEndpoint,
+                    const char* aParentBuildID) {
+  // Initialize the thread manager before starting IPC. Otherwise, messages
+  // may be posted to the main thread and we won't be able to process them.
+  if (NS_WARN_IF(NS_FAILED(nsThreadManager::get().Init()))) {
+    return false;
+  }
+
+  // Now it's safe to start IPC.
+  if (NS_WARN_IF(!aEndpoint.Bind(this))) {
+    return false;
+  }
+
+  nsDebugImpl::SetMultiprocessMode("VR");
+
+  // This must be checked before any IPDL message, which may hit sentinel
+  // errors due to parent and content processes having different
+  // versions.
+  MessageChannel* channel = GetIPCChannel();
+  if (channel && !channel->SendBuildIDsMatchMessage(aParentBuildID)) {
+    // We need to quit this process if the buildID doesn't match the parent's.
+    // This can occur when an update occurred in the background.
+    ipc::ProcessChild::QuickExit();
+  }
+
+  // Init crash reporter support.
+  ipc::CrashReporterClient::InitSingleton(this);
+
+  gfxConfig::Init();
+  gfxVars::Initialize();
+#if defined(XP_WIN)
+  DeviceManagerDx::Init();
+#endif
+  if (NS_FAILED(NS_InitMinimalXPCOM())) {
+    return false;
+  }
+
+  mozilla::ipc::SetThisProcessName("VR Process");
+  return true;
+}
+
+bool VRParent::GetOpenVRControllerActionPath(nsCString* aPath) {
+  if (!mOpenVRControllerAction.IsEmpty()) {
+    *aPath = mOpenVRControllerAction;
+    return true;
+  }
+
+  return false;
+}
+
+bool VRParent::GetOpenVRControllerManifestPath(VRControllerType aType,
+                                               nsCString* aPath) {
+  return mOpenVRControllerManifest.Get(static_cast<uint32_t>(aType), aPath);
+}
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRParent.h b/gfx/vr/ipc/VRParent.h
new file mode 100644
index 0000000000..0943232d7e
--- /dev/null
+++ b/gfx/vr/ipc/VRParent.h
@@ -0,0 +1,64 @@
+/* -*- 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 GFX_VR_PARENT_H
+#define GFX_VR_PARENT_H
+
+#include "mozilla/gfx/PVRParent.h"
+#include "VRGPUParent.h"
+
+namespace mozilla {
+namespace gfx {
+
+class VRService;
+class VRSystemManagerExternal;
+
+class VRParent final : public PVRParent {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRParent, final);
+
+  friend class PVRParent;
+
+ public:
+  explicit VRParent();
+
+  bool Init(mozilla::ipc::UntypedEndpoint&& aEndpoint,
+            const char* aParentBuildID);
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+  bool GetOpenVRControllerActionPath(nsCString* aPath);
+  bool GetOpenVRControllerManifestPath(VRControllerType aType,
+                                       nsCString* aPath);
+
+ protected:
+  ~VRParent() = default;
+
+  mozilla::ipc::IPCResult RecvNewGPUVRManager(
+      Endpoint<PVRGPUParent>&& aEndpoint);
+  mozilla::ipc::IPCResult RecvInit(nsTArray<GfxVarUpdate>&& vars,
+                                   const DevicePrefs& devicePrefs);
+  mozilla::ipc::IPCResult RecvNotifyVsync(const TimeStamp& vsyncTimestamp);
+  mozilla::ipc::IPCResult RecvUpdateVar(const GfxVarUpdate& pref);
+  mozilla::ipc::IPCResult RecvPreferenceUpdate(const Pref& pref);
+  mozilla::ipc::IPCResult RecvOpenVRControllerActionPathToVR(
+      const nsCString& aPath);
+  mozilla::ipc::IPCResult RecvOpenVRControllerManifestPathToVR(
+      const VRControllerType& aType, const nsCString& aPath);
+  mozilla::ipc::IPCResult RecvRequestMemoryReport(
+      const uint32_t& generation, const bool& anonymize,
+      const bool& minimizeMemoryUsage,
+      const Maybe<ipc::FileDescriptor>& DMDFile,
+      const RequestMemoryReportResolver& aResolver);
+
+ private:
+  nsCString mOpenVRControllerAction;
+  nsTHashMap<nsUint32HashKey, nsCString> mOpenVRControllerManifest;
+  RefPtr<VRGPUParent> mVRGPUParent;
+  DISALLOW_COPY_AND_ASSIGN(VRParent);
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // GFX_VR_PARENT_H
diff --git a/gfx/vr/ipc/VRProcessChild.cpp b/gfx/vr/ipc/VRProcessChild.cpp
new file mode 100644
index 0000000000..be7dc89bd3
--- /dev/null
+++ b/gfx/vr/ipc/VRProcessChild.cpp
@@ -0,0 +1,49 @@
+/* -*- 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 "VRProcessChild.h"
+
+#include "mozilla/BackgroundHangMonitor.h"
+#include "mozilla/GeckoArgs.h"
+#include "mozilla/ipc/IOThreadChild.h"
+#include "mozilla/ipc/ProcessUtils.h"
+#include "mozilla/StaticPrefs_dom.h"
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+using mozilla::ipc::IOThreadChild;
+
+StaticRefPtr<VRParent> sVRParent;
+
+VRProcessChild::~VRProcessChild() { sVRParent = nullptr; }
+
+/*static*/
+VRParent* VRProcessChild::GetVRParent() {
+  MOZ_ASSERT(sVRParent);
+  return sVRParent;
+}
+
+bool VRProcessChild::Init(int aArgc, char* aArgv[]) {
+  Maybe<const char*> parentBuildID =
+      geckoargs::sParentBuildID.Get(aArgc, aArgv);
+  if (parentBuildID.isNothing()) {
+    return false;
+  }
+
+  if (!ProcessChild::InitPrefs(aArgc, aArgv)) {
+    return false;
+  }
+
+  sVRParent = new VRParent();
+  sVRParent->Init(TakeInitialEndpoint(), *parentBuildID);
+
+  return true;
+}
+
+void VRProcessChild::CleanUp() {
+  sVRParent = nullptr;
+  NS_ShutdownXPCOM(nullptr);
+}
diff --git a/gfx/vr/ipc/VRProcessChild.h b/gfx/vr/ipc/VRProcessChild.h
new file mode 100644
index 0000000000..e3f275c9af
--- /dev/null
+++ b/gfx/vr/ipc/VRProcessChild.h
@@ -0,0 +1,39 @@
+/* -*- 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 GFX_VR_PROCESS_CHILD_H
+#define GFX_VR_PROCESS_CHILD_H
+
+#include "mozilla/ipc/ProcessChild.h"
+#include "VRParent.h"
+
+namespace mozilla {
+namespace gfx {
+
+/**
+ * Contains the VRChild object that facilitates IPC communication to/from
+ * the instance of the VR library that is run in this process.
+ */
+class VRProcessChild final : public mozilla::ipc::ProcessChild {
+ protected:
+  typedef mozilla::ipc::ProcessChild ProcessChild;
+
+ public:
+  using ProcessChild::ProcessChild;
+  ~VRProcessChild();
+
+  // IPC channel for VR process talk to the parent process.
+  static VRParent* GetVRParent();
+
+  // ProcessChild functions.
+  virtual bool Init(int aArgc, char* aArgv[]) override;
+  virtual void CleanUp() override;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif /* GFX_VR_PROCESS_CHILD_H */
diff --git a/gfx/vr/ipc/VRProcessManager.cpp b/gfx/vr/ipc/VRProcessManager.cpp
new file mode 100644
index 0000000000..f3bc13bac0
--- /dev/null
+++ b/gfx/vr/ipc/VRProcessManager.cpp
@@ -0,0 +1,287 @@
+/* -*- 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 "VRProcessManager.h"
+
+#include "VRProcessParent.h"
+#include "VRChild.h"
+#include "VRGPUChild.h"
+#include "VRGPUParent.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/gfx/Logging.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/MemoryReportingProcess.h"
+#include "mozilla/Preferences.h"
+
+namespace mozilla {
+namespace gfx {
+
+static StaticAutoPtr<VRProcessManager> sSingleton;
+
+/* static */
+VRProcessManager* VRProcessManager::Get() { return sSingleton; }
+
+/* static */
+void VRProcessManager::Initialize() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  if (sSingleton == nullptr) {
+    sSingleton = new VRProcessManager();
+  }
+}
+
+/* static */
+void VRProcessManager::Shutdown() { sSingleton = nullptr; }
+
+VRProcessManager::VRProcessManager() : mProcess(nullptr), mVRChild(nullptr) {
+  MOZ_COUNT_CTOR(VRProcessManager);
+
+  mObserver = new Observer(this);
+  nsContentUtils::RegisterShutdownObserver(mObserver);
+  Preferences::AddStrongObserver(mObserver, "");
+}
+
+VRProcessManager::~VRProcessManager() {
+  MOZ_COUNT_DTOR(VRProcessManager);
+
+  if (mObserver) {
+    nsContentUtils::UnregisterShutdownObserver(mObserver);
+    Preferences::RemoveObserver(mObserver, "");
+    mObserver = nullptr;
+  }
+
+  DestroyProcess();
+  // The VR process should have already been shut down.
+  MOZ_ASSERT(!mProcess);
+}
+
+void VRProcessManager::LaunchVRProcess() {
+  if (mProcess) {
+    return;
+  }
+
+  // The subprocess is launched asynchronously, so we wait for a callback to
+  // acquire the IPDL actor.
+  mProcess = new VRProcessParent(this);
+  if (!mProcess->Launch()) {
+    DisableVRProcess("Failed to launch VR process");
+  }
+}
+
+void VRProcessManager::DisableVRProcess(const char* aMessage) {
+  if (!StaticPrefs::dom_vr_process_enabled_AtStartup()) {
+    return;
+  }
+
+  DestroyProcess();
+}
+
+void VRProcessManager::DestroyProcess() {
+  if (!mProcess) {
+    return;
+  }
+
+  mProcess->Shutdown();
+  mProcess = nullptr;
+  mVRChild = nullptr;
+
+  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::VRProcessStatus,
+                                     "Destroyed"_ns);
+}
+
+bool VRProcessManager::EnsureVRReady() {
+  if (mProcess && !mProcess->IsConnected()) {
+    if (!mProcess->WaitForLaunch()) {
+      // If this fails, we should have fired OnProcessLaunchComplete and
+      // removed the process.
+      MOZ_ASSERT(!mProcess && !mVRChild);
+      return false;
+    }
+  }
+
+  if (mVRChild) {
+    if (mVRChild->EnsureVRReady()) {
+      return true;
+    }
+
+    // If the initialization above fails, we likely have a GPU process teardown
+    // waiting in our message queue (or will soon). We need to ensure we don't
+    // restart it later because if we fail here, our callers assume they should
+    // fall back to a combined UI/GPU process. This also ensures our internal
+    // state is consistent (e.g. process token is reset).
+    DisableVRProcess("Failed to initialize VR process");
+  }
+
+  return false;
+}
+
+void VRProcessManager::OnProcessLaunchComplete(VRProcessParent* aParent) {
+  MOZ_ASSERT(mProcess && mProcess == aParent);
+
+  mVRChild = mProcess->GetActor();
+
+  if (!mProcess->IsConnected()) {
+    DestroyProcess();
+    return;
+  }
+
+  // Flush any pref updates that happened during launch and weren't
+  // included in the blobs set up in LaunchGPUProcess.
+  for (const mozilla::dom::Pref& pref : mQueuedPrefs) {
+    Unused << NS_WARN_IF(!mVRChild->SendPreferenceUpdate(pref));
+  }
+  mQueuedPrefs.Clear();
+
+  CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::VRProcessStatus,
+                                     "Running"_ns);
+}
+
+void VRProcessManager::OnProcessUnexpectedShutdown(VRProcessParent* aParent) {
+  MOZ_ASSERT(mProcess && mProcess == aParent);
+
+  DestroyProcess();
+}
+
+bool VRProcessManager::CreateGPUBridges(
+    base::ProcessId aOtherProcess,
+    mozilla::ipc::Endpoint<PVRGPUChild>* aOutVRBridge) {
+  if (!CreateGPUVRManager(aOtherProcess, aOutVRBridge)) {
+    return false;
+  }
+  return true;
+}
+
+bool VRProcessManager::CreateGPUVRManager(
+    base::ProcessId aOtherProcess,
+    mozilla::ipc::Endpoint<PVRGPUChild>* aOutEndpoint) {
+  if (mProcess && !mProcess->IsConnected()) {
+    NS_WARNING("VR process haven't connected with the parent process yet");
+    return false;
+  }
+
+  base::ProcessId vrparentPid = mProcess
+                                    ? mProcess->OtherPid()  // VR process id.
+                                    : base::GetCurrentProcId();
+
+  ipc::Endpoint<PVRGPUParent> vrparentPipe;
+  ipc::Endpoint<PVRGPUChild> vrchildPipe;
+  nsresult rv = PVRGPU::CreateEndpoints(vrparentPid,    // vr process id
+                                        aOtherProcess,  // gpu process id
+                                        &vrparentPipe, &vrchildPipe);
+
+  if (NS_FAILED(rv)) {
+    gfxCriticalNote << "Could not create gpu-vr bridge: " << hexa(int(rv));
+    return false;
+  }
+
+  // Bind vr-gpu pipe to VRParent and make a PVRGPU connection.
+  VRChild* vrChild = mProcess->GetActor();
+  vrChild->SendNewGPUVRManager(std::move(vrparentPipe));
+
+  *aOutEndpoint = std::move(vrchildPipe);
+  return true;
+}
+
+NS_IMPL_ISUPPORTS(VRProcessManager::Observer, nsIObserver);
+
+VRProcessManager::Observer::Observer(VRProcessManager* aManager)
+    : mManager(aManager) {}
+
+NS_IMETHODIMP
+VRProcessManager::Observer::Observe(nsISupports* aSubject, const char* aTopic,
+                                    const char16_t* aData) {
+  if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
+    mManager->OnXPCOMShutdown();
+  } else if (!strcmp(aTopic, "nsPref:changed")) {
+    mManager->OnPreferenceChange(aData);
+  }
+  return NS_OK;
+}
+
+void VRProcessManager::CleanShutdown() { DestroyProcess(); }
+
+void VRProcessManager::OnXPCOMShutdown() {
+  if (mObserver) {
+    nsContentUtils::UnregisterShutdownObserver(mObserver);
+    Preferences::RemoveObserver(mObserver, "");
+    mObserver = nullptr;
+  }
+
+  CleanShutdown();
+}
+
+void VRProcessManager::OnPreferenceChange(const char16_t* aData) {
+  // We know prefs are ASCII here.
+  NS_LossyConvertUTF16toASCII strData(aData);
+
+  mozilla::dom::Pref pref(strData, /* isLocked */ false,
+                          /* isSanitized */ false, Nothing(), Nothing());
+
+  Preferences::GetPreference(&pref, GeckoProcessType_VR,
+                             /* remoteType */ ""_ns);
+  if (!!mVRChild) {
+    MOZ_ASSERT(mQueuedPrefs.IsEmpty());
+    mVRChild->SendPreferenceUpdate(pref);
+  } else {
+    mQueuedPrefs.AppendElement(pref);
+  }
+}
+
+VRChild* VRProcessManager::GetVRChild() { return mProcess->GetActor(); }
+
+class VRMemoryReporter : public MemoryReportingProcess {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRMemoryReporter, override)
+
+  bool IsAlive() const override {
+    if (VRProcessManager* vpm = VRProcessManager::Get()) {
+      return !!vpm->GetVRChild();
+    }
+    return false;
+  }
+
+  bool SendRequestMemoryReport(
+      const uint32_t& aGeneration, const bool& aAnonymize,
+      const bool& aMinimizeMemoryUsage,
+      const Maybe<ipc::FileDescriptor>& aDMDFile) override {
+    VRChild* child = GetChild();
+    if (!child) {
+      return false;
+    }
+
+    return child->SendRequestMemoryReport(aGeneration, aAnonymize,
+                                          aMinimizeMemoryUsage, aDMDFile);
+  }
+
+  int32_t Pid() const override {
+    if (VRChild* child = GetChild()) {
+      return (int32_t)child->OtherPid();
+    }
+    return 0;
+  }
+
+ private:
+  VRChild* GetChild() const {
+    if (VRProcessManager* vpm = VRProcessManager::Get()) {
+      if (VRChild* child = vpm->GetVRChild()) {
+        return child;
+      }
+    }
+    return nullptr;
+  }
+
+ protected:
+  ~VRMemoryReporter() = default;
+};
+
+RefPtr<MemoryReportingProcess> VRProcessManager::GetProcessMemoryReporter() {
+  if (!EnsureVRReady()) {
+    return nullptr;
+  }
+  return new VRMemoryReporter();
+}
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRProcessManager.h b/gfx/vr/ipc/VRProcessManager.h
new file mode 100644
index 0000000000..030045d300
--- /dev/null
+++ b/gfx/vr/ipc/VRProcessManager.h
@@ -0,0 +1,95 @@
+/* -*- 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 GFX_VR_PROCESS_MANAGER_H
+#define GFX_VR_PROCESS_MANAGER_H
+
+#include "VRProcessParent.h"
+
+#include "mozilla/ipc/ProtocolUtils.h"
+#include "nsIObserver.h"
+
+namespace mozilla {
+class MemoryReportingProcess;
+namespace ipc {
+template <typename T>
+class Endpoint;
+}
+namespace gfx {
+
+class VRManagerChild;
+class PVRGPUChild;
+class VRChild;
+
+// The VRProcessManager is a singleton responsible for creating VR-bound
+// objects that may live in another process.
+class VRProcessManager final : public VRProcessParent::Listener {
+ public:
+  static VRProcessManager* Get();
+  static void Initialize();
+  static void Shutdown();
+
+  ~VRProcessManager();
+
+  // If not using a VR process, launch a new VR process asynchronously.
+  void LaunchVRProcess();
+
+  // Ensure that VR-bound methods can be used. If no VR process is being
+  // used, or one is launched and ready, this function returns immediately.
+  // Otherwise it blocks until the VR process has finished launching.
+  bool EnsureVRReady();
+
+  bool CreateGPUBridges(base::ProcessId aOtherProcess,
+                        mozilla::ipc::Endpoint<PVRGPUChild>* aOutVRBridge);
+
+  VRChild* GetVRChild();
+  // If a VR process is present, create a MemoryReportingProcess object.
+  // Otherwise, return null.
+  RefPtr<MemoryReportingProcess> GetProcessMemoryReporter();
+
+  virtual void OnProcessLaunchComplete(VRProcessParent* aParent) override;
+  virtual void OnProcessUnexpectedShutdown(VRProcessParent* aParent) override;
+
+ private:
+  VRProcessManager();
+
+  DISALLOW_COPY_AND_ASSIGN(VRProcessManager);
+
+  bool CreateGPUVRManager(base::ProcessId aOtherProcess,
+                          mozilla::ipc::Endpoint<PVRGPUChild>* aOutEndpoint);
+  void OnXPCOMShutdown();
+  void OnPreferenceChange(const char16_t* aData);
+  void CleanShutdown();
+  void DestroyProcess();
+
+  // Permanently disable the VR process and record a message why.
+  void DisableVRProcess(const char* aMessage);
+
+  class Observer final : public nsIObserver {
+   public:
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIOBSERVER
+    explicit Observer(VRProcessManager* aManager);
+
+   protected:
+    ~Observer() = default;
+
+    VRProcessManager* mManager;
+  };
+  friend class Observer;
+
+  RefPtr<Observer> mObserver;
+  VRProcessParent* mProcess;
+  VRChild* mVRChild;
+  // Collects any pref changes that occur during process launch (after
+  // the initial map is passed in command-line arguments) to be sent
+  // when the process can receive IPC messages.
+  nsTArray<mozilla::dom::Pref> mQueuedPrefs;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // GFX_VR_PROCESS_MANAGER_H
diff --git a/gfx/vr/ipc/VRProcessParent.cpp b/gfx/vr/ipc/VRProcessParent.cpp
new file mode 100644
index 0000000000..56893c9e29
--- /dev/null
+++ b/gfx/vr/ipc/VRProcessParent.cpp
@@ -0,0 +1,246 @@
+/* -*- 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 "VRProcessParent.h"
+#include "VRGPUChild.h"
+#include "VRProcessManager.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/MemoryReportRequest.h"
+#include "mozilla/gfx/GPUProcessManager.h"
+#include "mozilla/gfx/GPUChild.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/ipc/ProcessChild.h"
+#include "mozilla/ipc/ProcessUtils.h"
+#include "mozilla/ipc/ProtocolTypes.h"
+#include "mozilla/ipc/ProtocolUtils.h"  // for IToplevelProtocol
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/TimeStamp.h"  // for TimeStamp
+#include "mozilla/Unused.h"
+#include "VRChild.h"
+#include "VRThread.h"
+
+#include "nsAppRunner.h"  // for IToplevelProtocol
+
+using std::string;
+using std::vector;
+
+using namespace mozilla::ipc;
+
+namespace mozilla {
+namespace gfx {
+
+VRProcessParent::VRProcessParent(Listener* aListener)
+    : GeckoChildProcessHost(GeckoProcessType_VR),
+      mTaskFactory(this),
+      mListener(aListener),
+      mLaunchPhase(LaunchPhase::Unlaunched),
+      mChannelClosed(false),
+      mShutdownRequested(false) {}
+
+VRProcessParent::~VRProcessParent() = default;
+
+bool VRProcessParent::Launch() {
+  MOZ_ASSERT(mLaunchPhase == LaunchPhase::Unlaunched);
+  MOZ_ASSERT(!mVRChild);
+  mLaunchThread = NS_GetCurrentThread();
+
+  mLaunchPhase = LaunchPhase::Waiting;
+
+  std::vector<std::string> extraArgs;
+  ProcessChild::AddPlatformBuildID(extraArgs);
+
+  mPrefSerializer = MakeUnique<ipc::SharedPreferenceSerializer>();
+  if (!mPrefSerializer->SerializeToSharedMemory(GeckoProcessType_VR,
+                                                /* remoteType */ ""_ns)) {
+    return false;
+  }
+  mPrefSerializer->AddSharedPrefCmdLineArgs(*this, extraArgs);
+
+  if (!GeckoChildProcessHost::AsyncLaunch(extraArgs)) {
+    mLaunchPhase = LaunchPhase::Complete;
+    mPrefSerializer = nullptr;
+    return false;
+  }
+  return true;
+}
+
+bool VRProcessParent::WaitForLaunch() {
+  if (mLaunchPhase == LaunchPhase::Complete) {
+    return !!mVRChild;
+  }
+
+  int32_t timeoutMs =
+      StaticPrefs::dom_vr_process_startup_timeout_ms_AtStartup();
+
+  // If one of the following environment variables are set we can effectively
+  // ignore the timeout - as we can guarantee the compositor process will be
+  // terminated
+  if (PR_GetEnv("MOZ_DEBUG_CHILD_PROCESS") ||
+      PR_GetEnv("MOZ_DEBUG_CHILD_PAUSE")) {
+    timeoutMs = 0;
+  }
+
+  // Our caller expects the connection to be finished after we return, so we
+  // immediately set up the IPDL actor and fire callbacks. The IO thread will
+  // still dispatch a notification to the main thread - we'll just ignore it.
+  bool result = GeckoChildProcessHost::WaitUntilConnected(timeoutMs);
+  result &= InitAfterConnect(result);
+  return result;
+}
+
+void VRProcessParent::Shutdown() {
+  MOZ_ASSERT(!mShutdownRequested);
+  mListener = nullptr;
+
+  if (mVRChild) {
+    // The channel might already be closed if we got here unexpectedly.
+    if (!mChannelClosed) {
+      mVRChild->Close();
+    }
+    // OnChannelClosed uses this to check if the shutdown was expected or
+    // unexpected.
+    mShutdownRequested = true;
+
+#ifndef NS_FREE_PERMANENT_DATA
+    // No need to communicate shutdown, the VR process doesn't need to
+    // communicate anything back.
+    KillHard("NormalShutdown");
+#endif
+
+    // If we're shutting down unexpectedly, we're in the middle of handling an
+    // ActorDestroy for PVRChild, which is still on the stack. We'll return
+    // back to OnChannelClosed.
+    //
+    // Otherwise, we'll wait for OnChannelClose to be called whenever PVRChild
+    // acknowledges shutdown.
+    return;
+  }
+
+  DestroyProcess();
+}
+
+void VRProcessParent::DestroyProcess() {
+  if (mLaunchThread) {
+    // Cancel all tasks. We don't want anything triggering after our caller
+    // expects this to go away.
+    {
+      MonitorAutoLock lock(mMonitor);
+      mTaskFactory.RevokeAll();
+    }
+
+    mLaunchThread->Dispatch(NS_NewRunnableFunction("DestroyProcessRunnable",
+                                                   [this] { Destroy(); }));
+  }
+}
+
+bool VRProcessParent::InitAfterConnect(bool aSucceeded) {
+  MOZ_ASSERT(mLaunchPhase == LaunchPhase::Waiting);
+  MOZ_ASSERT(!mVRChild);
+
+  mLaunchPhase = LaunchPhase::Complete;
+  mPrefSerializer = nullptr;
+
+  if (aSucceeded) {
+    GPUChild* gpuChild = GPUProcessManager::Get()->GetGPUChild();
+    if (!gpuChild) {
+      NS_WARNING(
+          "GPU process haven't connected with the parent process yet"
+          "when creating VR process.");
+      return false;
+    }
+
+    if (!StaticPrefs::dom_vr_enabled() &&
+        !StaticPrefs::dom_vr_webxr_enabled()) {
+      NS_WARNING("VR is not enabled when trying to create a VRChild");
+      return false;
+    }
+
+    mVRChild = MakeRefPtr<VRChild>(this);
+
+    DebugOnly<bool> rv = TakeInitialEndpoint().Bind(mVRChild.get());
+    MOZ_ASSERT(rv);
+
+    mVRChild->Init();
+
+    if (mListener) {
+      mListener->OnProcessLaunchComplete(this);
+    }
+
+    // Make vr-gpu process connection
+    Endpoint<PVRGPUChild> vrGPUBridge;
+    VRProcessManager* vpm = VRProcessManager::Get();
+    DebugOnly<bool> opened =
+        vpm->CreateGPUBridges(gpuChild->OtherPid(), &vrGPUBridge);
+    MOZ_ASSERT(opened);
+
+    Unused << gpuChild->SendInitVR(std::move(vrGPUBridge));
+  }
+
+  return true;
+}
+
+void VRProcessParent::KillHard(const char* aReason) {
+  ProcessHandle handle = GetChildProcessHandle();
+  if (!base::KillProcess(handle, base::PROCESS_END_KILLED_BY_USER)) {
+    NS_WARNING("failed to kill subprocess!");
+  }
+
+  SetAlreadyDead();
+}
+
+void VRProcessParent::OnChannelError() {
+  MOZ_ASSERT(false, "VR process channel error.");
+}
+
+void VRProcessParent::OnChannelConnected(base::ProcessId peer_pid) {
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  GeckoChildProcessHost::OnChannelConnected(peer_pid);
+
+  // Post a task to the main thread. Take the lock because mTaskFactory is not
+  // thread-safe.
+  RefPtr<Runnable> runnable;
+  {
+    MonitorAutoLock lock(mMonitor);
+    runnable = mTaskFactory.NewRunnableMethod(
+        &VRProcessParent::OnChannelConnectedTask);
+  }
+  NS_DispatchToMainThread(runnable);
+}
+
+void VRProcessParent::OnChannelConnectedTask() {
+  if (mLaunchPhase == LaunchPhase::Waiting) {
+    InitAfterConnect(true);
+  }
+}
+
+void VRProcessParent::OnChannelErrorTask() {
+  if (mLaunchPhase == LaunchPhase::Waiting) {
+    InitAfterConnect(false);
+  }
+}
+
+void VRProcessParent::OnChannelClosed() {
+  mChannelClosed = true;
+  if (!mShutdownRequested && mListener) {
+    // This is an unclean shutdown. Notify we're going away.
+    mListener->OnProcessUnexpectedShutdown(this);
+  } else {
+    DestroyProcess();
+  }
+
+  // Release the actor.
+  VRChild::Destroy(std::move(mVRChild));
+  MOZ_ASSERT(!mVRChild);
+}
+
+base::ProcessId VRProcessParent::OtherPid() { return mVRChild->OtherPid(); }
+
+bool VRProcessParent::IsConnected() const { return !!mVRChild; }
+
+}  // namespace gfx
+}  // namespace mozilla
diff --git a/gfx/vr/ipc/VRProcessParent.h b/gfx/vr/ipc/VRProcessParent.h
new file mode 100644
index 0000000000..acbd0a26e2
--- /dev/null
+++ b/gfx/vr/ipc/VRProcessParent.h
@@ -0,0 +1,87 @@
+/* -*- 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 GFX_VR_PROCESS_PARENT_H
+#define GFX_VR_PROCESS_PARENT_H
+
+#include "mozilla/UniquePtr.h"
+
+#include "mozilla/ipc/GeckoChildProcessHost.h"
+#include "mozilla/ipc/TaskFactory.h"
+
+namespace mozilla {
+namespace ipc {
+class SharedPreferenceSerializer;
+}
+namespace gfx {
+
+class VRChild;
+
+class VRProcessParent final : public mozilla::ipc::GeckoChildProcessHost {
+ public:
+  class Listener {
+   public:
+    virtual void OnProcessLaunchComplete(VRProcessParent* aParent) {}
+
+    // Follow GPU and RDD process manager, adding this to avoid
+    // unexpectedly shutdown or had its connection severed.
+    // This is not called if an error occurs after calling Shutdown().
+    virtual void OnProcessUnexpectedShutdown(VRProcessParent* aParent) {}
+  };
+
+  explicit VRProcessParent(Listener* aListener);
+
+  // Launch the subprocess asynchronously. On failure, false is returned.
+  // Otherwise, true is returned, and the OnProcessLaunchComplete listener
+  // callback will be invoked either when a connection has been established, or
+  // if a connection could not be established due to an asynchronous error.
+  bool Launch();
+  // If the process is being launched, block until it has launched and
+  // connected. If a launch task is pending, it will fire immediately.
+  //
+  // Returns true if the process is successfully connected; false otherwise.
+  bool WaitForLaunch();
+  void Shutdown();
+  void DestroyProcess();
+  bool CanShutdown() override { return true; }
+
+  void OnChannelError() override;
+  void OnChannelConnected(base::ProcessId peer_pid) override;
+  void OnChannelConnectedTask();
+  void OnChannelErrorTask();
+  void OnChannelClosed();
+  bool IsConnected() const;
+
+  base::ProcessId OtherPid();
+  VRChild* GetActor() const { return mVRChild.get(); }
+  // Return a unique id for this process, guaranteed not to be shared with any
+  // past or future instance of VRProcessParent.
+  uint64_t GetProcessToken() const;
+
+ private:
+  ~VRProcessParent();
+
+  DISALLOW_COPY_AND_ASSIGN(VRProcessParent);
+
+  bool InitAfterConnect(bool aSucceeded);
+  void KillHard(const char* aReason);
+
+  RefPtr<VRChild> mVRChild;
+  mozilla::ipc::TaskFactory<VRProcessParent> mTaskFactory;
+  nsCOMPtr<nsIThread> mLaunchThread;
+  Listener* mListener;
+
+  enum class LaunchPhase { Unlaunched, Waiting, Complete };
+  LaunchPhase mLaunchPhase;
+  bool mChannelClosed;
+  bool mShutdownRequested;
+  UniquePtr<mozilla::ipc::SharedPreferenceSerializer> mPrefSerializer;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // ifndef GFX_VR_PROCESS_PARENT_H