1 files changed, 675 insertions, 0 deletions
diff --git a/dom/ipc/WindowGlobalChild.cpp b/dom/ipc/WindowGlobalChild.cpp
new file mode 100644
index 0000000000..ef4094e444
--- /dev/null
+++ b/dom/ipc/WindowGlobalChild.cpp
@@ -0,0 +1,675 @@
+/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
+/* vim: set sw=2 ts=8 et tw=80 ft=cpp : */
+/* 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 "mozilla/dom/WindowGlobalChild.h"
+
+#include "mozilla/AntiTrackingUtils.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/dom/WindowGlobalParent.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/BrowsingContextGroup.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/MozFrameLoaderOwnerBinding.h"
+#include "mozilla/dom/BrowserChild.h"
+#include "mozilla/dom/BrowserBridgeChild.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/SecurityPolicyViolationEvent.h"
+#include "mozilla/dom/SessionStoreRestoreData.h"
+#include "mozilla/dom/WindowGlobalActorsBinding.h"
+#include "mozilla/dom/WindowContext.h"
+#include "mozilla/dom/InProcessChild.h"
+#include "mozilla/dom/InProcessParent.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/ScopeExit.h"
+#include "GeckoProfiler.h"
+#include "nsContentUtils.h"
+#include "nsDocShell.h"
+#include "nsFocusManager.h"
+#include "nsFrameLoaderOwner.h"
+#include "nsGlobalWindowInner.h"
+#include "nsNetUtil.h"
+#include "nsQueryObject.h"
+#include "nsSerializationHelper.h"
+#include "nsFrameLoader.h"
+
+#include "mozilla/dom/JSWindowActorBinding.h"
+#include "mozilla/dom/JSWindowActorChild.h"
+#include "mozilla/dom/JSActorService.h"
+#include "nsIHttpChannelInternal.h"
+#include "nsIURIMutator.h"
+
+using namespace mozilla::ipc;
+using namespace mozilla::dom::ipc;
+
+namespace mozilla::dom {
+
+WindowGlobalChild::WindowGlobalChild(dom::WindowContext* aWindowContext,
+                                     nsIPrincipal* aPrincipal,
+                                     nsIURI* aDocumentURI)
+    : mWindowContext(aWindowContext),
+      mDocumentPrincipal(aPrincipal),
+      mDocumentURI(aDocumentURI) {
+  MOZ_DIAGNOSTIC_ASSERT(mWindowContext);
+  MOZ_DIAGNOSTIC_ASSERT(mDocumentPrincipal);
+
+  if (!mDocumentURI) {
+    NS_NewURI(getter_AddRefs(mDocumentURI), "about:blank");
+  }
+
+  // Registers a DOM Window with the profiler. It re-registers the same Inner
+  // Window ID with different URIs because when a Browsing context is first
+  // loaded, the first url loaded in it will be about:blank. This call keeps the
+  // first non-about:blank registration of window and discards the previous one.
+  uint64_t embedderInnerWindowID = 0;
+  if (BrowsingContext()->GetParent()) {
+    embedderInnerWindowID = BrowsingContext()->GetEmbedderInnerWindowId();
+  }
+  profiler_register_page(BrowsingContext()->BrowserId(), InnerWindowId(),
+                         aDocumentURI->GetSpecOrDefault(),
+                         embedderInnerWindowID,
+                         BrowsingContext()->UsePrivateBrowsing());
+}
+
+already_AddRefed<WindowGlobalChild> WindowGlobalChild::Create(
+    nsGlobalWindowInner* aWindow) {
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  // Opener policy is set when we start to load a document. Here, we ensure we
+  // have set the correct Opener policy so that it will be available in the
+  // parent process through window global child.
+  nsCOMPtr<nsIChannel> chan = aWindow->GetDocument()->GetChannel();
+  nsCOMPtr<nsILoadInfo> loadInfo = chan ? chan->LoadInfo() : nullptr;
+  nsCOMPtr<nsIHttpChannelInternal> httpChan = do_QueryInterface(chan);
+  nsILoadInfo::CrossOriginOpenerPolicy policy;
+  if (httpChan &&
+      loadInfo->GetExternalContentPolicyType() ==
+          ExtContentPolicy::TYPE_DOCUMENT &&
+      NS_SUCCEEDED(httpChan->GetCrossOriginOpenerPolicy(&policy))) {
+    MOZ_DIAGNOSTIC_ASSERT(policy ==
+                          aWindow->GetBrowsingContext()->GetOpenerPolicy());
+  }
+#endif
+
+  WindowGlobalInit init = WindowGlobalActor::WindowInitializer(aWindow);
+  RefPtr<WindowGlobalChild> wgc = CreateDisconnected(init);
+
+  // Send the link constructor over PBrowser, or link over PInProcess.
+  if (XRE_IsParentProcess()) {
+    InProcessChild* ipChild = InProcessChild::Singleton();
+    InProcessParent* ipParent = InProcessParent::Singleton();
+    if (!ipChild || !ipParent) {
+      return nullptr;
+    }
+
+    ManagedEndpoint<PWindowGlobalParent> endpoint =
+        ipChild->OpenPWindowGlobalEndpoint(wgc);
+    ipParent->BindPWindowGlobalEndpoint(std::move(endpoint),
+                                        wgc->WindowContext()->Canonical());
+  } else {
+    RefPtr<BrowserChild> browserChild =
+        BrowserChild::GetFrom(static_cast<mozIDOMWindow*>(aWindow));
+    MOZ_ASSERT(browserChild);
+
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    dom::BrowsingContext* bc = aWindow->GetBrowsingContext();
+#endif
+
+    MOZ_DIAGNOSTIC_ASSERT(bc->AncestorsAreCurrent());
+    MOZ_DIAGNOSTIC_ASSERT(bc->IsInProcess());
+
+    ManagedEndpoint<PWindowGlobalParent> endpoint =
+        browserChild->OpenPWindowGlobalEndpoint(wgc);
+    browserChild->SendNewWindowGlobal(std::move(endpoint), init);
+  }
+
+  wgc->Init();
+  wgc->InitWindowGlobal(aWindow);
+  return wgc.forget();
+}
+
+already_AddRefed<WindowGlobalChild> WindowGlobalChild::CreateDisconnected(
+    const WindowGlobalInit& aInit) {
+  RefPtr<dom::BrowsingContext> browsingContext =
+      dom::BrowsingContext::Get(aInit.context().mBrowsingContextId);
+
+  RefPtr<dom::WindowContext> windowContext =
+      dom::WindowContext::GetById(aInit.context().mInnerWindowId);
+  MOZ_RELEASE_ASSERT(!windowContext, "Creating duplicate WindowContext");
+
+  // Create our new WindowContext
+  if (XRE_IsParentProcess()) {
+    windowContext = WindowGlobalParent::CreateDisconnected(aInit);
+  } else {
+    dom::WindowContext::FieldValues fields = aInit.context().mFields;
+    windowContext = new dom::WindowContext(
+        browsingContext, aInit.context().mInnerWindowId,
+        aInit.context().mOuterWindowId, std::move(fields));
+  }
+
+  RefPtr<WindowGlobalChild> windowChild = new WindowGlobalChild(
+      windowContext, aInit.principal(), aInit.documentURI());
+  windowContext->mIsInProcess = true;
+  windowContext->mWindowGlobalChild = windowChild;
+  return windowChild.forget();
+}
+
+void WindowGlobalChild::Init() {
+  MOZ_ASSERT(mWindowContext->mWindowGlobalChild == this);
+  mWindowContext->Init();
+}
+
+void WindowGlobalChild::InitWindowGlobal(nsGlobalWindowInner* aWindow) {
+  mWindowGlobal = aWindow;
+}
+
+void WindowGlobalChild::OnNewDocument(Document* aDocument) {
+  MOZ_RELEASE_ASSERT(mWindowGlobal);
+  MOZ_RELEASE_ASSERT(aDocument);
+
+  // Send a series of messages to update document-specific state on
+  // WindowGlobalParent, when we change documents on an existing WindowGlobal.
+  // This data is also all sent when we construct a WindowGlobal, so anything
+  // added here should also be added to WindowGlobalActor::WindowInitializer.
+
+  // FIXME: Perhaps these should be combined into a smaller number of messages?
+  SendSetIsInitialDocument(aDocument->IsInitialDocument());
+  SetDocumentURI(aDocument->GetDocumentURI());
+  SetDocumentPrincipal(aDocument->NodePrincipal(),
+                       aDocument->EffectiveStoragePrincipal());
+
+  nsCOMPtr<nsITransportSecurityInfo> securityInfo;
+  if (nsCOMPtr<nsIChannel> channel = aDocument->GetChannel()) {
+    channel->GetSecurityInfo(getter_AddRefs(securityInfo));
+  }
+  SendUpdateDocumentSecurityInfo(securityInfo);
+
+  SendUpdateDocumentCspSettings(aDocument->GetBlockAllMixedContent(false),
+                                aDocument->GetUpgradeInsecureRequests(false));
+  SendUpdateSandboxFlags(aDocument->GetSandboxFlags());
+
+  net::CookieJarSettingsArgs csArgs;
+  net::CookieJarSettings::Cast(aDocument->CookieJarSettings())
+      ->Serialize(csArgs);
+  if (!SendUpdateCookieJarSettings(csArgs)) {
+    NS_WARNING(
+        "Failed to update document's cookie jar settings on the "
+        "WindowGlobalParent");
+  }
+
+  SendUpdateHttpsOnlyStatus(aDocument->HttpsOnlyStatus());
+
+  // Update window context fields for the newly loaded Document.
+  WindowContext::Transaction txn;
+  txn.SetCookieBehavior(
+      Some(aDocument->CookieJarSettings()->GetCookieBehavior()));
+  txn.SetIsOnContentBlockingAllowList(
+      aDocument->CookieJarSettings()->GetIsOnContentBlockingAllowList());
+  txn.SetIsThirdPartyWindow(aDocument->HasThirdPartyChannel());
+  txn.SetIsThirdPartyTrackingResourceWindow(
+      nsContentUtils::IsThirdPartyTrackingResourceWindow(mWindowGlobal));
+  txn.SetIsSecureContext(mWindowGlobal->IsSecureContext());
+  if (auto policy = aDocument->GetEmbedderPolicy()) {
+    txn.SetEmbedderPolicy(*policy);
+  }
+
+  if (nsCOMPtr<nsIChannel> channel = aDocument->GetChannel()) {
+    nsCOMPtr<nsILoadInfo> loadInfo(channel->LoadInfo());
+    txn.SetIsOriginalFrameSource(loadInfo->GetOriginalFrameSrcLoad());
+  } else {
+    txn.SetIsOriginalFrameSource(false);
+  }
+
+  // Init Mixed Content Fields
+  nsCOMPtr<nsIURI> innerDocURI =
+      NS_GetInnermostURI(aDocument->GetDocumentURI());
+  if (innerDocURI) {
+    txn.SetIsSecure(innerDocURI->SchemeIs("https"));
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(mDocumentPrincipal->GetIsLocalIpAddress() ==
+                        mWindowContext->IsLocalIP());
+
+  MOZ_ALWAYS_SUCCEEDS(txn.Commit(mWindowContext));
+}
+
+/* static */
+already_AddRefed<WindowGlobalChild> WindowGlobalChild::GetByInnerWindowId(
+    uint64_t aInnerWindowId) {
+  if (RefPtr<dom::WindowContext> context =
+          dom::WindowContext::GetById(aInnerWindowId)) {
+    return do_AddRef(context->GetWindowGlobalChild());
+  }
+  return nullptr;
+}
+
+dom::BrowsingContext* WindowGlobalChild::BrowsingContext() {
+  return mWindowContext->GetBrowsingContext();
+}
+
+uint64_t WindowGlobalChild::InnerWindowId() {
+  return mWindowContext->InnerWindowId();
+}
+
+uint64_t WindowGlobalChild::OuterWindowId() {
+  return mWindowContext->OuterWindowId();
+}
+
+bool WindowGlobalChild::IsCurrentGlobal() {
+  return CanSend() && mWindowGlobal->IsCurrentInnerWindow();
+}
+
+already_AddRefed<WindowGlobalParent> WindowGlobalChild::GetParentActor() {
+  if (!CanSend()) {
+    return nullptr;
+  }
+  IProtocol* otherSide = InProcessChild::ParentActorFor(this);
+  return do_AddRef(static_cast<WindowGlobalParent*>(otherSide));
+}
+
+already_AddRefed<BrowserChild> WindowGlobalChild::GetBrowserChild() {
+  if (IsInProcess() || !CanSend()) {
+    return nullptr;
+  }
+  return do_AddRef(static_cast<BrowserChild*>(Manager()));
+}
+
+uint64_t WindowGlobalChild::ContentParentId() {
+  if (XRE_IsParentProcess()) {
+    return 0;
+  }
+  return ContentChild::GetSingleton()->GetID();
+}
+
+// A WindowGlobalChild is the root in its process if it has no parent, or its
+// embedder is in a different process.
+bool WindowGlobalChild::IsProcessRoot() {
+  if (!BrowsingContext()->GetParent()) {
+    return true;
+  }
+
+  return !BrowsingContext()->GetEmbedderElement();
+}
+
+void WindowGlobalChild::BeforeUnloadAdded() {
+  // Don't bother notifying the parent if we don't have an IPC link open.
+  if (mBeforeUnloadListeners == 0 && CanSend()) {
+    Unused << mWindowContext->SetHasBeforeUnload(true);
+  }
+
+  mBeforeUnloadListeners++;
+  MOZ_ASSERT(mBeforeUnloadListeners > 0);
+}
+
+void WindowGlobalChild::BeforeUnloadRemoved() {
+  mBeforeUnloadListeners--;
+  MOZ_ASSERT(mBeforeUnloadListeners >= 0);
+
+  if (mBeforeUnloadListeners == 0) {
+    Unused << mWindowContext->SetHasBeforeUnload(false);
+  }
+}
+
+void WindowGlobalChild::Destroy() {
+  JSActorWillDestroy();
+
+  mWindowContext->Discard();
+
+  // Perform async IPC shutdown unless we're not in-process, and our
+  // BrowserChild is in the process of being destroyed, which will destroy
+  // us as well.
+  RefPtr<BrowserChild> browserChild = GetBrowserChild();
+  if (!browserChild || !browserChild->IsDestroyed()) {
+    SendDestroy();
+  }
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvMakeFrameLocal(
+    const MaybeDiscarded<dom::BrowsingContext>& aFrameContext,
+    uint64_t aPendingSwitchId) {
+  MOZ_DIAGNOSTIC_ASSERT(XRE_IsContentProcess());
+
+  MOZ_LOG(BrowsingContext::GetLog(), LogLevel::Debug,
+          ("RecvMakeFrameLocal ID=%" PRIx64, aFrameContext.ContextId()));
+
+  if (NS_WARN_IF(aFrameContext.IsNullOrDiscarded())) {
+    return IPC_OK();
+  }
+  dom::BrowsingContext* frameContext = aFrameContext.get();
+
+  RefPtr<Element> embedderElt = frameContext->GetEmbedderElement();
+  if (NS_WARN_IF(!embedderElt)) {
+    return IPC_OK();
+  }
+
+  if (NS_WARN_IF(embedderElt->GetOwnerGlobal() != GetWindowGlobal())) {
+    return IPC_OK();
+  }
+
+  RefPtr<nsFrameLoaderOwner> flo = do_QueryObject(embedderElt);
+  MOZ_DIAGNOSTIC_ASSERT(flo, "Embedder must be a nsFrameLoaderOwner");
+
+  // Trigger a process switch into the current process.
+  RemotenessOptions options;
+  options.mRemoteType = NOT_REMOTE_TYPE;
+  options.mPendingSwitchID.Construct(aPendingSwitchId);
+  options.mSwitchingInProgressLoad = true;
+  flo->ChangeRemoteness(options, IgnoreErrors());
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvMakeFrameRemote(
+    const MaybeDiscarded<dom::BrowsingContext>& aFrameContext,
+    ManagedEndpoint<PBrowserBridgeChild>&& aEndpoint, const TabId& aTabId,
+    const LayersId& aLayersId, MakeFrameRemoteResolver&& aResolve) {
+  MOZ_DIAGNOSTIC_ASSERT(XRE_IsContentProcess());
+
+  MOZ_LOG(BrowsingContext::GetLog(), LogLevel::Debug,
+          ("RecvMakeFrameRemote ID=%" PRIx64, aFrameContext.ContextId()));
+
+  if (!aLayersId.IsValid()) {
+    return IPC_FAIL(this, "Received an invalid LayersId");
+  }
+
+  // Resolve the promise when this function exits, as we'll have fully unloaded
+  // at that point.
+  auto scopeExit = MakeScopeExit([&] { aResolve(true); });
+
+  // Get a BrowsingContext if we're not null or discarded. We don't want to
+  // early-return before we connect the BrowserBridgeChild, as otherwise we'll
+  // never break the channel in the parent.
+  RefPtr<dom::BrowsingContext> frameContext;
+  if (!aFrameContext.IsDiscarded()) {
+    frameContext = aFrameContext.get();
+  }
+
+  // Immediately construct the BrowserBridgeChild so we can destroy it cleanly
+  // if the process switch fails.
+  RefPtr<BrowserBridgeChild> bridge =
+      new BrowserBridgeChild(frameContext, aTabId, aLayersId);
+  RefPtr<BrowserChild> manager = GetBrowserChild();
+  if (NS_WARN_IF(
+          !manager->BindPBrowserBridgeEndpoint(std::move(aEndpoint), bridge))) {
+    return IPC_OK();
+  }
+
+  // Synchronously delete de actor here rather than using SendBeginDestroy(), as
+  // we haven't initialized it yet.
+  auto deleteBridge =
+      MakeScopeExit([&] { BrowserBridgeChild::Send__delete__(bridge); });
+
+  // Immediately tear down the actor if we don't have a valid FrameContext.
+  if (NS_WARN_IF(aFrameContext.IsNullOrDiscarded())) {
+    return IPC_OK();
+  }
+
+  RefPtr<Element> embedderElt = frameContext->GetEmbedderElement();
+  if (NS_WARN_IF(!embedderElt)) {
+    return IPC_OK();
+  }
+
+  if (NS_WARN_IF(embedderElt->GetOwnerGlobal() != GetWindowGlobal())) {
+    return IPC_OK();
+  }
+
+  RefPtr<nsFrameLoaderOwner> flo = do_QueryObject(embedderElt);
+  MOZ_DIAGNOSTIC_ASSERT(flo, "Embedder must be a nsFrameLoaderOwner");
+
+  // Trgger a process switch into the specified process.
+  IgnoredErrorResult rv;
+  flo->ChangeRemotenessWithBridge(bridge, rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    return IPC_OK();
+  }
+
+  // Everything succeeded, so don't delete the bridge.
+  deleteBridge.release();
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvDrawSnapshot(
+    const Maybe<IntRect>& aRect, const float& aScale,
+    const nscolor& aBackgroundColor, const uint32_t& aFlags,
+    DrawSnapshotResolver&& aResolve) {
+  aResolve(gfx::PaintFragment::Record(BrowsingContext(), aRect, aScale,
+                                      aBackgroundColor,
+                                      (gfx::CrossProcessPaintFlags)aFlags));
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult
+WindowGlobalChild::RecvSaveStorageAccessPermissionGranted() {
+  nsCOMPtr<nsPIDOMWindowInner> inner = GetWindowGlobal();
+  if (inner) {
+    inner->SaveStorageAccessPermissionGranted();
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvDispatchSecurityPolicyViolation(
+    const nsString& aViolationEventJSON) {
+  nsGlobalWindowInner* window = GetWindowGlobal();
+  if (!window) {
+    return IPC_OK();
+  }
+
+  Document* doc = window->GetDocument();
+  if (!doc) {
+    return IPC_OK();
+  }
+
+  SecurityPolicyViolationEventInit violationEvent;
+  if (!violationEvent.Init(aViolationEventJSON)) {
+    return IPC_OK();
+  }
+
+  RefPtr<Event> event = SecurityPolicyViolationEvent::Constructor(
+      doc, u"securitypolicyviolation"_ns, violationEvent);
+  event->SetTrusted(true);
+  doc->DispatchEvent(*event, IgnoreErrors());
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvAddBlockedFrameNodeByClassifier(
+    const MaybeDiscardedBrowsingContext& aNode) {
+  if (aNode.IsNullOrDiscarded()) {
+    return IPC_OK();
+  }
+
+  nsGlobalWindowInner* window = GetWindowGlobal();
+  if (!window) {
+    return IPC_OK();
+  }
+
+  Document* doc = window->GetDocument();
+  if (!doc) {
+    return IPC_OK();
+  }
+
+  MOZ_ASSERT(aNode.get()->GetEmbedderElement()->OwnerDoc() == doc);
+  doc->AddBlockedNodeByClassifier(aNode.get()->GetEmbedderElement());
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvResetScalingZoom() {
+  if (Document* doc = mWindowGlobal->GetExtantDoc()) {
+    if (PresShell* ps = doc->GetPresShell()) {
+      ps->SetResolutionAndScaleTo(1.0,
+                                  ResolutionChangeOrigin::MainThreadAdjustment);
+    }
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvSetContainerFeaturePolicy(
+    dom::FeaturePolicy* aContainerFeaturePolicy) {
+  mContainerFeaturePolicy = aContainerFeaturePolicy;
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvRestoreDocShellState(
+    const dom::sessionstore::DocShellRestoreState& aState,
+    RestoreDocShellStateResolver&& aResolve) {
+  if (mWindowGlobal) {
+    SessionStoreUtils::RestoreDocShellState(mWindowGlobal->GetDocShell(),
+                                            aState);
+  }
+  aResolve(true);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult WindowGlobalChild::RecvRestoreTabContent(
+    dom::SessionStoreRestoreData* aData, RestoreTabContentResolver&& aResolve) {
+  aData->RestoreInto(BrowsingContext());
+  aResolve(true);
+  return IPC_OK();
+}
+
+IPCResult WindowGlobalChild::RecvRawMessage(
+    const JSActorMessageMeta& aMeta, const Maybe<ClonedMessageData>& aData,
+    const Maybe<ClonedMessageData>& aStack) {
+  Maybe<StructuredCloneData> data;
+  if (aData) {
+    data.emplace();
+    data->BorrowFromClonedMessageData(*aData);
+  }
+  Maybe<StructuredCloneData> stack;
+  if (aStack) {
+    stack.emplace();
+    stack->BorrowFromClonedMessageData(*aStack);
+  }
+  ReceiveRawMessage(aMeta, std::move(data), std::move(stack));
+  return IPC_OK();
+}
+
+void WindowGlobalChild::SetDocumentURI(nsIURI* aDocumentURI) {
+  // Registers a DOM Window with the profiler. It re-registers the same Inner
+  // Window ID with different URIs because when a Browsing context is first
+  // loaded, the first url loaded in it will be about:blank. This call keeps the
+  // first non-about:blank registration of window and discards the previous one.
+  uint64_t embedderInnerWindowID = 0;
+  if (BrowsingContext()->GetParent()) {
+    embedderInnerWindowID = BrowsingContext()->GetEmbedderInnerWindowId();
+  }
+  profiler_register_page(BrowsingContext()->BrowserId(), InnerWindowId(),
+                         aDocumentURI->GetSpecOrDefault(),
+                         embedderInnerWindowID,
+                         BrowsingContext()->UsePrivateBrowsing());
+  mDocumentURI = aDocumentURI;
+  SendUpdateDocumentURI(aDocumentURI);
+}
+
+void WindowGlobalChild::SetDocumentPrincipal(
+    nsIPrincipal* aNewDocumentPrincipal,
+    nsIPrincipal* aNewDocumentStoragePrincipal) {
+  MOZ_ASSERT(mDocumentPrincipal->Equals(aNewDocumentPrincipal));
+  mDocumentPrincipal = aNewDocumentPrincipal;
+  SendUpdateDocumentPrincipal(aNewDocumentPrincipal,
+                              aNewDocumentStoragePrincipal);
+}
+
+const nsACString& WindowGlobalChild::GetRemoteType() {
+  if (XRE_IsContentProcess()) {
+    return ContentChild::GetSingleton()->GetRemoteType();
+  }
+
+  return NOT_REMOTE_TYPE;
+}
+
+already_AddRefed<JSWindowActorChild> WindowGlobalChild::GetActor(
+    JSContext* aCx, const nsACString& aName, ErrorResult& aRv) {
+  return JSActorManager::GetActor(aCx, aName, aRv)
+      .downcast<JSWindowActorChild>();
+}
+
+already_AddRefed<JSWindowActorChild> WindowGlobalChild::GetExistingActor(
+    const nsACString& aName) {
+  return JSActorManager::GetExistingActor(aName).downcast<JSWindowActorChild>();
+}
+
+already_AddRefed<JSActor> WindowGlobalChild::InitJSActor(
+    JS::Handle<JSObject*> aMaybeActor, const nsACString& aName,
+    ErrorResult& aRv) {
+  RefPtr<JSWindowActorChild> actor;
+  if (aMaybeActor.get()) {
+    aRv = UNWRAP_OBJECT(JSWindowActorChild, aMaybeActor.get(), actor);
+    if (aRv.Failed()) {
+      return nullptr;
+    }
+  } else {
+    actor = new JSWindowActorChild();
+  }
+
+  MOZ_RELEASE_ASSERT(!actor->GetManager(),
+                     "mManager was already initialized once!");
+  actor->Init(aName, this);
+  return actor.forget();
+}
+
+void WindowGlobalChild::ActorDestroy(ActorDestroyReason aWhy) {
+  MOZ_ASSERT(nsContentUtils::IsSafeToRunScript(),
+             "Destroying WindowGlobalChild can run script");
+
+  // If our WindowContext hasn't been marked as discarded yet, ensure it's
+  // marked as discarded at this point.
+  mWindowContext->Discard();
+
+  profiler_unregister_page(InnerWindowId());
+
+  // Destroy our JSActors, and reject any pending queries.
+  JSActorDidDestroy();
+}
+
+bool WindowGlobalChild::IsSameOriginWith(
+    const dom::WindowContext* aOther) const {
+  if (aOther == WindowContext()) {
+    return true;
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(WindowContext()->Group() == aOther->Group());
+  if (nsGlobalWindowInner* otherWin = aOther->GetInnerWindow()) {
+    return mDocumentPrincipal->Equals(otherWin->GetPrincipal());
+  }
+  return false;
+}
+
+bool WindowGlobalChild::SameOriginWithTop() {
+  return IsSameOriginWith(WindowContext()->TopWindowContext());
+}
+
+void WindowGlobalChild::UnblockBFCacheFor(BFCacheStatus aStatus) {
+  SendUpdateBFCacheStatus(0, aStatus);
+}
+
+void WindowGlobalChild::BlockBFCacheFor(BFCacheStatus aStatus) {
+  SendUpdateBFCacheStatus(aStatus, 0);
+}
+
+WindowGlobalChild::~WindowGlobalChild() = default;
+
+JSObject* WindowGlobalChild::WrapObject(JSContext* aCx,
+                                        JS::Handle<JSObject*> aGivenProto) {
+  return WindowGlobalChild_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+nsISupports* WindowGlobalChild::GetParentObject() {
+  return xpc::NativeGlobal(xpc::PrivilegedJunkScope());
+}
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_WEAK_PTR(WindowGlobalChild, mWindowGlobal,
+                                               mContainerFeaturePolicy,
+                                               mWindowContext)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(WindowGlobalChild)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(WindowGlobalChild)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(WindowGlobalChild)
+
+}  // namespace mozilla::dom