Bug 1722880 - Part 2: Expose windowContext getter to JSWindowActors, r=smaug

This will be used by the Pdfjs actor to get isInBFCache

Differential Revision: https://phabricator.services.mozilla.com/D124099

dom/chrome-webidl/JSWindowActor.webidl

@@ -27,6 +27,14 @@ interface JSWindowActorParent {
    */
   readonly attribute WindowGlobalParent? manager;
 
+  /**
+   * The WindowContext associated with this JSWindowActorParent. For
+   * JSWindowActorParent this is identical to `manager`, but is also exposed as
+   * `windowContext` for consistency with `JSWindowActorChild`. Until the actor
+   * is initialized, accesses to windowContext will fail.
+   */
+  readonly attribute WindowContext? windowContext;
+
   [Throws]
   readonly attribute CanonicalBrowsingContext? browsingContext;
 };
@@ -44,6 +52,12 @@ interface JSWindowActorChild {
    */
   readonly attribute WindowGlobalChild? manager;
 
+  /**
+   * The WindowContext associated with this JSWindowActorChild. Until the actor
+   * is initialized, accesses to windowContext will fail.
+   */
+  readonly attribute WindowContext? windowContext;
+
   [Throws]
   readonly attribute Document? document;
 

dom/ipc/jsactor/JSWindowActorChild.cpp

@@ -25,6 +25,10 @@ JSObject* JSWindowActorChild::WrapObject(JSContext* aCx,
 
 WindowGlobalChild* JSWindowActorChild::GetManager() const { return mManager; }
 
+WindowContext* JSWindowActorChild::GetWindowContext() const {
+  return mManager ? mManager->WindowContext() : nullptr;
+}
+
 void JSWindowActorChild::Init(const nsACString& aName,
                               WindowGlobalChild* aManager) {
   MOZ_ASSERT(!mManager, "Cannot Init() a JSWindowActorChild twice!");

dom/ipc/jsactor/JSWindowActorChild.h

@@ -57,6 +57,7 @@ class JSWindowActorChild final : public JSActor {
   }
 
   WindowGlobalChild* GetManager() const;
+  WindowContext* GetWindowContext() const;
   void Init(const nsACString& aName, WindowGlobalChild* aManager);
   void ClearManager() override;
   Document* GetDocument(ErrorResult& aRv);

dom/ipc/jsactor/JSWindowActorParent.cpp

@@ -23,6 +23,10 @@ JSObject* JSWindowActorParent::WrapObject(JSContext* aCx,
 
 WindowGlobalParent* JSWindowActorParent::GetManager() const { return mManager; }
 
+WindowContext* JSWindowActorParent::GetWindowContext() const {
+  return mManager;
+}
+
 void JSWindowActorParent::Init(const nsACString& aName,
                                WindowGlobalParent* aManager) {
   MOZ_ASSERT(!mManager, "Cannot Init() a JSWindowActorParent twice!");

dom/ipc/jsactor/JSWindowActorParent.h

@@ -46,6 +46,7 @@ class JSWindowActorParent final : public JSActor {
   }
 
   WindowGlobalParent* GetManager() const;
+  WindowContext* GetWindowContext() const;
   void Init(const nsACString& aName, WindowGlobalParent* aManager);
   void ClearManager() override;
   CanonicalBrowsingContext* GetBrowsingContext(ErrorResult& aRv);