Bug 1542781 - Expose browsingContext on FrameLoaderOwner, r=farre

Differential Revision: https://phabricator.services.mozilla.com/D26548

--HG--
extra : moz-landing-system : lando

dom/base/nsFrameLoaderOwner.cpp

@@ -7,6 +7,7 @@
 #include "nsFrameLoaderOwner.h"
 #include "nsFrameLoader.h"
 #include "mozilla/dom/FrameLoaderBinding.h"
+#include "mozilla/dom/BrowsingContext.h"
 
 already_AddRefed<nsFrameLoader> nsFrameLoaderOwner::GetFrameLoader() {
   return do_AddRef(mFrameLoader);
@@ -16,6 +17,14 @@ void nsFrameLoaderOwner::SetFrameLoader(nsFrameLoader* aNewFrameLoader) {
   mFrameLoader = aNewFrameLoader;
 }
 
+already_AddRefed<mozilla::dom::BrowsingContext>
+nsFrameLoaderOwner::GetBrowsingContext() {
+  if (mFrameLoader) {
+    return mFrameLoader->GetBrowsingContext();
+  }
+  return nullptr;
+}
+
 void nsFrameLoaderOwner::ChangeRemoteness(
     const mozilla::dom::RemotenessOptions& aOptions, mozilla::ErrorResult& rv) {
   // If we already have a Frameloader, destroy it.

dom/base/nsFrameLoaderOwner.h

@@ -11,8 +11,9 @@ class nsFrameLoader;
 namespace mozilla {
 class ErrorResult;
 namespace dom {
+class BrowsingContext;
 struct RemotenessOptions;
-}
+}  // namespace dom
 }  // namespace mozilla
 
 // IID for the FrameLoaderOwner interface
@@ -38,6 +39,8 @@ class nsFrameLoaderOwner : public nsISupports {
   already_AddRefed<nsFrameLoader> GetFrameLoader();
   void SetFrameLoader(nsFrameLoader* aNewFrameLoader);
 
+  already_AddRefed<mozilla::dom::BrowsingContext> GetBrowsingContext();
+
   // Destroy (if it exists) and recreate our frameloader, based on new
   // remoteness requirements. This should follow the same path as
   // tabbrowser.js's updateBrowserRemoteness, including running the same logic

dom/webidl/MozFrameLoaderOwner.webidl

@@ -15,6 +15,9 @@ interface MozFrameLoaderOwner {
   [ChromeOnly]
   readonly attribute FrameLoader? frameLoader;
 
+  [ChromeOnly]
+  readonly attribute BrowsingContext? browsingContext;
+
   [ChromeOnly, Throws]
   void presetOpenerWindow(WindowProxy? window);