[Presentation API] OffscreenPresentationManager should only interact with top level receiver frame

content/browser/presentation/presentation_service_impl.h

Index: content/browser/presentation/presentation_service_impl.h
diff --git a/content/browser/presentation/presentation_service_impl.h b/content/browser/presentation/presentation_service_impl.h
index c097ad93ee954462c9bb83e4e4b1c1976eeafa61..4c6393dfa4c2234aace6eeb5245ae09ac10c1f13 100644
--- a/content/browser/presentation/presentation_service_impl.h
+++ b/content/browser/presentation/presentation_service_impl.h
@@ -103,6 +103,8 @@ class CONTENT_EXPORT PresentationServiceImpl
                            MaxPendingReconnectPresentationRequests);
   FRIEND_TEST_ALL_PREFIXES(PresentationServiceImplTest,
                            ReceiverPresentationServiceDelegate);
+  FRIEND_TEST_ALL_PREFIXES(PresentationServiceImplTest,
+                           ReceiverDelegateOnSubFrame);
 
   // Maximum number of pending ReconnectPresentation requests at any given time.
   static const int kMaxQueuedRequests = 10;
@@ -278,6 +280,9 @@ class CONTENT_EXPORT PresentationServiceImpl
   int render_process_id_;
   int render_frame_id_;
 
+  // If current frame is top level frame.
+  bool is_main_frame_;
+
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<PresentationServiceImpl> weak_factory_;