Detect change on the intersection of video and viewport.

media/remoting/remoting_renderer_controller.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_REMOTING_REMOTING_RENDERER_CONTROLLER_H_
 #define MEDIA_REMOTING_REMOTING_RENDERER_CONTROLLER_H_
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/media_observer.h"
@@ skipping 17 matching lines @@
       scoped_refptr<RemotingSourceImpl> remoting_source);
   ~RemotingRendererController() override;
 
   // RemotingSourceImpl::Client implemenations.
   void OnStarted(bool success) override;
   void OnSessionStateChanged() override;
 
   // MediaObserver implementations.
   void OnEnteredFullscreen() override;
   void OnExitedFullscreen() override;
+  void OnBecameDominantVisibleContent(bool is_dominant) override;
   void OnSetCdm(CdmContext* cdm_context) override;
   void OnMetadataChanged(const PipelineMetadata& metadata) override;
   void OnRemotePlaybackDisabled(bool disabled) override;
 
   void SetSwitchRendererCallback(const base::Closure& cb);
 
   base::WeakPtr<RemotingRendererController> GetWeakPtr() {
     return weak_factory_.GetWeakPtr();
   }
 
@@ skipping 58 matching lines @@
 
   // Indicates whether remote playback is currently disabled. This starts out as
   // true, and should be updated at least once via a call to
   // OnRemotePlaybackDisabled() at some point in the future. A web page
   // typically sets/removes the disableRemotePlayback attribute on a
   // HTMLMediaElement to disable/enable remoting of its content. Please see the
   // Remote Playback API spec for more details:
   // https://w3c.github.io/remote-playback
   bool is_remote_playback_disabled_ = true;
 
+  // Indicates whether video is the dominant visible content in the tab.
+  bool is_dominant_content_ = false;
+
   // The callback to switch the media renderer.
   base::Closure switch_renderer_cb_;
 
   // This is initially the RemotingSourceImpl passed to the ctor, and might be
   // replaced with a different instance later if OnSetCdm() is called.
   scoped_refptr<RemotingSourceImpl> remoting_source_;
 
   // This is used to check all the methods are called on the current thread in
   // debug builds.
   base::ThreadChecker thread_checker_;
 
   PipelineMetadata pipeline_metadata_;
 
   base::WeakPtrFactory<RemotingRendererController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemotingRendererController);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_REMOTING_REMOTING_RENDERER_CONTROLLER_H_