Media Remoting: Switch to remoting only when media is playing.

media/base/media_observer.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_BASE_MEDIA_OBSERVER_H_
 #define MEDIA_BASE_MEDIA_OBSERVER_H_
 
 #include "media/base/cdm_context.h"
 #include "media/base/pipeline_metadata.h"
 
@@ skipping 18 matching lines @@
   virtual void OnSetCdm(CdmContext* cdm_context) = 0;
 
   // Called after demuxer is initialized.
   virtual void OnMetadataChanged(const PipelineMetadata& metadata) = 0;
 
   // Called to indicate whether the site requests that remote playback be
   // disabled. The "disabled" naming corresponds with the
   // "disableRemotePlayback" media element attribute, as described in the
   // Remote Playback API spec: https://w3c.github.io/remote-playback
   virtual void OnRemotePlaybackDisabled(bool disabled) = 0;
+
+  // Called when the media is playing/paused.
+  virtual void OnPlaying() = 0;
+  virtual void OnPaused() = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_OBSERVER_H_