Implement MediaStreamTrack contentHint skeleton.

content/renderer/media/media_stream_center.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CENTER_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CENTER_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
@@ skipping 18 matching lines @@
   // TODO(miu): Remove these constructor args. They are no longer used.
   // http://crbug.com/577874
   MediaStreamCenter(blink::WebMediaStreamCenterClient* client,
                     PeerConnectionDependencyFactory* factory);
   ~MediaStreamCenter() override;
 
  private:
   void didCreateMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
 
+  void didSetContentHint(const blink::WebMediaStreamTrack& track) override;
+
   void didEnableMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
 
   void didDisableMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
 
   void didStopLocalMediaStream(const blink::WebMediaStream& stream) override;
 
   bool didStopMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
 
   blink::WebAudioSourceProvider* createWebAudioSourceFromMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
 
   void didCreateMediaStream(blink::WebMediaStream& stream) override;
 
   bool didAddMediaStreamTrack(const blink::WebMediaStream& stream,
                               const blink::WebMediaStreamTrack& track) override;
 
   bool didRemoveMediaStreamTrack(
       const blink::WebMediaStream& stream,
       const blink::WebMediaStreamTrack& track) override;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamCenter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CENTER_H_