Implement MediaStreamTrack contentHint skeleton.

content/renderer/media/media_stream_center.cc

 // 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.
 
 #include "content/renderer/media/media_stream_center.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 89 matching lines @@
   switch (track.source().getType()) {
     case blink::WebMediaStreamSource::TypeAudio:
       CreateNativeAudioMediaStreamTrack(track);
       break;
     case blink::WebMediaStreamSource::TypeVideo:
       CreateNativeVideoMediaStreamTrack(track);
       break;
   }
 }
 
+void MediaStreamCenter::didSetContentHint(
+    const blink::WebMediaStreamTrack& track) {
+  MediaStreamTrack* native_track =
+      MediaStreamTrack::GetTrack(track);
+  if (native_track)
+    native_track->SetContentHint(track.contentHint());
+}
+
 void MediaStreamCenter::didEnableMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
   MediaStreamTrack* native_track =
       MediaStreamTrack::GetTrack(track);
   if (native_track)
     native_track->SetEnabled(true);
 }
 
 void MediaStreamCenter::didDisableMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
@@ skipping 70 matching lines @@
 
 bool MediaStreamCenter::didRemoveMediaStreamTrack(
     const blink::WebMediaStream& stream,
     const blink::WebMediaStreamTrack& track) {
   DVLOG(1) << "MediaStreamCenter::didRemoveMediaStreamTrack";
   MediaStream* native_stream = MediaStream::GetMediaStream(stream);
   return native_stream->RemoveTrack(track);
 }
 
 }  // namespace content