Implement MediaStreamTrack contentHint skeleton.

third_party/WebKit/Source/platform/mediastream/MediaStreamCenter.cpp

 /*
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 98 matching lines @@
     WebMediaStream webStream(stream);
     m_private->didCreateMediaStream(webStream);
   }
 }
 
 void MediaStreamCenter::didCreateMediaStreamTrack(MediaStreamComponent* track) {
   if (m_private)
     m_private->didCreateMediaStreamTrack(track);
 }
 
+void MediaStreamCenter::didSetContentHint(MediaStreamComponent* track) {
+  if (m_private)
+    m_private->didSetContentHint(track);
+}
+
 std::unique_ptr<AudioSourceProvider>
 MediaStreamCenter::createWebAudioSourceFromMediaStreamTrack(
     MediaStreamComponent* track) {
   DCHECK(track);
   if (m_private) {
     return MediaStreamWebAudioSource::create(WTF::wrapUnique(
         m_private->createWebAudioSourceFromMediaStreamTrack(track)));
   }
 
   return nullptr;
 }
 
 void MediaStreamCenter::stopLocalMediaStream(const WebMediaStream& webStream) {
   MediaStreamDescriptor* stream = webStream;
   MediaStreamDescriptorClient* client = stream->client();
   if (client)
     client->streamEnded();
 }
 
 }  // namespace blink