Implement MediaStreamTrack contentHint skeleton.

third_party/WebKit/Source/platform/exported/WebMediaStreamTrack.cpp

 /*
  * Copyright (C) 2013 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 73 matching lines @@
 bool WebMediaStreamTrack::isEnabled() const {
   ASSERT(!m_private.isNull());
   return m_private->enabled();
 }
 
 bool WebMediaStreamTrack::isMuted() const {
   ASSERT(!m_private.isNull());
   return m_private->muted();
 }
 
+WebMediaStreamTrack::ContentHintType WebMediaStreamTrack::contentHint() const {
+  DCHECK(!m_private.isNull());
+  return m_private->contentHint();
+}
+
 WebString WebMediaStreamTrack::id() const {
   ASSERT(!m_private.isNull());
   return m_private->id();
 }
 
 WebMediaStreamSource WebMediaStreamTrack::source() const {
   ASSERT(!m_private.isNull());
   return WebMediaStreamSource(m_private->source());
 }
 
@@ skipping 14 matching lines @@
 void WebMediaStreamTrack::setSourceProvider(WebAudioSourceProvider* provider) {
   ASSERT(!m_private.isNull());
   m_private->setSourceProvider(provider);
 }
 
 void WebMediaStreamTrack::assign(const WebMediaStreamTrack& other) {
   m_private = other.m_private;
 }
 
 }  // namespace blink