Implement MediaStreamTrack contentHint skeleton.

third_party/WebKit/Source/platform/mediastream/MediaStreamComponent.h

 /*
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  * 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.
@@ skipping 62 matching lines @@
   // So this class runs pre-finalizer to finalize |m_trackData| promptly.
   void dispose();
 
   MediaStreamSource* source() const { return m_source.get(); }
 
   String id() const { return m_id; }
   bool enabled() const { return m_enabled; }
   void setEnabled(bool enabled) { m_enabled = enabled; }
   bool muted() const { return m_muted; }
   void setMuted(bool muted) { m_muted = muted; }
+  WebMediaStreamTrack::ContentHintType contentHint() { return m_contentHint; }
+  void setContentHint(WebMediaStreamTrack::ContentHintType);
   AudioSourceProvider* getAudioSourceProvider() { return &m_sourceProvider; }
   void setSourceProvider(WebAudioSourceProvider* provider) {
     m_sourceProvider.wrap(provider);
   }
 
   TrackData* getTrackData() const { return m_trackData.get(); }
   void setTrackData(std::unique_ptr<TrackData> trackData) {
     m_trackData = std::move(trackData);
   }
   void getSettings(WebMediaStreamTrack::Settings&);
 
   DECLARE_TRACE();
 
  private:
   MediaStreamComponent(const String& id, MediaStreamSource*);
   MediaStreamComponent(const String& id,
                        MediaStreamSource*,
                        bool enabled,
-                       bool muted);
+                       bool muted,
+                       WebMediaStreamTrack::ContentHintType);
 
   // AudioSourceProviderImpl wraps a WebAudioSourceProvider::provideInput()
   // calls into chromium to get a rendered audio stream.
 
   class PLATFORM_EXPORT AudioSourceProviderImpl final
       : public AudioSourceProvider {
    public:
     AudioSourceProviderImpl() : m_webAudioSourceProvider(0) {}
 
     ~AudioSourceProviderImpl() override {}
 
     // Wraps the given blink::WebAudioSourceProvider to
     // blink::AudioSourceProvider.
     void wrap(WebAudioSourceProvider*);
 
     // blink::AudioSourceProvider
     void provideInput(AudioBus*, size_t framesToProcess) override;
 
    private:
     WebAudioSourceProvider* m_webAudioSourceProvider;
     Mutex m_provideInputLock;
   };
 
   AudioSourceProviderImpl m_sourceProvider;
   Member<MediaStreamSource> m_source;
   String m_id;
   bool m_enabled;
   bool m_muted;
+  WebMediaStreamTrack::ContentHintType m_contentHint;
   std::unique_ptr<TrackData> m_trackData;
 };
 
 typedef HeapVector<Member<MediaStreamComponent>> MediaStreamComponentVector;
 
 }  // namespace blink
 
 #endif  // MediaStreamComponent_h