Implement MediaStreamTrack contentHint skeleton.

third_party/WebKit/public/platform/WebMediaStreamTrack.h

 /*
  * 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 42 matching lines @@
     WebString deviceId;
   };
 
   class TrackData {
    public:
     TrackData() {}
     virtual ~TrackData() {}
     virtual void getSettings(Settings&) = 0;
   };
 
+  enum class ContentHintType {
+    None,
+    AudioSpeech,
+    AudioMusic,
+    VideoFluid,
+    VideoDetailed
+  };
+
   WebMediaStreamTrack() {}
   WebMediaStreamTrack(const WebMediaStreamTrack& other) { assign(other); }
   ~WebMediaStreamTrack() { reset(); }
 
   WebMediaStreamTrack& operator=(const WebMediaStreamTrack& other) {
     assign(other);
     return *this;
   }
   BLINK_PLATFORM_EXPORT void assign(const WebMediaStreamTrack&);
 
   BLINK_PLATFORM_EXPORT void initialize(const WebMediaStreamSource&);
   BLINK_PLATFORM_EXPORT void initialize(const WebString& id,
                                         const WebMediaStreamSource&);
 
   BLINK_PLATFORM_EXPORT void reset();
   bool isNull() const { return m_private.isNull(); }
 
   BLINK_PLATFORM_EXPORT WebString id() const;
 
   BLINK_PLATFORM_EXPORT WebMediaStreamSource source() const;
   BLINK_PLATFORM_EXPORT bool isEnabled() const;
   BLINK_PLATFORM_EXPORT bool isMuted() const;
+  BLINK_PLATFORM_EXPORT ContentHintType contentHint() const;
 
   // Extra data associated with this WebMediaStream.
   // If non-null, the extra data pointer will be deleted when the object is
   // destroyed.  Setting the track data pointer will cause any existing non-null
   // track data pointer to be deleted.
   BLINK_PLATFORM_EXPORT TrackData* getTrackData() const;
   BLINK_PLATFORM_EXPORT void setTrackData(TrackData*);
 
   // The lifetime of the WebAudioSourceProvider should outlive the
   // WebMediaStreamTrack, and clients are responsible for calling
   // setSourceProvider(0) before the WebMediaStreamTrack is going away.
   BLINK_PLATFORM_EXPORT void setSourceProvider(WebAudioSourceProvider*);
 
 #if INSIDE_BLINK
   BLINK_PLATFORM_EXPORT WebMediaStreamTrack(MediaStreamComponent*);
   BLINK_PLATFORM_EXPORT WebMediaStreamTrack& operator=(MediaStreamComponent*);
   BLINK_PLATFORM_EXPORT operator WTF::PassRefPtr<MediaStreamComponent>() const;
   BLINK_PLATFORM_EXPORT operator MediaStreamComponent*() const;
 #endif
 
  private:
   WebPrivatePtr<MediaStreamComponent> m_private;
 };
 
 }  // namespace blink
 
 #endif  // WebMediaStreamTrack_h