Initial implementation of AudioTrack, AudioTrackList, VideoTrack, and VideoTrackList.

Source/web/WebMediaPlayerClientImpl.h

Index: Source/web/WebMediaPlayerClientImpl.h
diff --git a/Source/web/WebMediaPlayerClientImpl.h b/Source/web/WebMediaPlayerClientImpl.h
index 91cd9d734feed7ede44fdbf9f56597e2f2b5e971..1dd06d530648513f9c35e65f7cc2f0dfd864882b 100644
--- a/Source/web/WebMediaPlayerClientImpl.h
+++ b/Source/web/WebMediaPlayerClientImpl.h
@@ -68,7 +68,7 @@ public:
     virtual ~WebMediaPlayerClientImpl();
 
     // Returns the encapsulated blink::WebMediaPlayer.
-    WebMediaPlayer* mediaPlayer() const;
+    virtual WebMediaPlayer* webMediaPlayer() const;
 
     // WebMediaPlayerClient methods:
     virtual void networkStateChanged() OVERRIDE;
@@ -89,6 +89,10 @@ public:
     virtual void closeHelperPluginSoon(WebFrame*) OVERRIDE;
     virtual bool needsWebLayerForVideo() const OVERRIDE;
     virtual void setWebLayer(WebLayer*) OVERRIDE;
+    virtual void addVideoTrack(const WebString& id, VideoTrackKind, const WebString& label, const WebString& language, bool selected) OVERRIDE;
+    virtual void removeVideoTrack(const WebString& id) OVERRIDE;
+    virtual void addAudioTrack(const WebString& id, AudioTrackKind, const WebString& label, const WebString& language, bool enabled) OVERRIDE;
+    virtual void removeAudioTrack(const WebString& id) OVERRIDE;
     virtual void addTextTrack(WebInbandTextTrack*) OVERRIDE;
     virtual void removeTextTrack(WebInbandTextTrack*) OVERRIDE;
     virtual void mediaSourceOpened(WebMediaSource*) OVERRIDE;