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

public/platform/WebMediaPlayerClient.h

Index: public/platform/WebMediaPlayerClient.h
diff --git a/public/platform/WebMediaPlayerClient.h b/public/platform/WebMediaPlayerClient.h
index 1f47e1189d51705b1c6ebdb473c5244b9a161c3b..fc7503ffd2f3c0288916ae3dea3575327bc20ea9 100644
--- a/public/platform/WebMediaPlayerClient.h
+++ b/public/platform/WebMediaPlayerClient.h
@@ -54,6 +54,26 @@ public:
         MediaKeyErrorCodeDomain,
     };
 
+    enum VideoTrackKind {
+        VideoTrackKindNone,
+        VideoTrackKindAlternative,
+        VideoTrackKindCaptions,
+        VideoTrackKindMain,
+        VideoTrackKindSign,
+        VideoTrackKindSubtitles,
+        VideoTrackKindCommentary
+    };
+
+    enum AudioTrackKind {
+        AudioTrackKindNone,
+        AudioTrackKindAlternative,
+        AudioTrackKindDescriptions,
+        AudioTrackKindMain,
+        AudioTrackKindMainDescriptions,
+        AudioTrackKindTranslation,
+        AudioTrackKindCommentary
+    };
+
     virtual void networkStateChanged() = 0;
     virtual void readyStateChanged() = 0;
     virtual void timeChanged() = 0;
@@ -74,6 +94,11 @@ public:
     virtual void closeHelperPluginSoon(WebFrame*) = 0;
     virtual bool needsWebLayerForVideo() const = 0;
     virtual void setWebLayer(WebLayer*) = 0;
+
+    virtual void addVideoTrack(const WebString& id, VideoTrackKind, const WebString& label, const WebString& language, bool selected) = 0;
+    virtual void removeVideoTrack(const WebString& id) = 0;
+    virtual void addAudioTrack(const WebString& id, AudioTrackKind, const WebString& label, const WebString& language, bool enabled) = 0;
+    virtual void removeAudioTrack(const WebString& id) = 0;
     virtual void addTextTrack(WebInbandTextTrack*) = 0;
     virtual void removeTextTrack(WebInbandTextTrack*) = 0;
     virtual void mediaSourceOpened(WebMediaSource*) = 0;