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

Source/web/WebMediaPlayerClientImpl.cpp

Index: Source/web/WebMediaPlayerClientImpl.cpp
diff --git a/Source/web/WebMediaPlayerClientImpl.cpp b/Source/web/WebMediaPlayerClientImpl.cpp
index 04e95748bf0eb4ba3c46d4c6da577f8748909c16..779d1ff4f14d5e4320a697fe87494d80f08e9b14 100644
--- a/Source/web/WebMediaPlayerClientImpl.cpp
+++ b/Source/web/WebMediaPlayerClientImpl.cpp
@@ -151,6 +151,26 @@ void WebMediaPlayerClientImpl::setWebLayer(blink::WebLayer* layer)
     m_client->mediaPlayerSetWebLayer(layer);
 }
 
+void WebMediaPlayerClientImpl::addVideoTrack(const WebString& id, VideoTrackKind kind, const WebString& label, const WebString& language, bool selected)
+{
+    mediaElement().addVideoTrack(id, kind, label, language, selected);
+}
+
+void WebMediaPlayerClientImpl::removeVideoTrack(const WebString& id)
+{
+    mediaElement().removeVideoTrack(id);
+}
+
+void WebMediaPlayerClientImpl::addAudioTrack(const WebString& id, AudioTrackKind kind, const WebString& label, const WebString& language, bool enabled)
+{
+    mediaElement().addAudioTrack(id, kind, label, language, enabled);
+}
+
+void WebMediaPlayerClientImpl::removeAudioTrack(const WebString& id)
+{
+    mediaElement().removeAudioTrack(id);
+}
+
 void WebMediaPlayerClientImpl::addTextTrack(WebInbandTextTrack* textTrack)
 {
     m_client->mediaPlayerDidAddTextTrack(textTrack);