Add SourceBuffer implementations of Audio/VideoTracks

third_party/WebKit/Source/modules/mediasource/SourceBuffer.h

Index: third_party/WebKit/Source/modules/mediasource/SourceBuffer.h
diff --git a/third_party/WebKit/Source/modules/mediasource/SourceBuffer.h b/third_party/WebKit/Source/modules/mediasource/SourceBuffer.h
index 6bc95ea2bc4d7e4bcb85edbb155d017b0032abba..bb1805817b430a917a7d7b68e37e810df87230d6 100644
--- a/third_party/WebKit/Source/modules/mediasource/SourceBuffer.h
+++ b/third_party/WebKit/Source/modules/mediasource/SourceBuffer.h
@@ -33,6 +33,8 @@
 
 #include "core/dom/ActiveDOMObject.h"
 #include "core/fileapi/FileReaderLoaderClient.h"
+#include "core/html/track/AudioTrackList.h"
+#include "core/html/track/VideoTrackList.h"
 #include "modules/EventTargetModules.h"
 #include "modules/mediasource/TrackDefaultList.h"
 #include "platform/AsyncMethodRunner.h"
@@ -75,6 +77,8 @@ public:
     TimeRanges* buffered(ExceptionState&) const;
     double timestampOffset() const;
     void setTimestampOffset(double, ExceptionState&);
+    AudioTrackList& audioTracks();
+    VideoTrackList& videoTracks();
     void appendBuffer(PassRefPtr<DOMArrayBuffer> data, ExceptionState&);
     void appendBuffer(PassRefPtr<DOMArrayBufferView> data, ExceptionState&);
     void appendStream(Stream*, ExceptionState&);
@@ -145,6 +149,9 @@ private:
     double m_appendWindowEnd;
     bool m_firstInitializationSegmentReceived;
 
+    Member<AudioTrackList> m_audioTracks;
+    Member<VideoTrackList> m_videoTracks;
+
     Vector<unsigned char> m_pendingAppendData;
     size_t m_pendingAppendDataOffset;
     Member<AsyncMethodRunner<SourceBuffer>> m_appendBufferAsyncPartRunner;