Pass MSE media track info from ChunkDemuxer to blink::SourceBuffer

third_party/WebKit/public/platform/WebSourceBufferClient.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebSourceBufferClient_h
 #define WebSourceBufferClient_h
 
+#include "WebMediaPlayer.h"
+#include "WebString.h"
+#include "WebVector.h"
+
 namespace blink {
 
 class WebSourceBufferClient {
 public:
     virtual ~WebSourceBufferClient() { }
 
-    // FIXME: Add a track collection parameter here.
-    virtual void initializationSegmentReceived() = 0;
+    // Creates a new media track of a given type with given properties (id, kind, label, language) for this SourceBuffer and
+    // places it into a collection of pending SB tracks. This notifies SourceBuffer to expect the newly created track to be
+    // used in a new init segment. This function returns a unique blink media track id, which is used to identify media track
+    // in WebMediaPlayer::enabledAudioTracksChanged and WebMediaPlayer::selectedVideoTrackChanged.
+    virtual WebMediaPlayer::TrackId createMediaTrack(WebMediaPlayer::TrackType, WebString, WebString, WebString, WebString) = 0;
+
+    // Notifies SourceBuffer that parsing of a new init segment has been completed successfully. The media tracks encountered
+    // in the new init segment has been created via createMediaTrack above. The input parameter is a vector of TrackIds
+    // specifying media track order in the init segment.
+    virtual void initializationSegmentReceived(const WebVector<WebMediaPlayer::TrackId>&) = 0;
 };
 
 } // namespace blink
 
 #endif // WebSourceBufferClient_h