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

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 ba9512fd61b9aa3bcbb5e561b5196d2812478a0c..a3775d19615330fd18f0183819554475d1c94007 100644
--- a/third_party/WebKit/Source/modules/mediasource/SourceBuffer.h
+++ b/third_party/WebKit/Source/modules/mediasource/SourceBuffer.h
@@ -51,6 +51,7 @@ class GenericEventQueue;
 class MediaSource;
 class Stream;
 class TimeRanges;
+class TrackBase;
 class WebSourceBuffer;
 
 class SourceBuffer final
@@ -102,7 +103,8 @@ public:
     const AtomicString& interfaceName() const override;
 
     // WebSourceBufferClient interface
-    void initializationSegmentReceived() override;
+    WebMediaPlayer::TrackId createMediaTrack(WebMediaPlayer::TrackType, WebString, WebString, WebString, WebString) override;
+    void initializationSegmentReceived(const WebVector<WebMediaPlayer::TrackId>&) override;
 
     // Oilpan: eagerly release owned m_webSourceBuffer
     EAGERLY_FINALIZE();
@@ -138,6 +140,15 @@ private:
     Member<TrackDefaultList> m_trackDefaults;
     RawPtrWillBeMember<GenericEventQueue> m_asyncEventQueue;
 
+    // The |m_pendingTracks| collection holds media track objects returned by
+    // createMediaTrack method but not yet reported to the
+    // initializationSegmentReceived. This is necessary to prevent media track
+    // objects from being GC-collected before the init segment algorithm is run.
+    HeapVector<Member<TrackBase>> m_pendingTracks;
+
+    HeapVector<WebMediaPlayer::TrackId> m_audioTrackIds;

[wolenetz, 2016/03/23 19:34:13]

nit: are these going to be used for anything in this CL? If not, but about to be
used in next in chain of CLs, that's fine with me for now. If not really going
to be used soon, please remove.

[servolk, 2016/03/24 01:31:56]

These are used for implementing a primitive 'init segment received' algorithm,
which is necessary to ensure we don't break any tests or existing functionality.

[wolenetz, 2016/03/24 01:57:43]

Acknowledged.

+    HeapVector<WebMediaPlayer::TrackId> m_videoTrackIds;
+

[wolenetz, 2016/03/23 19:34:13]

nit: add TODO for textTracks?

[servolk, 2016/03/24 01:31:56]

Done.

     AtomicString m_mode;
     bool m_updating;
     double m_timestampOffset;