Add SourceBuffer implementations of Audio/VideoTracks

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 209 matching lines @@
     // 6. If the mode attribute equals "sequence", then set the group start timestamp to new timestamp offset.
     if (!m_webSourceBuffer->setTimestampOffset(offset)) {
         MediaSource::logAndThrowDOMException(exceptionState, InvalidStateError, "The timestamp offset may not be set while the SourceBuffer's append state is 'PARSING_MEDIA_SEGMENT'.");
         return;
     }
 
     // 7. Update the attribute to new timestamp offset.
     m_timestampOffset = offset;
 }
 
+AudioTrackList& SourceBuffer::audioTracks()
+{
+    ASSERT(RuntimeEnabledFeatures::audioVideoTracksEnabled());
+    return *m_audioTracks;
+}
+
+VideoTrackList& SourceBuffer::videoTracks()
+{
+    ASSERT(RuntimeEnabledFeatures::audioVideoTracksEnabled());
+    return *m_videoTracks;
+}
+
 double SourceBuffer::appendWindowStart() const
 {
     return m_appendWindowStart;
 }
 
 void SourceBuffer::setAppendWindowStart(double start, ExceptionState& exceptionState)
 {
     WTF_LOG(Media, "SourceBuffer::setAppendWindowStart %p start=%f", this, start);
     // Section 3.1 appendWindowStart attribute setter steps.
     // https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-SourceBuffer-appendWindowStart
@@ skipping 619 matching lines @@
     // m_loader might be already released, in case appendStream has failed due
     // to evictCodedFrames failing in didReceiveDataForClient. In that case
     // appendStreamDone will be invoked from there, no need to repeat it here.
     if (m_loader)
         appendStreamDone(false);
 }
 
 DEFINE_TRACE(SourceBuffer)
 {
     visitor->trace(m_source);
+    visitor->trace(m_audioTracks);
+    visitor->trace(m_videoTracks);
     visitor->trace(m_trackDefaults);
     visitor->trace(m_asyncEventQueue);
     visitor->trace(m_appendBufferAsyncPartRunner);
     visitor->trace(m_removeAsyncPartRunner);
     visitor->trace(m_appendStreamAsyncPartRunner);
     visitor->trace(m_stream);
     RefCountedGarbageCollectedEventTargetWithInlineData<SourceBuffer>::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink