Mark HTMLMediaElement media tracks functionality as stable

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 225 matching lines @@
         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()
 {
-    DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
     return *m_audioTracks;
 }
 
 VideoTrackList& SourceBuffer::videoTracks()
 {
-    DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
     return *m_videoTracks;
 }
 
 double SourceBuffer::appendWindowStart() const
 {
     return m_appendWindowStart;
 }
 
 void SourceBuffer::setAppendWindowStart(double start, ExceptionState& exceptionState)
 {
@@ skipping 252 matching lines @@
     if (isRemoved())
         return;
 
     BLINK_SBLOG << __func__ << " this=" << this;
     if (m_pendingRemoveStart != -1) {
         cancelRemove();
     } else {
         abortIfUpdating();
     }
 
-    if (RuntimeEnabledFeatures::audioVideoTracksEnabled()) {
-        DCHECK(m_source);
-        if (m_source->mediaElement()->audioTracks().length() > 0
-            || m_source->mediaElement()->videoTracks().length() > 0) {
-            removeMediaTracks();
-        }
+    DCHECK(m_source);
+    if (m_source->mediaElement()->audioTracks().length() > 0
+        || m_source->mediaElement()->videoTracks().length() > 0) {
+        removeMediaTracks();
     }
 
     m_webSourceBuffer->removedFromMediaSource();
     m_webSourceBuffer.reset();
     m_source = nullptr;
     m_asyncEventQueue = nullptr;
 }
 
 double SourceBuffer::highestPresentationTimestamp()
 {
     DCHECK(!isRemoved());
 
     double pts = m_webSourceBuffer->highestPresentationTimestamp();
     BLINK_SBLOG << __func__ << " this=" << this << ", pts=" << pts;
     return pts;
 }
 
 void SourceBuffer::removeMediaTracks()
 {
-    DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
     // Spec: http://w3c.github.io/media-source/#widl-MediaSource-removeSourceBuffer-void-SourceBuffer-sourceBuffer
     DCHECK(m_source);
 
     HTMLMediaElement* mediaElement = m_source->mediaElement();
     DCHECK(mediaElement);
     // 3. Let SourceBuffer audioTracks list equal the AudioTrackList object returned by sourceBuffer.audioTracks.
     // 4. If the SourceBuffer audioTracks list is not empty, then run the following steps:
     // 4.1 Let HTMLMediaElement audioTracks list equal the AudioTrackList object returned by the audioTracks attribute on the HTMLMediaElement.
     // 4.2 Let the removed enabled audio track flag equal false.
     bool removedEnabledAudioTrack = false;
@@ skipping 99 matching lines @@
     return trackDefault ? AtomicString(trackDefault->language()) : "";
 }
 
 bool SourceBuffer::initializationSegmentReceived(const WebVector<MediaTrackInfo>& newTracks)
 {
     BLINK_SBLOG << __func__ << " this=" << this << " tracks=" << newTracks.size();
     DCHECK(m_source);
     DCHECK(m_source->mediaElement());
     DCHECK(m_updating);
 
-    if (!RuntimeEnabledFeatures::audioVideoTracksEnabled()) {
-        if (!m_firstInitializationSegmentReceived) {
-            m_source->setSourceBufferActive(this);
-            m_firstInitializationSegmentReceived = true;
-        }
-        return true;
-    }
-
     // Implementation of Initialization Segment Received, see
     // https://w3c.github.io/media-source/#sourcebuffer-init-segment-received
 
     // Sort newTracks into audio and video tracks to facilitate implementation
     // of subsequent steps of this algorithm.
     Vector<MediaTrackInfo> newAudioTracks;
     Vector<MediaTrackInfo> newVideoTracks;
     for (const MediaTrackInfo& trackInfo : newTracks) {
         const TrackBase* track = nullptr;
         if (trackInfo.trackType == WebMediaPlayer::AudioTrack) {
@@ skipping 572 matching lines @@
     visitor->trace(m_removeAsyncPartRunner);
     visitor->trace(m_appendStreamAsyncPartRunner);
     visitor->trace(m_stream);
     visitor->trace(m_audioTracks);
     visitor->trace(m_videoTracks);
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink