[Video] Add dummy video/audio tracks inactive to select them later.

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 381 matching lines @@
   // Keep the same logic as in media_codec_util.h.
   if (url.isNull() || url.isEmpty())
     return false;
 
   if (!url.isLocalFile() && !url.protocolIs("http") && !url.protocolIs("https"))
     return false;
 
   return url.getString().contains("m3u8");
 }
 
+bool HTMLMediaElement::mediaTracksEnabledInternally() {
+  return RuntimeEnabledFeatures::audioVideoTracksEnabled() ||
+         RuntimeEnabledFeatures::backgroundVideoTrackOptimizationEnabled();
+}
+
 HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName,
                                    Document& document)
     : HTMLElement(tagName, document),
       ActiveScriptWrappable(this),
       ActiveDOMObject(&document),
       m_loadTimer(this, &HTMLMediaElement::loadTimerFired),
       m_progressEventTimer(this, &HTMLMediaElement::progressEventTimerFired),
       m_playbackProgressTimer(this,
                               &HTMLMediaElement::playbackProgressTimerFired),
       m_audioTracksTimer(this, &HTMLMediaElement::audioTracksTimerFired),
@@ skipping 2141 matching lines @@
 }
 
 AudioTrackList& HTMLMediaElement::audioTracks() {
   return *m_audioTracks;
 }
 
 void HTMLMediaElement::audioTrackChanged(AudioTrack* track) {
   BLINK_MEDIA_LOG << "audioTrackChanged(" << (void*)this
                   << ") trackId= " << String(track->id())
                   << " enabled=" << boolString(track->enabled());
-  DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
+  DCHECK(mediaTracksEnabledInternally());
 
   audioTracks().scheduleChangeEvent();
 
   if (m_mediaSource)
     m_mediaSource->onTrackChanged(track);
 
   if (!m_audioTracksTimer.isActive())
     m_audioTracksTimer.startOneShot(0, BLINK_FROM_HERE);
 }
 
@@ skipping 34 matching lines @@
 }
 
 VideoTrackList& HTMLMediaElement::videoTracks() {
   return *m_videoTracks;
 }
 
 void HTMLMediaElement::selectedVideoTrackChanged(VideoTrack* track) {
   BLINK_MEDIA_LOG << "selectedVideoTrackChanged(" << (void*)this
                   << ") selectedTrackId="
                   << (track->selected() ? String(track->id()) : "none");
-  DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
+  DCHECK(mediaTracksEnabledInternally());
 
   if (track->selected())
     videoTracks().trackSelected(track->id());
 
   videoTracks().scheduleChangeEvent();
 
   if (m_mediaSource)
     m_mediaSource->onTrackChanged(track);
 
   WebMediaPlayer::TrackId id = track->id();
@@ skipping 1213 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(HTMLMediaElement) {
   visitor->traceWrappers(m_videoTracks);
   visitor->traceWrappers(m_audioTracks);
   visitor->traceWrappers(m_textTracks);
   HTMLElement::traceWrappers(visitor);
 }
 
 void HTMLMediaElement::createPlaceholderTracksIfNecessary() {
-  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled() &&
-      !RuntimeEnabledFeatures::backgroundVideoTrackOptimizationEnabled()) {
+  if (!mediaTracksEnabledInternally())
     return;
-  }
 
   // Create a placeholder audio track if the player says it has audio but it
   // didn't explicitly announce the tracks.
-  if (hasAudio() && !audioTracks().length())
+  if (hasAudio() && !audioTracks().length()) {
     addAudioTrack("audio", WebMediaPlayerClient::AudioTrackKindMain,
-                  "Audio Track", "", true);
+                  "Audio Track", "", false);
+  }
 
   // Create a placeholder video track if the player says it has video but it
   // didn't explicitly announce the tracks.
-  if (hasVideo() && !videoTracks().length())
+  if (hasVideo() && !videoTracks().length()) {
     addVideoTrack("video", WebMediaPlayerClient::VideoTrackKindMain,
-                  "Video Track", "", true);
+                  "Video Track", "", false);
+  }
 }
 
 void HTMLMediaElement::selectInitialTracksIfNecessary() {
-  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled() &&
-      !RuntimeEnabledFeatures::backgroundVideoTrackOptimizationEnabled()) {
+  if (!mediaTracksEnabledInternally())
     return;
-  }
 
   // Enable the first audio track if an audio track hasn't been enabled yet.
   if (audioTracks().length() > 0 && !audioTracks().hasEnabledTrack())
     audioTracks().anonymousIndexedGetter(0)->setEnabled(true);
 
   // Select the first video track if a video track hasn't been selected yet.
   if (videoTracks().length() > 0 && videoTracks().selectedIndex() == -1)
     videoTracks().anonymousIndexedGetter(0)->setSelected(true);
 }
 
@@ skipping 306 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect()
     const {
   IntRect result;
   if (LayoutObject* object = m_element->layoutObject())
     result = object->absoluteBoundingBoxRect();
   return result;
 }
 
 }  // namespace blink