Disable background video track behind a feature flag

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 2540 matching lines @@
 }
 
 void HTMLMediaElement::togglePlayState() {
   if (paused())
     play();
   else
     pause();
 }
 
 AudioTrackList& HTMLMediaElement::audioTracks() {
-  DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
   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());
 
   audioTracks().scheduleChangeEvent();
@@ skipping 21 matching lines @@
     WebMediaPlayerClient::AudioTrackKind kind,
     const WebString& label,
     const WebString& language,
     bool enabled) {
   AtomicString kindString = AudioKindToString(kind);
   BLINK_MEDIA_LOG << "addAudioTrack(" << (void*)this << ", '" << (String)id
                   << "', ' " << (AtomicString)kindString << "', '"
                   << (String)label << "', '" << (String)language << "', "
                   << boolString(enabled) << ")";
 
-  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-    return blink::WebMediaPlayer::TrackId();
-
   AudioTrack* audioTrack =
       AudioTrack::create(id, kindString, label, language, enabled);
   audioTracks().add(audioTrack);
 
   return audioTrack->id();
 }
 
 void HTMLMediaElement::removeAudioTrack(WebMediaPlayer::TrackId trackId) {
   BLINK_MEDIA_LOG << "removeAudioTrack(" << (void*)this << ")";
 
-  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-    return;
-
   audioTracks().remove(trackId);
 }
 
 VideoTrackList& HTMLMediaElement::videoTracks() {
-  DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
   return *m_videoTracks;
 }
 
 void HTMLMediaElement::selectedVideoTrackChanged(VideoTrack* track) {
   BLINK_MEDIA_LOG << "selectedVideoTrackChanged(" << (void*)this
                   << ") selectedTrackId="
                   << (track->selected() ? String(track->id()) : "none");
   DCHECK(RuntimeEnabledFeatures::audioVideoTracksEnabled());
 
   if (track->selected())
@@ skipping 14 matching lines @@
     WebMediaPlayerClient::VideoTrackKind kind,
     const WebString& label,
     const WebString& language,
     bool selected) {
   AtomicString kindString = VideoKindToString(kind);
   BLINK_MEDIA_LOG << "addVideoTrack(" << (void*)this << ", '" << (String)id
                   << "', '" << (AtomicString)kindString << "', '"
                   << (String)label << "', '" << (String)language << "', "
                   << boolString(selected) << ")";
 
-  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-    return blink::WebMediaPlayer::TrackId();
-
   // If another track was selected (potentially by the user), leave it selected.
   if (selected && videoTracks().selectedIndex() != -1)
     selected = false;
 
   VideoTrack* videoTrack =
       VideoTrack::create(id, kindString, label, language, selected);
   videoTracks().add(videoTrack);
 
   return videoTrack->id();
 }
 
 void HTMLMediaElement::removeVideoTrack(WebMediaPlayer::TrackId trackId) {
   BLINK_MEDIA_LOG << "removeVideoTrack(" << (void*)this << ")";
 
-  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
-    return;
-
   videoTracks().remove(trackId);
 }
 
 void HTMLMediaElement::addTextTrack(WebInbandTextTrack* webTrack) {
   // 4.8.10.12.2 Sourcing in-band text tracks
   // 1. Associate the relevant data with a new text track and its corresponding
   // new TextTrack object.
   InbandTextTrack* textTrack = InbandTextTrack::create(webTrack);
 
   // 2. Set the new text track's kind, label, and language based on the
@@ skipping 510 matching lines @@
 void HTMLMediaElement::cancelledRemotePlaybackRequest() {
   if (remotePlaybackClient())
     remotePlaybackClient()->promptCancelled();
 }
 
 void HTMLMediaElement::remotePlaybackStarted() {
   if (remotePlaybackClient())
     remotePlaybackClient()->stateChanged(WebRemotePlaybackState::Connected);
 }
 
+bool HTMLMediaElement::hasSelectedVideoTrack() {
+  DCHECK(RuntimeEnabledFeatures::backgroundVideoTrackOptimizationEnabled());
+
+  return m_videoTracks && m_videoTracks->selectedIndex() != -1;
+}
+
+WebMediaPlayer::TrackId HTMLMediaElement::getSelectedVideoTrackId() {
+  DCHECK(RuntimeEnabledFeatures::backgroundVideoTrackOptimizationEnabled());
+  DCHECK(hasSelectedVideoTrack());
+
+  int selectedTrackIndex = m_videoTracks->selectedIndex();
+  VideoTrack* track = m_videoTracks->anonymousIndexedGetter(selectedTrackIndex);
+  return track->id();
+}
+
 bool HTMLMediaElement::isAutoplayingMuted() {
   if (!isHTMLVideoElement() ||
       !RuntimeEnabledFeatures::autoplayMutedVideosEnabled()) {
     return false;
   }
 
   return !paused() && muted() && isLockedPendingUserGesture();
 }
 
 void HTMLMediaElement::requestReload(const WebURL& newUrl) {
@@ skipping 634 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())
+  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled() &&
+      !RuntimeEnabledFeatures::backgroundVideoTrackOptimizationEnabled()) {
     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())
     addAudioTrack("audio", WebMediaPlayerClient::AudioTrackKindMain,
                   "Audio Track", "", true);
 
   // Create a placeholder video track if the player says it has video but it
   // didn't explicitly announce the tracks.
   if (hasVideo() && !videoTracks().length())
     addVideoTrack("video", WebMediaPlayerClient::VideoTrackKindMain,
                   "Video Track", "", true);
 }
 
 void HTMLMediaElement::selectInitialTracksIfNecessary() {
-  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled())
+  if (!RuntimeEnabledFeatures::audioVideoTracksEnabled() &&
+      !RuntimeEnabledFeatures::backgroundVideoTrackOptimizationEnabled()) {
     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