[Media] Add a feature flag to pause bg video only players.

media/blink/webmediaplayer_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/blink/webmediaplayer_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <string>
@@ skipping 112 matching lines @@
 }
 
 bool IsResumeBackgroundVideosEnabled() {
   return base::FeatureList::IsEnabled(kResumeBackgroundVideo);
 }
 
 bool IsBackgroundVideoTrackOptimizationEnabled() {
   return base::FeatureList::IsEnabled(kBackgroundVideoTrackOptimization);
 }
 
+bool IsBackgroundVideoPauseOptimizationEnabled() {
+  return base::FeatureList::IsEnabled(kBackgroundVideoPauseOptimization);
+}
+
 bool IsNetworkStateError(blink::WebMediaPlayer::NetworkState state) {
   bool result = state == blink::WebMediaPlayer::kNetworkStateFormatError ||
                 state == blink::WebMediaPlayer::kNetworkStateNetworkError ||
                 state == blink::WebMediaPlayer::kNetworkStateDecodeError;
   DCHECK_EQ(state > blink::WebMediaPlayer::kNetworkStateLoaded, result);
   return result;
 }
 
 gfx::Size GetRotatedVideoSize(VideoRotation rotation, gfx::Size natural_size) {
   if (rotation == VIDEO_ROTATION_90 || rotation == VIDEO_ROTATION_270)
@@ skipping 2051 matching lines @@
     if (IsRemote())
       return false;
 #endif
 
     return !HasAudio() || (IsResumeBackgroundVideosEnabled() &&
                            video_locked_when_paused_when_hidden_);
   }
 
   // Otherwise only pause if the optimization is on and it's a video-only
   // optimization candidate.
-  return IsBackgroundVideoTrackOptimizationEnabled() && !HasAudio() &&
+  return IsBackgroundVideoPauseOptimizationEnabled() && !HasAudio() &&
          IsBackgroundOptimizationCandidate();
 }
 
 bool WebMediaPlayerImpl::ShouldDisableVideoWhenHidden() const {
   // This optimization is behind the flag on all platforms.
   if (!IsBackgroundVideoTrackOptimizationEnabled())
     return false;
 
   // Disable video track only for players with audio that match the criteria for
   // being optimized.
@@ skipping 132 matching lines @@
 
 void WebMediaPlayerImpl::RecordUnderflowDuration(base::TimeDelta duration) {
   DCHECK(data_source_ || chunk_demuxer_);
   if (data_source_)
     UMA_HISTOGRAM_TIMES("Media.UnderflowDuration", duration);
   else
     UMA_HISTOGRAM_TIMES("Media.UnderflowDuration.MSE", duration);
 }
 
 }  // namespace media