From: AlexeyBarabash <alexey@brave.com>
Date: Thu, 2 Nov 2017 18:21:16 +0200
Subject: Allow playing audio in background

---
 .../public/platform/media/web_media_player_impl.h    |  3 +++
 .../renderer/platform/media/web_media_player_impl.cc | 12 +++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/third_party/blink/public/platform/media/web_media_player_impl.h b/third_party/blink/public/platform/media/web_media_player_impl.h
--- a/third_party/blink/public/platform/media/web_media_player_impl.h
+++ b/third_party/blink/public/platform/media/web_media_player_impl.h
@@ -159,6 +159,9 @@ class BLINK_PLATFORM_EXPORT WebMediaPlayerImpl
   bool HasVideo() const override;
   bool HasAudio() const override;
 
+  // True is has video and it's frame size is not zero
+  bool HasVideoNonEmptySize() const;
+
   void EnabledAudioTracksChanged(
       const WebVector<WebMediaPlayer::TrackId>& enabledTrackIds) override;
   void SelectedVideoTrackChanged(
diff --git a/third_party/blink/renderer/platform/media/web_media_player_impl.cc b/third_party/blink/renderer/platform/media/web_media_player_impl.cc
--- a/third_party/blink/renderer/platform/media/web_media_player_impl.cc
+++ b/third_party/blink/renderer/platform/media/web_media_player_impl.cc
@@ -1118,6 +1118,12 @@ bool WebMediaPlayerImpl::HasAudio() const {
   return pipeline_metadata_.has_audio;
 }
 
+bool WebMediaPlayerImpl::HasVideoNonEmptySize() const {
+  DCHECK(main_task_runner_->BelongsToCurrentThread());
+
+  return pipeline_metadata_.has_video && pipeline_metadata_.natural_size.width() != 0 && pipeline_metadata_.natural_size.height() != 0;
+}
+
 void WebMediaPlayerImpl::EnabledAudioTracksChanged(
     const WebVector<WebMediaPlayer::TrackId>& enabledTrackIds) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
@@ -3490,7 +3496,11 @@ bool WebMediaPlayerImpl::ShouldPausePlaybackWhenHidden() const {
   // Audio only stream is allowed to play when in background.
   // TODO: We should check IsBackgroundOptimizationCandidate here. But we need
   // to move the logic of checking video frames out of that function.
-  if (!HasVideo())
+
+  //pipeline_metadata_.has_video is true for MediaPlayerRenderer,
+  //see media/base/pipeline_metadata.h. This is a workaround to allow audio
+  //streams be played in background.
+  if (!HasVideoNonEmptySize())
     return false;
 
   if (using_media_player_renderer_ &&
-- 
2.17.1