Tuning WebRTC audio focus type

content/browser/media/session/media_session.cc

 // Copyright 2015 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 "content/browser/media/session/media_session.h"
 
 #include "content/browser/media/session/audio_focus_delegate.h"
 #include "content/browser/media/session/media_session_player_observer.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 63 matching lines @@
 
 void MediaSession::SetMetadata(const base::Optional<MediaMetadata>& metadata) {
   metadata_ = metadata;
   static_cast<WebContentsImpl*>(web_contents())
       ->OnMediaSessionMetadataChanged();
 }
 
 bool MediaSession::AddPlayer(MediaSessionPlayerObserver* observer,
                              int player_id,
                              media::MediaContentType media_content_type) {
+  if (media_content_type == media::MediaContentType::Uncontrollable)
+    return true;
   if (media_content_type == media::MediaContentType::Pepper)
     return AddPepperPlayer(observer, player_id);
 
   observer->OnSetVolumeMultiplier(player_id, GetVolumeMultiplier());
 
   // Determine the audio focus type required for playing the new player.
   // TODO(zqzhang): handle duckable and uncontrollable.
   // See https://crbug.com/639277.
   AudioFocusManager::AudioFocusType required_audio_focus_type;
   if (media_content_type == media::MediaContentType::Persistent) {
@@ skipping 342 matching lines @@
   DCHECK(success);
 
   pepper_players_.insert(PlayerIdentifier(observer, player_id));
 
   observer->OnSetVolumeMultiplier(player_id, GetVolumeMultiplier());
 
   return true;
 }
 
 }  // namespace content