Implement one-shot audio focus inside MediaSession

content/renderer/media/webmediaplayer_ms.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 "content/renderer/media/webmediaplayer_ms.h"
 
 #include <stddef.h>
 #include <limits>
 #include <string>
 #include <utility>
@@ skipping 163 matching lines @@
 
   if (video_frame_provider_)
     video_frame_provider_->Resume();
 
   compositor_->StartRendering();
 
   if (audio_renderer_)
     audio_renderer_->Play();
 
   if (delegate_) {
-    // TODO(perkj, magjed): We use Uncontrollable type here to avoid creating an
-    // interactive media session on Android. See http://crbug.com/596516 for
-    // more details.
+    // TODO(perkj, magjed): We use OneShot focus type here so that it takes
+    // audio focus once it starts, and then will not respond to further audio
+    // focus changes. See http://crbug.com/596516 for more details.
     delegate_->DidPlay(delegate_id_, hasVideo(), hasAudio(), false,
-                       media::MediaContentType::Persistent);
+                       media::MediaContentType::OneShot);
   }
 
   paused_ = false;
 }
 
 void WebMediaPlayerMS::pause() {
   DVLOG(1) << __func__;
   DCHECK(thread_checker_.CalledOnValidThread());
 
   should_play_upon_shown_ = false;
@@ skipping 362 matching lines @@
 void WebMediaPlayerMS::ResetCanvasCache() {
   DCHECK(thread_checker_.CalledOnValidThread());
   video_renderer_.ResetCache();
 }
 
 void WebMediaPlayerMS::TriggerResize() {
   get_client()->sizeChanged();
 }
 
 }  // namespace content