Implement one-shot audio focus inside MediaSession

content/renderer/media/webmediaplayer_ms.cc

Index: content/renderer/media/webmediaplayer_ms.cc
diff --git a/content/renderer/media/webmediaplayer_ms.cc b/content/renderer/media/webmediaplayer_ms.cc
index c8b28aaff1e5f06549949902a3d67ae2d1a340fc..dc8d4ba7584459ce84806de45345163a157bb3bc 100644
--- a/content/renderer/media/webmediaplayer_ms.cc
+++ b/content/renderer/media/webmediaplayer_ms.cc
@@ -181,11 +181,11 @@ void WebMediaPlayerMS::play() {
     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;