Propagate audible state from player to the containing tab

media/base/android/media_player_android.cc

Index: media/base/android/media_player_android.cc
diff --git a/media/base/android/media_player_android.cc b/media/base/android/media_player_android.cc
index 954ba96c70d2f67d487daa923774e10d112ffe8b..92f6c53776f4ce4748906b8f91d4b2fed8f5b618 100644
--- a/media/base/android/media_player_android.cc
+++ b/media/base/android/media_player_android.cc
@@ -79,5 +79,9 @@ void MediaPlayerAndroid::DetachListener() {
   listener_->ReleaseMediaPlayerListenerResources();
 }
 
+void MediaPlayerAndroid::SetAudible(bool is_audible) {
+  manager_->OnAudibleStateChanged(player_id(), is_audible);

[qinmin, 2015/02/03 20:33:24]

For each SetAudible() call, the AudioMonitorAndroid needs to loop through all
the players and check if the tab is audible. 
it is very inefficient if we handing off all the calls to it.
We can simply do a check here to see if audible state changes before we pass the
call to the manager.

[Tima Vaisburd, 2015/02/03 23:53:05]

Added another |bool is_audible_;| to MediaPlayerAndroid.
Maybe it would be also OK to modify 
AudioMonitorAndroid::OnAudibleStateChanged() like

{
  bool old_state = audio_status_map_[Key(rfh, player_id)];
  if (is_audible != old_state) { ... }
}
to keep the logic in one place?

+}
+
 
 }  // namespace media