[scheduler] Teach scheduler about audio state

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index ec95918e642f32757c476122ba78261f6e688bcf..2ea898813276ab6c14edd62784bc3f31ce907996 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1278,8 +1278,7 @@ void WebContentsImpl::SetAudioMuted(bool mute) {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     DidUpdateAudioMutingState(mute));
 
-  // Notification for UI updates in response to the changed muting state.
-  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
+  OnAudioStateChanged(!mute && audio_stream_monitor_.IsCurrentlyAudible());
 }
 
 bool WebContentsImpl::IsConnectedToBluetoothDevice() const {
@@ -1339,6 +1338,14 @@ void WebContentsImpl::NotifyNavigationStateChanged(
     GetOuterWebContents()->NotifyNavigationStateChanged(changed_flags);
 }
 
+void WebContentsImpl::OnAudioStateChanged(bool is_audio_playing) {
+  SendPageMessage(
+      new PageMsg_AudioStateChanged(MSG_ROUTING_NONE, is_audio_playing));
+
+  // Notification for UI updates in response to the changed muting state.
+  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
+}
+
 base::TimeTicks WebContentsImpl::GetLastActiveTime() const {
   return last_active_time_;
 }