Add audio signal to the ResourceScheduler.

content/browser/loader/resource_dispatcher_host_impl.h

Index: content/browser/loader/resource_dispatcher_host_impl.h
diff --git a/content/browser/loader/resource_dispatcher_host_impl.h b/content/browser/loader/resource_dispatcher_host_impl.h
index 48d975520e28b9e28efb987dfe47bf9519c6f080..16c95efacf8ca186cb1b6c4f349c7db4f428de2d 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -164,7 +164,10 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   }
 
   // Called when a RenderViewHost is created.
-  void OnRenderViewHostCreated(int child_id, int route_id, bool is_visible);
+  void OnRenderViewHostCreated(int child_id,
+                               int route_id,
+                               bool is_visible,
+                               bool is_audible);
 
   // Called when a RenderViewHost is deleted.
   void OnRenderViewHostDeleted(int child_id, int route_id);
@@ -180,6 +183,11 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   // Called when a RenderViewHost is shown.
   void OnRenderViewHostWasShown(int child_id, int route_id);
 
+  // Called when an AudioRenderHost starts or stops playing.
+  void OnAudioRenderHostStreamStateChanged(int child_id,
+                                           int route_id,
+                                           bool is_playing);
+
   // Force cancels any pending requests for the given process.
   void CancelRequestsForProcess(int child_id);