Add audio signal to the ResourceScheduler.

content/browser/loader/resource_dispatcher_host_impl.cc

Index: content/browser/loader/resource_dispatcher_host_impl.cc
diff --git a/content/browser/loader/resource_dispatcher_host_impl.cc b/content/browser/loader/resource_dispatcher_host_impl.cc
index ebfce6cdca9ef6cb37e6bf14c1dbb9cd11968d4f..548391b5aadb5bcf9280442438f15c40c9be7167 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.cc
+++ b/content/browser/loader/resource_dispatcher_host_impl.cc
@@ -1382,6 +1382,13 @@ void ResourceDispatcherHostImpl::OnRenderViewHostWasShown(
   scheduler_->OnVisibilityChanged(child_id, route_id, true);
 }
 
+void ResourceDispatcherHostImpl::OnAudioRenderHostStreamStateChanged(
+    int child_id,
+    int route_id,
+    bool is_playing) {
+  scheduler_->OnAudibilityChanged(child_id, route_id, is_playing);
+}
+
 // This function is only used for saving feature.
 void ResourceDispatcherHostImpl::BeginSaveFile(
     const GURL& url,