Hook up loading signal to 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 45fbaa52338685b1279aa8a74aeda426c264217a..1603c280735a9b77b36f06393c672f43d05632af 100644
--- a/content/browser/loader/resource_dispatcher_host_impl.h
+++ b/content/browser/loader/resource_dispatcher_host_impl.h
@@ -169,6 +169,11 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   // Called when a RenderViewHost is deleted.
   void OnRenderViewHostDeleted(int child_id, int route_id);
 
+  // Called when a RenderViewHost starts or stops loading.
+  void OnRenderViewHostSetIsLoading(int child_id,
+                                    int route_id,
+                                    bool is_loading);
+
   // Called when a RenderViewHost is hidden.
   void OnRenderViewHostWasHidden(int child_id, int route_id);