ResourceScheduler get visual signal from RenderViewHostImpl

content/browser/loader/resource_dispatcher_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then forwards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 146 matching lines @@
 
   // The average private bytes increase of the browser for each new pending
   // request. Experimentally obtained.
   static const int kAvgBytesPerOutstandingRequest = 4400;
 
   SaveFileManager* save_file_manager() const {
     return save_file_manager_.get();
   }
 
   // Called when a RenderViewHost is created.
-  void OnRenderViewHostCreated(int child_id, int route_id);
+  void OnRenderViewHostCreated(int child_id, int route_id, bool is_visible);
 
   // Called when a RenderViewHost is deleted.
   void OnRenderViewHostDeleted(int child_id, int route_id);
 
+  // Called when a RenderViewHost is hidden.
+  void OnRenderViewHostWasHidden(int child_id, int route_id);
+
+  // Called when a RenderViewHost is shown.
+  void OnRenderViewHostWasShown(int child_id, int route_id);
+
   // Force cancels any pending requests for the given process.
   void CancelRequestsForProcess(int child_id);
 
   void OnUserGesture(WebContentsImpl* contents);
 
   // Retrieves a net::URLRequest.  Must be called from the IO thread.
   net::URLRequest* GetURLRequest(const GlobalRequestID& request_id);
 
   void RemovePendingRequest(int child_id, int request_id);
 
@@ skipping 334 matching lines @@
   DelegateMap delegate_map_;
 
   scoped_ptr<ResourceScheduler> scheduler_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_