ServiceWorker: coalesce all SWClientInfo request into one task.

content/browser/service_worker/service_worker_provider_host.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 137 matching lines @@
       const std::vector<TransferredMessagePort>& sent_message_ports);
 
   // Activates the WebContents associated with
   // { render_process_id_, render_frame_id_ }.
   // Runs the |callback| with the updated ServiceWorkerClientInfo in parameter.
   void Focus(const GetClientInfoCallback& callback);
 
   // Asks the renderer to send back the document information.
   void GetClientInfo(const GetClientInfoCallback& callback) const;
 
+  // Same as above but has to be called from the UI thread.
+  // It is taking the process and frame ids in parameter because |this| is meant
+  // to live on the IO thread.
+  static ServiceWorkerClientInfo GetClientInfoOnUI(int render_process_id,
+                                                   int render_frame_id);
+
   // Adds reference of this host's process to the |pattern|, the reference will
   // be removed in destructor.
   void AddScopedProcessReferenceToPattern(const GURL& pattern);
 
   // |registration| claims the document to be controlled.
   void ClaimedByRegistration(ServiceWorkerRegistration* registration);
 
   // Methods to support cross site navigations.
   void PrepareForCrossSiteTransfer();
   void CompleteCrossSiteTransfer(
@@ skipping 67 matching lines @@
   bool is_claiming_;
 
   std::vector<base::Closure> queued_events_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerProviderHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_