ServiceWorker: coalesce all SWClientInfo request into one task.

content/browser/service_worker/service_worker_provider_host.h

Index: content/browser/service_worker/service_worker_provider_host.h
diff --git a/content/browser/service_worker/service_worker_provider_host.h b/content/browser/service_worker/service_worker_provider_host.h
index a4f370418c34ae6b2b80f995cb91a03e207cd650..0943e2f38fcd42fdd993ecd9c9dc0456c9eeabe8 100644
--- a/content/browser/service_worker/service_worker_provider_host.h
+++ b/content/browser/service_worker/service_worker_provider_host.h
@@ -155,6 +155,12 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
   // 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);