Push API: Return cached registration if available.

content/browser/push_messaging/push_messaging_message_filter.h

Index: content/browser/push_messaging/push_messaging_message_filter.h
diff --git a/content/browser/push_messaging/push_messaging_message_filter.h b/content/browser/push_messaging/push_messaging_message_filter.h
index cfb2f6afeb6aef31991017c80f07929ea2d7bc7c..942473968af72e68c9c6b6d52aca4fbf76e1614a 100644
--- a/content/browser/push_messaging/push_messaging_message_filter.h
+++ b/content/browser/push_messaging/push_messaging_message_filter.h
@@ -70,6 +70,15 @@ class PushMessagingMessageFilter : public BrowserMessageFilter {
   void OnGetPermissionStatus(int request_id,
                              int64 service_worker_registration_id);
 
+  void CheckForExistingRegistration(const RegisterData& data,
+                                    const std::string& sender_id);
+
+  void DidCheckForExistingRegistration(
+      const RegisterData& data,
+      const std::string& sender_id,
+      const std::string& push_registration_id,
+      ServiceWorkerStatusCode service_worker_status);
+
   void RegisterOnUI(const RegisterData& data,
                     const std::string& sender_id);
 
@@ -98,8 +107,12 @@ class PushMessagingMessageFilter : public BrowserMessageFilter {
   void SendRegisterError(const RegisterData& data,
                          PushRegistrationStatus status);
   void SendRegisterSuccess(const RegisterData& data,
+                           PushRegistrationStatus status,
                            const GURL& push_endpoint,
                            const std::string& push_registration_id);
+  void SendRegisterSuccessOnUI(const RegisterData& data,
+                               PushRegistrationStatus status,
+                               const std::string& push_registration_id);
 
   // Returns a push messaging service. The embedder owns the service, and is
   // responsible for ensuring that it outlives RenderProcessHost. It's valid to