Change RunAfterStartWorker to not start the worker if it is already running.

content/browser/service_worker/service_worker_version.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_VERSION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 160 matching lines @@
 
   // If an update is scheduled but not yet started, this resets the timer
   // delaying the start time by a 'small' amount.
   void DeferScheduledUpdate();
 
   // Starts an update now.
   void StartUpdate();
 
   // Starts the worker if it isn't already running, and calls |task| when the
   // worker is running, or |error_callback| if starting the worker failed.
-  void RunAfterStartWorker(const StatusCallback& error_callback,
-                           const base::Closure& task);
+  // If the worker is already running, |task| is executed synchronously (before
+  // this method returns).
+  void RunAfterStartWorker(const base::Closure& task,
+                           const StatusCallback& error_callback);
 
   // Call this while the worker is running before dispatching an event to the
   // worker. This informs ServiceWorkerVersion about the event in progress.
   // Returns a request id, which should later be passed to FinishRequest when
   // the event finished.
   // The |error_callback| is called if either ServiceWorkerVersion decides the
   // event is taking too long, or if for some reason the worker stops or is
   // killed before the request finishes.
   int StartRequest(ServiceWorkerMetrics::EventType event_type,
                    const StatusCallback& error_callback);
@@ skipping 630 matching lines @@
   if (!ResponseMessage::Dispatch(&message, &callback_, this, param,
                                  &CallbackType::Run))
     message.set_dispatch_error();
 
   return true;
 }
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_