ServiceWorker: Confirm the liveness of the associated context before handling message

content/browser/service_worker/service_worker_dispatcher_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_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DISPATCHER_HOST_H_
 
 #include "base/id_map.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "content/browser/service_worker/service_worker_registration_status.h"
 #include "content/public/browser/browser_message_filter.h"
 
 class GURL;
 struct EmbeddedWorkerHostMsg_ReportConsoleMessage_Params;
 
 namespace content {
 
 class MessagePortMessageFilter;
 class ServiceWorkerContextCore;
 class ServiceWorkerContextWrapper;
 class ServiceWorkerHandle;
 class ServiceWorkerProviderHost;
+class ServiceWorkerProviderHostRegistry;
 class ServiceWorkerRegistration;
 
 class CONTENT_EXPORT ServiceWorkerDispatcherHost : public BrowserMessageFilter {
  public:
   ServiceWorkerDispatcherHost(
       int render_process_id,
       MessagePortMessageFilter* message_port_message_filter);
 
   void Init(ServiceWorkerContextWrapper* context_wrapper);
 
@@ skipping 69 matching lines @@
 
   void UnregistrationComplete(int thread_id,
                               int request_id,
                               ServiceWorkerStatusCode status);
 
   void SendRegistrationError(int thread_id,
                              int request_id,
                              ServiceWorkerStatusCode status);
 
   ServiceWorkerContextCore* GetContext();
+  ServiceWorkerProviderHostRegistry* GetProviderRegistry();
 
   int render_process_id_;
   MessagePortMessageFilter* const message_port_message_filter_;
   scoped_refptr<ServiceWorkerContextWrapper> context_wrapper_;
 
   IDMap<ServiceWorkerHandle, IDMapOwnPointer> handles_;
 
   bool channel_ready_;  // True after BrowserMessageFilter::channel_ != NULL.
   ScopedVector<IPC::Message> pending_messages_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DISPATCHER_HOST_H_