Switch to using the async DomStorage IPC messages and add a caching layer …

content/renderer/dom_storage/dom_storage_dispatcher.h

 // Copyright (c) 2012 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_RENDERER_DOM_STORAGE_DOM_STORAGE_DISPATCHER_H_
 #define CONTENT_RENDERER_DOM_STORAGE_DOM_STORAGE_DISPATCHER_H_
 #pragma once
 
-#include "ipc/ipc_channel.h"
+#include "base/memory/ref_counted.h"
 
+class GURL;
 struct DOMStorageMsg_Event_Params;
+namespace dom_storage {
+class DomStorageCachedArea;
+}
+namespace IPC {
+class Message;
+}
 
 // Dispatches DomStorage related messages sent to a renderer process from the
 // main browser process. There is one instance per child process. Messages
 // are dispatched on the main renderer thread. The RenderThreadImpl
-// creates an instance and delegates calls to it.
-class DomStorageDispatcher : public IPC::Channel::Listener {
+// creates an instance and delegates calls to it. This classes also manages
+// the collection of DomStorageCachedAreas that are active in the process.
+class DomStorageDispatcher {
  public:
-  DomStorageDispatcher() {}
+  DomStorageDispatcher();
+  ~DomStorageDispatcher();
 
-  // IPC::Channel::Listener implementation
-  virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
+  // Each call to open should be balanced with a call to close.
+  scoped_refptr<dom_storage::DomStorageCachedArea> OpenCachedArea(
+      int connection_id, int64 namespace_id, const GURL& origin);
+  void CloseCachedArea(
+      int connection_id, dom_storage::DomStorageCachedArea* area);
+
+  bool OnMessageReceived(const IPC::Message& msg);
 
  private:
+  class ProxyImpl;
+
   // IPC message handlers
   void OnStorageEvent(const DOMStorageMsg_Event_Params& params);
+  void OnAsyncOperationComplete(bool success);
+
+  scoped_refptr<ProxyImpl> proxy_;
 };
 
 #endif  // CONTENT_RENDERER_DOM_STORAGE_DOM_STORAGE_DISPATCHER_H_