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

webkit/dom_storage/dom_storage_proxy.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 WEBKIT_DOM_STORAGE_CACHED_AREA_H_
+#define WEBKIT_DOM_STORAGE_CACHED_AREA_H_
+#pragma once
+
+#include "base/bind.h"
+#include "base/memory/ref_counted.h"
+#include "base/nullable_string16.h"
+#include "base/string16.h"
+#include "googleurl/src/gurl.h"
+#include "webkit/dom_storage/dom_storage_types.h"
+
+namespace dom_storage {
+
+// Abstract interface for cached area renderer to browser communications.
+class DomStorageProxy : public base::RefCounted<DomStorageProxy> {
+ public:
+  typedef base::Callback<void(bool)> AsyncOperationCallback;
+
+  virtual void LoadArea(int connection_id, ValuesMap* values,
+                        const AsyncOperationCallback& callback) = 0;
+
+  virtual void SetItem(int connection_id, const string16& key,
+                       const string16& value, const GURL& page_url,
+                       const AsyncOperationCallback& callback) = 0;
+
+  virtual void RemoveItem(int connection_id, const string16& key,
+                          const GURL& page_url,
+                          const AsyncOperationCallback& callback) = 0;
+
+  virtual void ClearArea(int connection_id,
+                        const GURL& page_url,
+                        const AsyncOperationCallback& callback) = 0;
+ protected:
+  friend class base::RefCounted<DomStorageProxy>;
+  virtual ~DomStorageProxy() {}
+};
+
+}  // namespace dom_storage
+
+#endif  // WEBKIT_DOM_STORAGE_DOM_STORAGE_AREA_H_