Add IPC plumbing code for Quota API

content/common/quota_dispatcher.h

Index: content/common/quota_dispatcher.h
diff --git a/content/common/quota_dispatcher.h b/content/common/quota_dispatcher.h
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+// Copyright (c) 2011 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_COMMON_QUOTA_DISPATCHER_H_
+#define CONTENT_COMMON_QUOTA_DISPATCHER_H_
+
+#include <map>
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/id_map.h"
+#include "ipc/ipc_channel.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebStorageQuotaError.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebStorageQuotaType.h"
+
+class GURL;
+
+namespace IPC {
+class Message;
+}
+
+namespace WebKit {
+class WebStorageQuotaCallbacks;
+}
+
+// Dispatches and sends quota related messages sent to/from a child
+// process from/to the main browser process.  There is one instance
+// per child process.  Messages are dispatched on the main child thread.
+class QuotaDispatcher : public IPC::Channel::Listener {
+ public:
+  QuotaDispatcher();
+  ~QuotaDispatcher();
+
+  // IPC::Channel::Listener implementation.
+  virtual bool OnMessageReceived(const IPC::Message& msg);
+
+  void QueryStorageUsageAndQuota(const GURL& gurl,
+                                 WebKit::WebStorageQuotaType type,
+                                 WebKit::WebStorageQuotaCallbacks* callbacks);
+  void RequestStorageQuota(const GURL& gurl,
+                           WebKit::WebStorageQuotaType type,
+                           unsigned long long requested_size,
+                           WebKit::WebStorageQuotaCallbacks* callbacks);
+
+ private:
+  // Message handlers.
+  void DidQueryStorageUsageAndQuota(int request_id,
+                                    int64 current_usage,
+                                    int64 current_quota);
+  void DidGrantStorageQuota(int request_id,
+                            int64 granted_quota);
+  void DidFail(int request_id,
+               WebKit::WebStorageQuotaError error);
+
+  IDMap<WebKit::WebStorageQuotaCallbacks> pending_quota_callbacks_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuotaDispatcher);
+};
+
+#endif  // CONTENT_COMMON_QUOTA_DISPATCHER_H_