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diff --git a/chrome/browser/browsing_data_quota_helper.h b/chrome/browser/browsing_data_quota_helper.h
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+++ b/chrome/browser/browsing_data_quota_helper.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 CHROME_BROWSER_BROWSING_DATA_QUOTA_HELPER_H_
+#define CHROME_BROWSER_BROWSING_DATA_QUOTA_HELPER_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/callback_old.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop_proxy.h"
+#include "base/time.h"
+#include "content/browser/browser_thread.h"
+#include "webkit/quota/quota_types.h"
+
+class Profile;
+
+namespace quota {
+class QuotaManager;
+}
+
+class BrowsingDataQuotaHelper;
+
+struct BrowsingDataQuotaHelperDeleter {
+  static void Destruct(const BrowsingDataQuotaHelper* helper);
+};
+
+// This class is an interface class to bridge between Cookies Tree and Unified
+// Quota System.  This class provides a way to get usage and quota information
+// through the instance.
+//
+// Call Create to create an instance for a profile and call StartFetching with
+// a callback to fetch information asynchronously. If result is no longer needed
+// after StartFetching, call CancelNotification to prevent callback.
+//
+// Parallel fetching is not allowed, a fetching task should start after end of
+// previous task.  All method of this class should called from UI thread.
+class BrowsingDataQuotaHelper
+    : public base::RefCountedThreadSafe<BrowsingDataQuotaHelper,
+                                        BrowsingDataQuotaHelperDeleter> {
+ public:
+  // QuotaInfo contains host-based quota and usage information for persistent
+  // and temporary storage.
+  struct QuotaInfo {
+    QuotaInfo();
+    explicit QuotaInfo(const std::string& host);
+    QuotaInfo(const std::string& host,
+              int64 temporary_usage,
+              int64 persistent_usage);
+    ~QuotaInfo();
+
+    std::string host;
+    int64 temporary_usage;
+    int64 persistent_usage;
+  };
+
+  typedef std::vector<QuotaInfo> QuotaInfoArray;
+  typedef Callback1<const QuotaInfoArray&>::Type FetchResultCallback;
+
+  static BrowsingDataQuotaHelper* Create(Profile* profile);
+
+  virtual void StartFetching(FetchResultCallback* callback) = 0;
+  virtual void CancelNotification() = 0;
+
+  // We don't support deletion now.
+  virtual void DeleteQuotaHost(const std::string& host) {}
+
+ protected:
+  explicit BrowsingDataQuotaHelper(base::MessageLoopProxy* io_thread_);
+  virtual ~BrowsingDataQuotaHelper();
+
+ private:
+  friend class DeleteTask<const BrowsingDataQuotaHelper>;
+  friend struct BrowsingDataQuotaHelperDeleter;
+  scoped_refptr<base::MessageLoopProxy> io_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowsingDataQuotaHelper);
+};
+
+bool operator <(const BrowsingDataQuotaHelper::QuotaInfo& lhs,
+                const BrowsingDataQuotaHelper::QuotaInfo& rhs);
+bool operator ==(const BrowsingDataQuotaHelper::QuotaInfo& lhs,
+                 const BrowsingDataQuotaHelper::QuotaInfo& rhs);
+
+#endif  // CHROME_BROWSER_BROWSING_DATA_QUOTA_HELPER_H_