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diff --git a/storage/browser/quota/quota_manager_proxy.h b/storage/browser/quota/quota_manager_proxy.h
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+++ b/storage/browser/quota/quota_manager_proxy.h
@@ -0,0 +1,79 @@
+// Copyright 2014 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 STORAGE_BROWSER_QUOTA_QUOTA_MANAGER_PROXY_H_
+#define STORAGE_BROWSER_QUOTA_QUOTA_MANAGER_PROXY_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/files/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/sequenced_task_runner_helpers.h"
+#include "storage/browser/quota/quota_callbacks.h"
+#include "storage/browser/quota/quota_client.h"
+#include "storage/browser/quota/quota_database.h"
+#include "storage/browser/quota/quota_manager.h"
+#include "storage/browser/quota/quota_task.h"
+#include "storage/browser/quota/special_storage_policy.h"
+#include "storage/browser/storage_browser_export.h"
+
+namespace base {
+class SequencedTaskRunner;
+class SingleThreadTaskRunner;
+}
+
+namespace storage {
+
+// The proxy may be called and finally released on any thread.
+class STORAGE_EXPORT QuotaManagerProxy
+    : public base::RefCountedThreadSafe<QuotaManagerProxy> {
+ public:
+  typedef QuotaManager::GetUsageAndQuotaCallback
+      GetUsageAndQuotaCallback;
+
+  virtual void RegisterClient(QuotaClient* client);
+  virtual void NotifyStorageAccessed(QuotaClient::ID client_id,
+                                     const GURL& origin,
+                                     StorageType type);
+  virtual void NotifyStorageModified(QuotaClient::ID client_id,
+                                     const GURL& origin,
+                                     StorageType type,
+                                     int64 delta);
+  virtual void NotifyOriginInUse(const GURL& origin);
+  virtual void NotifyOriginNoLongerInUse(const GURL& origin);
+
+  virtual void SetUsageCacheEnabled(QuotaClient::ID client_id,
+                                    const GURL& origin,
+                                    StorageType type,
+                                    bool enabled);
+  virtual void GetUsageAndQuota(
+      base::SequencedTaskRunner* original_task_runner,
+      const GURL& origin,
+      StorageType type,
+      const GetUsageAndQuotaCallback& callback);
+
+  // This method may only be called on the IO thread.
+  // It may return NULL if the manager has already been deleted.
+  QuotaManager* quota_manager() const;
+
+ protected:
+  friend class QuotaManager;
+  friend class base::RefCountedThreadSafe<QuotaManagerProxy>;
+
+  QuotaManagerProxy(
+      QuotaManager* manager,
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_thread);
+  virtual ~QuotaManagerProxy();
+
+  QuotaManager* manager_;  // only accessed on the io thread
+  scoped_refptr<base::SingleThreadTaskRunner> io_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuotaManagerProxy);
+};
+
+}  // namespace storage
+
+#endif  // STORAGE_BROWSER_QUOTA_QUOTA_MANAGER_PROXY_H_