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diff --git a/webkit/quota/quota_client.h b/webkit/quota/quota_client.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 WEBKIT_QUOTA_QUOTA_CLIENT_H_
+#define WEBKIT_QUOTA_QUOTA_CLIENT_H_
+
+#include <set>
+#include <list>
+
+#include "base/callback.h"
+#include "base/time.h"
+#include "googleurl/src/gurl.h"
+#include "webkit/quota/quota_types.h"
+
+namespace quota {
+
+// An abstract interface for quota manager clients.
+// Each storage API must provide an implementation of this interface and
+// register it to the quota manager.
+// All the methods are assumed to be called on the IO thread in the browser.
+class QuotaClient {
+ public:
+  typedef Callback1<int64>::Type GetUsageCallback;
+  typedef Callback1<const std::set<GURL>&>::Type GetOriginsCallback;
+
+  virtual ~QuotaClient() {}
+
+  enum ID {
+    kUnknown,
+    kFileSystem,
+    kDatabase,
+    kAppcache,
+    kIndexedDatabase,
+    kMockStart,  // This needs to be the end of the enum.
+  };
+
+  virtual ID id() const = 0;
+
+  // Called by the QuotaManager.
+  // Gets the amount of data stored in the storage specified by
+  // |origin_url| and |type|.
+  virtual void GetOriginUsage(const GURL& origin_url,
+                              StorageType type,
+                              GetUsageCallback* callback) = 0;
+
+  // Called by the QuotaManager.
+  // Returns a list of origins that has data in the |type| storage.
+  virtual void GetOriginsForType(StorageType type,
+                                 GetOriginsCallback* callback) = 0;
+
+  // Called by the QuotaManager.
+  // Returns a list of origins that match the |host|.
+  virtual void GetOriginsForHost(StorageType type,
+                                 const std::string& host,
+                                 GetOriginsCallback* callback) = 0;
+};
+
+typedef std::list<QuotaClient*> QuotaClientList;
+
+}  // namespace quota
+
+#endif  // WEBKIT_QUOTA_QUOTA_CLIENT_H_