Add GetUsageAndQuota() to Syncable API

chrome/browser/extensions/api/sync_file_system/sync_file_system_api.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 CHROME_BROWSER_EXTENSIONS_API_SYNC_FILE_SYSTEM_SYNC_FILE_SYSTEM_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_SYNC_FILE_SYSTEM_SYNC_FILE_SYSTEM_API_H_
 
 #include "base/platform_file.h"
 #include "chrome/browser/extensions/extension_function.h"
 #include "webkit/fileapi/syncable/sync_status_code.h"
@@ skipping 19 matching lines @@
   // Returns the file system context for this extension.
   fileapi::FileSystemContext* GetFileSystemContext();
 
   void DidInitializeFileSystemContext(const std::string& service_name,
                                       fileapi::SyncStatusCode status);
   void DidOpenFileSystem(base::PlatformFileError error,
                          const std::string& file_system_name,
                          const GURL& root_url);
 };
 
+class SyncFileSystemGetUsageAndQuotaFunction
+    : public AsyncExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION_NAME("syncFileSystem.getUsageAndQuota");
+
+ protected:
+  virtual ~SyncFileSystemGetUsageAndQuotaFunction() {}
+  virtual bool RunImpl() OVERRIDE;
+
+ private:
+  void DidGetUsageAndQuota(quota::QuotaStatusCode status,
+                           int64 usage,
+                           int64 quota);
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SYNC_FILE_SYSTEM_SYNC_FILE_SYSTEM_API_H_