Pepper/Flapper: Add an interface to do sync file ops on FileRefs.

webkit/plugins/ppapi/ppb_flash_file_impl.h

 // 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_PLUGINS_PPAPI_PPB_FLASH_FILE_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_FLASH_FILE_IMPL_H_
 
+struct PPB_Flash_File_FileRef;
 struct PPB_Flash_File_ModuleLocal;
 
 namespace webkit {
 namespace ppapi {
 
 class PPB_Flash_File_ModuleLocal_Impl {
  public:
   static const PPB_Flash_File_ModuleLocal* GetInterface();
 };
 
+class PPB_Flash_File_FileRef_Impl {
+ public:
+  static const PPB_Flash_File_FileRef* GetInterface();
+};
+
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_FLASH_FILE_IMPL_H_