PPAPI: Implement PPB_FileMapping on POSIX

ppapi/shared_impl/singleton_resource_id.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 PPAPI_SHARED_IMPL_SINGLETON_RESOURCE_ID_H_
 #define PPAPI_SHARED_IMPL_SINGLETON_RESOURCE_ID_H_
 
 namespace ppapi {
 
 // These IDs are used to access singleton resource objects using
 // PPB_Instance_API.GetSingletonResource.
 enum SingletonResourceID {
   // TODO(raymes): The broker resource isn't really a singleton. This is only
   // a hack until PPB_Broker trusted has been fully refactored to the new
   // resource model.
   BROKER_SINGLETON_ID,
   BROWSER_FONT_SINGLETON_ID,
   EXTENSIONS_COMMON_SINGLETON_ID,
+  FILE_MAPPING_SINGLETON_ID,
   FLASH_CLIPBOARD_SINGLETON_ID,
   FLASH_FILE_SINGLETON_ID,
   FLASH_FULLSCREEN_SINGLETON_ID,
   FLASH_SINGLETON_ID,
   GAMEPAD_SINGLETON_ID,
   ISOLATED_FILESYSTEM_SINGLETON_ID,
   NETWORK_PROXY_SINGLETON_ID,
   PDF_SINGLETON_ID,
   TRUETYPE_FONT_SINGLETON_ID,
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_SINGLETON_RESOURCE_ID_H_