[Pepper] Wire up append mode writing support of FileIO

ppapi/proxy/file_system_resource.h

 // Copyright (c) 2013 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_PROXY_FILE_SYSTEM_RESOURCE_H_
 #define PPAPI_PROXY_FILE_SYSTEM_RESOURCE_H_
 
 #include <map>
 #include <queue>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "ppapi/c/pp_file_info.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/private/ppb_isolated_file_system_private.h"
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/shared_impl/file_growth.h"
 #include "ppapi/thunk/ppb_file_system_api.h"
 
 namespace ppapi {
 
 class TrackedCallback;
 
 namespace proxy {
 
 class PPAPI_PROXY_EXPORT FileSystemResource
     : public PluginResource,
@@ skipping 65 matching lines @@
   int64_t reserved_quota_;
   bool reserving_quota_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_FILE_SYSTEM_RESOURCE_H_