Do PPB_FileIO Query and Read in the plugin process.

ppapi/proxy/file_io_resource.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_PROXY_FILE_IO_RESOURCE_H_
 #define PPAPI_PROXY_FILE_IO_RESOURCE_H_
 
 #include <string>
 
 #include "ppapi/c/private/pp_file_handle.h"
@@ skipping 54 matching lines @@
   virtual int32_t WillSetLength(
       int64_t length,
       scoped_refptr<TrackedCallback> callback) OVERRIDE;
 
  private:
   int32_t ReadValidated(int64_t offset,
                         int32_t bytes_to_read,
                         const PP_ArrayOutput& array_output,
                         scoped_refptr<TrackedCallback> callback);
 
-  // Handlers of reply messages. Note that all of them have a callback
-  // parameters bound when call to the host.
+  void CloseFileHandle();
+
+  // Reply message handlers for operations that are done in the host.
   void OnPluginMsgGeneralComplete(scoped_refptr<TrackedCallback> callback,
                                   const ResourceMessageReplyParams& params);
   void OnPluginMsgOpenFileComplete(scoped_refptr<TrackedCallback> callback,
                                    const ResourceMessageReplyParams& params);
   void OnPluginMsgQueryComplete(scoped_refptr<TrackedCallback> callback,
                                 PP_FileInfo* output_info_,
                                 const ResourceMessageReplyParams& params,
                                 const PP_FileInfo& info);
   void OnPluginMsgReadComplete(scoped_refptr<TrackedCallback> callback,
                                PP_ArrayOutput array_output,
                                const ResourceMessageReplyParams& params,
                                const std::string& data);
   void OnPluginMsgRequestOSFileHandleComplete(
       scoped_refptr<TrackedCallback> callback,
       PP_FileHandle* output_handle,
       const ResourceMessageReplyParams& params);
 
+  PP_FileHandle file_handle_;
+  PP_FileSystemType file_system_type_;
   FileIOStateManager state_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(FileIOResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_FILE_IO_RESOURCE_H_