gdata: Fix "save as pdf" to work on Google Drive.

chrome/browser/chromeos/gdata/mock_gdata_file_system.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_CHROMEOS_GDATA_MOCK_GDATA_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_MOCK_GDATA_FILE_SYSTEM_H_
 
 #include <string>
 
 #include "chrome/browser/chromeos/gdata/gdata_file_system_interface.h"
@@ skipping 24 matching lines @@
                     const FilePath& remote_dest_file_path,
                     const FileOperationCallback& callback));
   MOCK_METHOD3(TransferFileFromLocalToRemote,
                void(const FilePath& local_src_file_path,
                     const FilePath& remote_dest_file_path,
                     const FileOperationCallback& callback));
   MOCK_METHOD2(OpenFile, void(const FilePath& file_path,
                               const OpenFileCallback& callback));
   MOCK_METHOD2(CloseFile, void(const FilePath& file_path,
                               const FileOperationCallback& callback));
+  MOCK_METHOD2(PrepareWritableFileAndRun,
+               void(const FilePath& file_path,
+                    const OpenFileCallback& callback));
   MOCK_METHOD3(Copy, void(const FilePath& src_file_path,
                           const FilePath& dest_file_path,
                           const FileOperationCallback& callback));
   MOCK_METHOD3(Move, void(const FilePath& src_file_path,
                           const FilePath& dest_file_path,
                           const FileOperationCallback& callback));
   MOCK_METHOD3(Remove, void(const FilePath& file_path,
                             bool is_recursive,
                             const FileOperationCallback& callback));
   MOCK_METHOD4(CreateDirectory,
@@ skipping 30 matching lines @@
                                const FilePath& file,
                                scoped_ptr<DocumentEntry> entry,
                                const FilePath& file_content_path,
                                GDataCache::FileOperationType cache_operation,
                                const base::Closure& callback) OVERRIDE {}
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_MOCK_GDATA_FILE_SYSTEM_H_