Add SetFileSize() IPC for WebSQL.

storage/browser/database/vfs_backend.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 STORAGE_BROWSER_DATABASE_VFS_BACKEND_H_
 #define STORAGE_BROWSER_DATABASE_VFS_BACKEND_H_
 
 #include "base/files/file.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 12 matching lines @@
 
   static base::File OpenTempFileInDirectory(const base::FilePath& dir_path,
                                             int desired_flags);
 
   static int DeleteFile(const base::FilePath& file_path, bool sync_dir);
 
   static uint32 GetFileAttributes(const base::FilePath& file_path);
 
   static int64 GetFileSize(const base::FilePath& file_path);
 
+  static bool SetFileSize(const base::FilePath& file_path, int64 size);
+
   // Used to make decisions in the DatabaseDispatcherHost.
   static bool OpenTypeIsReadWrite(int desired_flags);
 
  private:
   static bool OpenFileFlagsAreConsistent(int desired_flags);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_DATABASE_VFS_BACKEND_H_