Experimentally isolate GetSaveFileName in a utility process.

chrome/utility/shell_handler_win.h

 // Copyright 2014 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_UTILITY_SHELL_HANDLER_WIN_H_
 #define CHROME_UTILITY_SHELL_HANDLER_WIN_H_
 
 #include <Windows.h>
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "base/tuple.h"
 #include "chrome/utility/utility_message_handler.h"
 
 namespace base {
 class FilePath;
 }  // namespace base
 
 typedef std::vector<Tuple2<base::string16, base::string16> >
     GetOpenFileNameFilter;
 
+struct ChromeUtilityMsg_GetSaveFileName_Params;
+
 // Handles requests to execute shell operations. Used to protect the browser
 // process from instability due to 3rd-party shell extensions. Must be invoked
 // in a non-sandboxed utility process.
 class ShellHandler : public UtilityMessageHandler {
  public:
   ShellHandler();
   virtual ~ShellHandler();
 
   // IPC::Listener implementation
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
   void OnOpenItemViaShell(const base::FilePath& full_path);
+
   void OnGetOpenFileName(
     HWND owner,
     DWORD flags,
     const GetOpenFileNameFilter& filter,
     const base::FilePath& initial_directory,
     const base::FilePath& filename);
 
+  void OnGetSaveFileName(const ChromeUtilityMsg_GetSaveFileName_Params& params);
+
   DISALLOW_COPY_AND_ASSIGN(ShellHandler);
 };
 
 #endif  // CHROME_UTILITY_SHELL_HANDLER_WIN_H_