Experimentally isolate GetSaveFileName in a utility process.

chrome/utility/shell_handler_win.cc

 // 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.
 
 #include "chrome/utility/shell_handler_win.h"
 
 #include <commdlg.h>
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/common/chrome_utility_messages.h"
 #include "content/public/utility/utility_thread.h"
 #include "ui/base/win/open_file_name_win.h"
 #include "ui/base/win/shell.h"
 
 ShellHandler::ShellHandler() {}
 ShellHandler::~ShellHandler() {}
 
 bool ShellHandler::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ShellHandler, message)
     IPC_MESSAGE_HANDLER(ChromeUtilityMsg_OpenItemViaShell,
                         OnOpenItemViaShell)
     IPC_MESSAGE_HANDLER(ChromeUtilityMsg_GetOpenFileName,
                         OnGetOpenFileName)
+    IPC_MESSAGE_HANDLER(ChromeUtilityMsg_GetSaveFileName,
+                        OnGetSaveFileName)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void ShellHandler::OnOpenItemViaShell(const base::FilePath& full_path) {
   ui::win::OpenItemViaShell(full_path);
 }
 
 void ShellHandler::OnGetOpenFileName(
@@ skipping 13 matching lines @@
     open_file_name.GetResult(&directory, &filenames);
 
   if (filenames.size()) {
     content::UtilityThread::Get()->Send(
         new ChromeUtilityHostMsg_GetOpenFileName_Result(directory, filenames));
   } else {
     content::UtilityThread::Get()->Send(
         new ChromeUtilityHostMsg_GetOpenFileName_Failed());
   }
 }
+
+void ShellHandler::OnGetSaveFileName(
+    const ChromeUtilityMsg_GetSaveFileName_Params& params) {
+  ui::win::OpenFileName open_file_name(params.owner, params.flags);
+  open_file_name.SetInitialSelection(params.initial_directory,
+                                     params.suggested_filename);
+  open_file_name.GetOPENFILENAME()->nFilterIndex =
+      params.one_based_filter_index;
+  open_file_name.GetOPENFILENAME()->lpstrDefExt =
+      params.default_extension.c_str();
+
+  open_file_name.MaybeInstallWindowPositionHookForSaveAsOnXP();
+
+  if (::GetSaveFileName(open_file_name.GetOPENFILENAME())) {
+    content::UtilityThread::Get()->Send(
+        new ChromeUtilityHostMsg_GetSaveFileName_Result(
+            base::FilePath(open_file_name.GetOPENFILENAME()->lpstrFile),
+            open_file_name.GetOPENFILENAME()->nFilterIndex));
+    return;
+  }
+
+  // Zero means the dialog was closed, otherwise we had an error.
+  DWORD error_code = ::CommDlgExtendedError();
+  if (error_code != 0)
+    NOTREACHED() << "GetSaveFileName failed with code: " << error_code;
+
+  content::UtilityThread::Get()->Send(
+      new ChromeUtilityHostMsg_GetSaveFileName_Failed());
+}