Add test for ProcessSingleton hung rendezvous case.

chrome/browser/chrome_process_finder_win.h

 // Copyright 2013 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_CHROME_PROCESS_FINDER_WIN_H_
 #define CHROME_BROWSER_CHROME_PROCESS_FINDER_WIN_H_
 
 #include <windows.h>
 
+#include "base/time/time.h"
+
 namespace base {
 class FilePath;
 }
 
 namespace chrome {
 
 enum NotifyChromeResult {
   NOTIFY_SUCCESS,
   NOTIFY_FAILED,
   NOTIFY_WINDOW_HUNG,
 };
 
 // Finds an already running Chrome window if it exists.
 HWND FindRunningChromeWindow(const base::FilePath& user_data_dir);
 
 // Attempts to send the current command line to an already running instance of
 // Chrome via a WM_COPYDATA message.
 // Returns true if a running Chrome is found and successfully notified.
 // |fast_start| is true when this is being called on the window fast start path.
 NotifyChromeResult AttemptToNotifyRunningChrome(HWND remote_window,
                                                 bool fast_start);
 
+// Changes the notification timeout to |new_timeout|, returns the old timeout.
+base::TimeDelta SetNotificationTimeoutForTesting(base::TimeDelta new_timeout);
+
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_CHROME_PROCESS_FINDER_WIN_H_