Add test for ProcessSingleton hung rendezvous case.

chrome/browser/chrome_process_finder_win.h

Index: chrome/browser/chrome_process_finder_win.h
diff --git a/chrome/browser/chrome_process_finder_win.h b/chrome/browser/chrome_process_finder_win.h
index bc5c81f027a540470a94306456179dba3e6ae98b..a66429de5e7462310ec422d8e682b343af6bbfbf 100644
--- a/chrome/browser/chrome_process_finder_win.h
+++ b/chrome/browser/chrome_process_finder_win.h
@@ -7,6 +7,8 @@
 
 #include <windows.h>
 
+#include "base/time/time.h"
+
 namespace base {
 class FilePath;
 }
@@ -29,6 +31,9 @@ HWND FindRunningChromeWindow(const base::FilePath& user_data_dir);
 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_