Add test for ProcessSingleton hung rendezvous case.

chrome/browser/process_singleton.h

 // Copyright (c) 2012 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_PROCESS_SINGLETON_H_
 #define CHROME_BROWSER_PROCESS_SINGLETON_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 74 matching lines @@
   // this method, only callers for whom failure is preferred to notifying
   // another process should call this directly.
   bool Create();
 
   // Clear any lock state during shutdown.
   void Cleanup();
 
 #if defined(OS_POSIX) && !defined(OS_ANDROID)
   static void DisablePromptForTesting();
 #endif
+#if defined(OS_WIN)
+  typedef base::Callback<bool()> DisplayShouldKillMessageBoxCallback;

[gab, 2015/03/11 13:20:39]

Add a comment to explain what it means for this callback to return true/false.

[gab, 2015/03/11 13:20:39]

New C++11 syntax is prefered these days, i.e.:

using DisplayShouldKillMessageBoxCallback = base::Callback<bool()>;

[Sigurður Ásgeirsson, 2015/03/11 14:32:37]

Done.

[Sigurður Ásgeirsson, 2015/03/11 14:32:37]

Done.

+  void OverrideKillMessageBoxCallbackForTesting(
+      const DisplayShouldKillMessageBoxCallback& display_dialog_callback);
+#endif
 
  protected:
   // Notify another process, if available.
   // Returns true if another process was found and notified, false if we should
   // continue with the current process.
   // On Windows, Create() has to be called before this.
   NotifyResult NotifyOtherProcess();
 
 #if defined(OS_POSIX) && !defined(OS_ANDROID)
   // Exposed for testing.  We use a timeout on Linux, and in tests we want
@@ skipping 16 matching lines @@
   NotificationCallback notification_callback_;  // Handler for notifications.
 
 #if defined(OS_WIN)
   bool EscapeVirtualization(const base::FilePath& user_data_dir);
 
   HWND remote_window_;  // The HWND_MESSAGE of another browser.
   base::win::MessageWindow window_;  // The message-only window.
   bool is_virtualized_;  // Stuck inside Microsoft Softricity VM environment.
   HANDLE lock_file_;
   base::FilePath user_data_dir_;
+  DisplayShouldKillMessageBoxCallback display_should_kill_messagebox_callback_;
 #elif defined(OS_POSIX) && !defined(OS_ANDROID)
   // Return true if the given pid is one of our child processes.
   // Assumes that the current pid is the root of all pids of the current
   // instance.
   bool IsSameChromeInstance(pid_t pid);
 
   // Extract the process's pid from a symbol link path and if it is on
   // the same host, kill the process, unlink the lock file and return true.
   // If the process is part of the same chrome instance, unlink the lock file
   // and return true without killing it.
@@ skipping 25 matching lines @@
   // Helper class for linux specific messages.  LinuxWatcher is ref counted
   // because it posts messages between threads.
   class LinuxWatcher;
   scoped_refptr<LinuxWatcher> watcher_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ProcessSingleton);
 };
 
 #endif  // CHROME_BROWSER_PROCESS_SINGLETON_H_