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 43 matching lines @@
     PROCESS_NOTIFIED,
     PROFILE_IN_USE,
     LOCK_ERROR,
   };
 
   // Implement this callback to handle notifications from other processes. The
   // callback will receive the command line and directory with which the other
   // Chrome process was launched. Return true if the command line will be
   // handled within the current browser instance or false if the remote process
   // should handle it (i.e., because the current process is shutting down).
-  typedef base::Callback<bool(
-      const base::CommandLine& command_line,
-      const base::FilePath& current_directory)> NotificationCallback;
+  using NotificationCallback =
+      base::Callback<bool(const base::CommandLine& command_line,
+                          const base::FilePath& current_directory)>;
 
   ProcessSingleton(const base::FilePath& user_data_dir,
                    const NotificationCallback& notification_callback);
   ~ProcessSingleton();
 
   // Notify another process, if available. Otherwise sets ourselves as the
   // singleton instance. Returns PROCESS_NONE if we became the singleton
   // instance. Callers are guaranteed to either have notified an existing
   // process or have grabbed the singleton (unless the profile is locked by an
   // unreachable process).
   // TODO(brettw): Make the implementation of this method non-platform-specific
   // by making Linux re-use the Windows implementation.
   NotifyResult NotifyOtherProcessOrCreate();
 
   // Sets ourself up as the singleton instance.  Returns true on success.  If
   // false is returned, we are not the singleton instance and the caller must
   // exit.
   // NOTE: Most callers should generally prefer NotifyOtherProcessOrCreate() to
   // 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)
+  // Called to query whether to kill a hung browser process that has visible
+  // windows. Return true to allow killing the hung process.
+  using ShouldKillRemoteProcessCallback = base::Callback<bool()>;
+  void OverrideShouldKillRemoteProcessCallbackForTesting(
+      const ShouldKillRemoteProcessCallback& 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_;
+  ShouldKillRemoteProcessCallback should_kill_remote_process_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_