Restart running apps when chrome restarts.

chrome/common/extensions/api/app_runtime.idl

 // 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.
 
 namespace app.runtime {
 
   callback NullCallback = void ();
 
   // A WebIntents intent object.
   [inline_doc] dictionary Intent {
@@ skipping 13 matching lines @@
     NullCallback postFailure;
   };
 
   // Optional data for the launch.
   [inline_doc] dictionary LaunchData {
     Intent intent;
   };
 
   interface Events {
     static void onLaunched(optional LaunchData launchData);
+    static void onRestarted();
   };
 
 };