Add a new app API to enable watchdog behavior restarts in kiosk apps

extensions/common/api/runtime.json

 // Copyright 2014 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.
 
 // Note: Many of these functions and events are implemented by hand and should
 // not elicit any code generation from the schema compiler. These items are
 // marked "nocompile."
 [
   {
     "namespace": "runtime",
@@ skipping 246 matching lines @@
           }
         ]
       },
       {
         "name": "restart",
         "description": "Restart the ChromeOS device when the app runs in kiosk mode. Otherwise, it's no-op.",
         "type": "function",
         "parameters": []
       },
       {
+        "name": "restartAfterDelay",
+        "description": "Restart the ChromeOS device when the app runs in kiosk mode after the given seconds. If called again before the time ends, the reboot will be delayed. If called with a value of -1, the reboot will be cancelled. It's a no-op in non-kiosk mode. It's only allowed to be called repeatedly by the first extension to invoke this API.",
+        "type": "function",
+        "parameters": [
+          {
+            "type": "integer",
+            "name": "seconds",
+            "description": "Time to wait in seconds before rebooting the device, or -1 to cancel a scheduled reboot."
+          },
+          {
+            "type": "function",
+            "name": "callback",
+            "description": "A callback to be invoked when a restart request was successfully rescheduled.",
+            "optional": true
+          }
+        ]
+      },
+      {
         "name": "connect",
         "type": "function",
         "nocompile": true,
         "description": "Attempts to connect to connect listeners within an extension/app (such as the background page), or other extensions/apps. This is useful for content scripts connecting to their extension processes, inter-app/extension communication, and <a href=\"manifest/externally_connectable.html\">web messaging</a>. Note that this does not connect to any listeners in a content script. Extensions may connect to content scripts embedded in tabs via $(ref:tabs.connect).",
         "parameters": [
           {"type": "string", "name": "extensionId", "optional": true, "description": "The ID of the extension or app to connect to. If omitted, a connection will be attempted with your own extension. Required if sending messages from a web page for <a href=\"manifest/externally_connectable.html\">web messaging</a>."},
           {
             "type": "object",
             "name": "connectInfo",
             "properties": {
@@ skipping 266 matching lines @@
           {
             "$ref": "OnRestartRequiredReason",
             "name": "reason",
             "description": "The reason that the event is being dispatched."
           }
         ]
       }
     ]
   }
 ]