app_mode: Add runtime.onRestartRequired event.

chrome/common/extensions/api/runtime.json

Index: chrome/common/extensions/api/runtime.json
diff --git a/chrome/common/extensions/api/runtime.json b/chrome/common/extensions/api/runtime.json
index ad655e114396891b6f2bf5bd7a4161912e76bc15..2ca1fdf00cfd69a2ed1398498bf40a0bc97c0e4f 100644
--- a/chrome/common/extensions/api/runtime.json
+++ b/chrome/common/extensions/api/runtime.json
@@ -408,10 +408,20 @@
           "optional": "true",
           "description": "Return true from the event listener if you wish to call <code>sendResponse</code> after the event listener returns."
         }
+      },
+      {
+        "name": "onRestartRequired",
+        "type": "function",
+        "description": "Fired when a ChromeOS device running in kiosk mode needs to be restarted. The kiosk app should close all its windows at its earliest convenient time to let the restart to happen. If the app does nothing, a restart will be enforced after a 24-hour grace period has passed.",

[bartfab (slow), 2013/06/17 23:30:59]

Nit: s/ChromeOS/Chrome OS/

Also, how about we document this method in a more generic manner and then
mention that it currently is supported for kiosk mode only? I can see us
supporting this for all session types in the future.

[xiyuan, 2013/06/20 02:17:12]

Done.

+        "parameters": [
+          {
+            "type": "string",
+            "name": "reason",
+            "description": "The reason that the event is being dispatched.",
+            "enum": ["app_update","os_update","periodic"]
+          }
+        ]
       }
-
-
-
     ]
   }
 ]