Restart running apps when chrome restarts.

chrome/common/extensions/docs/samples.json

 {
   "api": {
     "chrome.alarms.clear": "alarms.html#method-clear",
     "chrome.alarms.clearAll": "alarms.html#method-clearAll",
     "chrome.alarms.create": "alarms.html#method-create",
     "chrome.alarms.get": "alarms.html#method-get",
     "chrome.alarms.getAll": "alarms.html#method-getAll",
     "chrome.alarms.onAlarm": "alarms.html#event-onAlarm",
     "chrome.app.runtime.onLaunched": "app.runtime.html#event-onLaunched",
+    "chrome.app.runtime.onRestarted": "app.runtime.html#event-onRestarted",
     "chrome.app.window.create": "app.window.html#method-create",
     "chrome.app.window.focus": "app.window.html#method-focus",
     "chrome.app.window.maximize": "app.window.html#method-maximize",
     "chrome.app.window.minimize": "app.window.html#method-minimize",
     "chrome.app.window.moveTo": "app.window.html#method-moveTo",
     "chrome.app.window.resizeTo": "app.window.html#method-resizeTo",
     "chrome.app.window.restore": "app.window.html#method-restore",
     "chrome.bookmarks.create": "bookmarks.html#method-create",
     "chrome.bookmarks.get": "bookmarks.html#method-get",
     "chrome.bookmarks.getChildren": "bookmarks.html#method-getChildren",
@@ skipping 2823 matching lines @@
         "manifest.json",
         "popup.html",
         "popup.js",
         "sample.css"
       ],
       "source_hash": "8e51dc3a9577065d22ce92f3c838edc5ceaf4e65",
       "zip_path": "examples/api/extension/isAllowedAccess.zip"
     }
   ]
 }