Add badge to web notifications.

third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt

 CONSOLE WARNING: 'webkitOfflineAudioContext' is deprecated. Please use 'OfflineAudioContext' instead.
 CONSOLE WARNING: 'webkitAudioContext' is deprecated. Please use 'AudioContext' instead.
 CONSOLE WARNING: 'window.webkitStorageInfo' is deprecated. Please use 'navigator.webkitTemporaryStorage' or 'navigator.webkitPersistentStorage' instead.
 CONSOLE WARNING: 'webkitIDBTransaction' is deprecated. Please use 'IDBTransaction' instead.
 CONSOLE WARNING: 'webkitIDBRequest' is deprecated. Please use 'IDBRequest' instead.
 CONSOLE WARNING: 'webkitIDBObjectStore' is deprecated. Please use 'IDBObjectStore' instead.
 CONSOLE WARNING: 'webkitIDBKeyRange' is deprecated. Please use 'IDBKeyRange' instead.
 CONSOLE WARNING: 'webkitIDBIndex' is deprecated. Please use 'IDBIndex' instead.
 CONSOLE WARNING: 'webkitIDBFactory' is deprecated. Please use 'IDBFactory' instead.
 CONSOLE WARNING: 'webkitIDBDatabase' is deprecated. Please use 'IDBDatabase' instead.
@@ skipping 3934 matching lines @@
     method forEach
     method item
     method keys
     method values
 interface Notification : EventTarget
     static getter maxActions
     static getter permission
     static method requestPermission
     attribute @@toStringTag
     getter actions
+    getter badge
     getter body
     getter data
     getter dir
     getter icon
     getter lang
     getter onclick
     getter onclose
     getter onerror
     getter onshow
     getter renotify
@@ skipping 3591 matching lines @@
     method stop
     method webkitCancelAnimationFrame
     method webkitCancelRequestAnimationFrame
     method webkitRequestAnimationFrame
     method webkitRequestFileSystem
     method webkitResolveLocalFileSystemURL
 PASS successfullyParsed is true
 
 TEST COMPLETE