Allow all events to be accessed via on[foo] instead of just onFoo

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index ec9e4c41606952cc9122272346187a92d483c126..5edab509c8a88ea1efcc6a12f04897eaa97e4328 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -11573,10 +11573,29 @@ class Events {
 class ElementEvents extends Events {
   /* Raw event target. */
   final Element _ptr;
+  static final webkitEvents = {
+    'fullscreenchange' : 'onwebkitfullscreenchange', 
+    'fullscreenerror' : 'onwebkitfullscreenerror',
+    'pointerlockchange' : 'onwebkitpointerlockchange', 
+    'pointerlockerror' : 'onwebkitpointerlockerror', 
+    'keyadded' : 'onwebkitkeyadded', 
+    'keyerror' : 'onwebkitkeyerror', 
+    'keymessage' : 'onwebkitkeymessage', 
+    'needkey' : 'onwebkitneedkey', 
+    'resourcetimingbufferfull' : 'onwebkitresourcetimingbufferfull', 
+    'animationend' : 'onwebkitAnimationEnd', 
+    'animationiteration' : 'onwebkitAnimationIteration', 
+    'animationstart' : 'onwebkitAnimationStart', 
+    'speechchange' : 'onwebkitSpeechChange'
+  };
 
   ElementEvents(Element ptr) : this._ptr = ptr, super(ptr);
 
   Stream operator [](String type) {
+    if (type.toLowerCase() in webkitEvents.keys) {
+      return new _ElementEventStreamImpl(
+          _ptr, webkitEvents[type.toLowerCase()], false);
+    }
     return new _ElementEventStreamImpl(_ptr, type, false);
   }
 }