Roll 50: Updated for push to origin/master.

tools/dom/src/dart2js_KeyEvent.dart

 /**
  * A custom KeyboardEvent that attempts to eliminate cross-browser
  * inconsistencies, and also provide both keyCode and charCode information
  * for all key events (when such information can be determined).
  *
  * KeyEvent tries to provide a higher level, more polished keyboard event
  * information on top of the "raw" [KeyboardEvent].
  *
  * The mechanics of using KeyEvents is a little different from the underlying
  * [KeyboardEvent]. To use KeyEvents, you need to create a stream and then add
@@ skipping 45 matching lines @@
 
   /** Accessor to the underlying charCode value is the parent event. */
   int get _realCharCode => JS('int', '#.charCode', _parent);
 
   /** Accessor to the underlying altKey value is the parent event. */
   bool get _realAltKey => JS('bool', '#.altKey', _parent);
 
   /** Shadows on top of the parent's currentTarget. */
   EventTarget _currentTarget;
 
+  final InputDeviceCapabilities sourceCapabilities;
+
   /**
    * The value we want to use for this object's dispatch. Created here so it is
    * only invoked once.
    */
   static final _keyboardEventDispatchRecord = _makeRecord();
 
   /** Helper to statically create the dispatch record. */
   static _makeRecord() {
     var interceptor = JS_INTERCEPTOR_CONSTANT(KeyboardEvent);
     return makeLeafDispatchRecord(interceptor);
@@ skipping 133 matching lines @@
   /**
    * Accessor to the part of the keyboard that the key was pressed from (one of
    * KeyLocation.STANDARD, KeyLocation.RIGHT, KeyLocation.LEFT,
    * KeyLocation.NUMPAD, KeyLocation.MOBILE, KeyLocation.JOYSTICK).
    */
   int get keyLocation => _parent.keyLocation;
   /** True if the Meta (or Mac command) key is pressed during this event. */
   bool get metaKey => _parent.metaKey;
   /** True if the shift key was pressed during this event. */
   bool get shiftKey => _parent.shiftKey;
-  InputDevice get sourceDevice => _parent.sourceDevice;
   Window get view => _parent.view;
   void _initUIEvent(
       String type, bool canBubble, bool cancelable, Window view, int detail) {
     throw new UnsupportedError("Cannot initialize a UI Event from a KeyEvent.");
   }
 
   String get _shadowKeyIdentifier => JS('String', '#.keyIdentifier', _parent);
 
   int get _charCode => charCode;
   int get _keyCode => keyCode;
@@ skipping 19 matching lines @@
   }
 
   @Experimental() // untriaged
   bool getModifierState(String keyArgument) => throw new UnimplementedError();
   @Experimental() // untriaged
   int get location => throw new UnimplementedError();
   @Experimental() // untriaged
   bool get repeat => throw new UnimplementedError();
   dynamic get _get_view => throw new UnimplementedError();
 }