Beginning fix for KeyEvent,KeyboardEvent and UIEvent changes in roll 45

tools/dom/src/dartium_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 25 matching lines @@
    */
   @Deprecated("Internal Use Only")
   js.JsObject blink_jsObject;
 
   /** The parent KeyboardEvent that this KeyEvent is wrapping and "fixing". */
   KeyboardEvent _parent;
 
   /** The "fixed" value of whether the alt key is being pressed. */
   bool _shadowAltKey;
 
-  /** Caculated value of what the estimated charCode is for this event. */
+  /** Calculated value of what the estimated charCode is for this event. */
   int _shadowCharCode;
 
-  /** Caculated value of what the estimated keyCode is for this event. */
+  /** Calculated value of what the estimated keyCode is for this event. */
   int _shadowKeyCode;
 
-  /** Caculated value of what the estimated keyCode is for this event. */
+  /** Calculated value of what the estimated keyCode is for this event. */
   int get keyCode => _shadowKeyCode;
 
-  /** Caculated value of what the estimated charCode is for this event. */
+  /** Calculated value of what the estimated charCode is for this event. */
   int get charCode => this.type == 'keypress' ? _shadowCharCode : 0;
 
-  /** Caculated value of whether the alt key is pressed is for this event. */
+  /** Calculated value of whether the alt key is pressed is for this event. */
   bool get altKey => _shadowAltKey;
 
-  /** Caculated value of what the estimated keyCode is for this event. */
+  /** Calculated value of what the estimated keyCode is for this event. */
   int get which => keyCode;
 
   /** Accessor to the underlying keyCode value is the parent event. */
   int get _realKeyCode => _parent.keyCode;
 
   /** Accessor to the underlying charCode value is the parent event. */
   int get _realCharCode => _parent.charCode;
 
   /** Accessor to the underlying altKey value is the parent event. */
   bool get _realAltKey => _parent.altKey;
@@ skipping 60 matching lines @@
   bool get shiftKey => _parent.shiftKey;
   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 => _parent._keyIdentifier;
 
   int get _charCode => charCode;
   int get _keyCode => keyCode;
+  int get _which => which;
   String get _keyIdentifier {
     throw new UnsupportedError("keyIdentifier is unsupported.");
   }
   void _initKeyboardEvent(String type, bool canBubble, bool cancelable,
       Window view, String keyIdentifier, int keyLocation, bool ctrlKey,
       bool altKey, bool shiftKey, bool metaKey) {
     throw new UnsupportedError(
         "Cannot initialize a KeyboardEvent from a KeyEvent.");
   }
-  int get _layerX => throw new UnsupportedError('Not applicable to KeyEvent');
-  int get _layerY => throw new UnsupportedError('Not applicable to KeyEvent');
-  int get _pageX => throw new UnsupportedError('Not applicable to KeyEvent');
-  int get _pageY => throw new UnsupportedError('Not applicable to KeyEvent');
   @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();
 }