Add point to Window class and Window polyfills of screen.

sdk/lib/html/dart2js/html_dart2js.dart

 /// The Dart HTML library.
 ///
 /// For examples, see
 /// [Dart HTML5 Samples](https://github.com/dart-lang/dart-html5-samples)
 /// on Github.
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev' hide Symbol, deprecated;
@@ skipping 24147 matching lines @@
   Selection getSelection() native;
 
   @DomName('Window.matchMedia')
   @DocsEditable()
   MediaQueryList matchMedia(String query) native;
 
   @DomName('Window.moveBy')
   @DocsEditable()
   void moveBy(num x, num y) native;
 
+  @JSName('moveTo')
   @DomName('Window.moveTo')
   @DocsEditable()
-  void moveTo(num x, num y) native;
+  void $dom_moveTo(num x, num y) native;
 
   @DomName('Window.openDatabase')
   @DocsEditable()
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
   // http://www.w3.org/TR/webdatabase/
   @Experimental() // deprecated
   @Creates('SqlDatabase')
   SqlDatabase openDatabase(String name, String version, String displayName, int estimatedSize, [DatabaseCallback creationCallback]) native;
@@ skipping 364 matching lines @@
 
 
   @DomName('DOMWindow.beforeunloadEvent')
   @DocsEditable()
   static const EventStreamProvider<BeforeUnloadEvent> beforeUnloadEvent =
       const _BeforeUnloadEventStreamProvider('beforeunload');
 
   @DomName('DOMWindow.onbeforeunload')
   @DocsEditable()
   Stream<Event> get onBeforeUnload => beforeUnloadEvent.forTarget(this);
+
+  void moveTo(Point p) => $dom_moveTo(p.x, p.y);
 }
 
 /**
  * Event object that is fired before the window is closed.
  *
  * The standard window close behavior can be prevented by setting the
  * [returnValue]. This will display a dialog to the user confirming that they
  * want to close the page.
  */
 abstract class BeforeUnloadEvent implements Event {
@@ skipping 4892 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }