Clamp scrollX, scrollY, pageXOffset, and pageYOffset from double to int

tools/dom/templates/html/impl/impl_Window.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 @DocsEditable()
 $if DART2JS
 $(ANNOTATIONS)@Native("Window,DOMWindow")
 $(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
@@ skipping 236 matching lines @@
    * * [Window.moveTo]
    * (https://developer.mozilla.org/en-US/docs/Web/API/Window.moveTo) from MDN.
    * * [Window.moveTo]
    * (http://dev.w3.org/csswg/cssom-view/#dom-window-moveto) from W3C.
    */
   void moveTo(Point p) {
     _moveTo(p.x, p.y);
   }
 
 $if DART2JS
+  @DomName('Window.pageXOffset')
+  @DocsEditable()
+  int get pageXOffset => JS('num', '#.pageXOffset', this).round();
+
+  @DomName('Window.pageYOffset')
+  @DocsEditable()
+  int get pageYOffset => JS('num', '#.pageYOffset', this).round();
+
   /**
    * The distance this window has been scrolled horizontally.
    *
    * ## Other resources
    *
    * * [The Screen interface specification]
    * (http://www.w3.org/TR/cssom-view/#screen) from W3C.
    * * [scrollX]
    * (https://developer.mozilla.org/en-US/docs/Web/API/Window.scrollX) from MDN.
    */
-  int get scrollX => JS('bool', '("scrollX" in #)', this) ? JS('int',
-      '#.scrollX', this) : document.documentElement.scrollLeft;
+  @DomName('Window.scrollX')
+  @DocsEditable()
+  int get scrollX => JS('bool', '("scrollX" in #)', this) ?
+      JS('num', '#.scrollX', this).round() :
+      document.documentElement.scrollLeft;
 
   /**
    * The distance this window has been scrolled vertically.
    *
    * ## Other resources
    *
    * * [The Screen interface specification]
    * (http://www.w3.org/TR/cssom-view/#screen) from W3C.
    * * [scrollY]
    * (https://developer.mozilla.org/en-US/docs/Web/API/Window.scrollY) from MDN.
    */
-  int get scrollY => JS('bool', '("scrollY" in #)', this) ? JS('int',
-      '#.scrollY', this) : document.documentElement.scrollTop;
+  @DomName('Window.scrollY')
+  @DocsEditable()
+  int get scrollY => JS('bool', '("scrollY" in #)', this) ?
+      JS('num', '#.scrollY', this).round() :
+      document.documentElement.scrollTop;
+$else
+  @DomName('Window.pageXOffset')
+  @DocsEditable()
+  int get pageXOffset => _blink.BlinkWindow.instance.pageXOffset_Getter_(this).round();
+
+  @DomName('Window.pageYOffset')
+  @DocsEditable()
+  int get pageYOffset => _blink.BlinkWindow.instance.pageYOffset_Getter_(this).round();
+
+  @DomName('Window.scrollX')
+  @DocsEditable()
+  int get scrollX => _blink.BlinkWindow.instance.scrollX_Getter_(this).round();
+
+  @DomName('Window.scrollY')
+  @DocsEditable()
+  int get scrollY => _blink.BlinkWindow.instance.scrollY_Getter_(this).round();
 $endif
 }
 
 $if DART2JS
 class _BeforeUnloadEvent extends _WrappedEvent implements BeforeUnloadEvent {
   String _returnValue;
 
   _BeforeUnloadEvent(Event base): super(base);
 
   String get returnValue => _returnValue;
@@ skipping 38 matching lines @@
 
   ElementStream<BeforeUnloadEvent> forElement(Element e, {bool useCapture: false}) {
     return new _ElementEventStreamImpl(e, _eventType, useCapture);
   }
 
   ElementStream<BeforeUnloadEvent> _forElementList(ElementList e,
       {bool useCapture: false}) {
     return new _ElementListEventStreamImpl(e, _eventType, useCapture);
   }
 }