Update Window API for CSSOM smooth scrolling to match the spec

Source/core/frame/Window.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 77 matching lines @@
     [Replaceable] readonly attribute long innerWidth;
     [Replaceable] readonly attribute long screenX;
     [Replaceable] readonly attribute long screenY;
     [Replaceable] readonly attribute long screenLeft;
     [Replaceable] readonly attribute long screenTop;
     [Replaceable] readonly attribute double scrollX;
     [Replaceable] readonly attribute double scrollY;
     readonly attribute double pageXOffset;
     readonly attribute double pageYOffset;
 
-    // Overloading can be replaced by optional if RuntimeEnabled is removed, by
-    // changing the third argument to *optional* Dictionary scrollOptions
     void scrollBy(double x, double y);
-    [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scrollBy(double x, double y, ScrollOptions scrollOptions);
+    [RuntimeEnabled=CSSOMSmoothScroll] void scrollBy([Default=Undefined] optional ScrollToOptions scrollToOptions);
     void scrollTo(double x, double y);
-    [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scrollTo(double x, double y, ScrollOptions scrollOptions);
+    [RuntimeEnabled=CSSOMSmoothScroll] void scrollTo([Default=Undefined] optional ScrollToOptions scrollToOptions);
     void scroll(double x, double y);
-    [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scroll(double x, double y, ScrollOptions scrollOptions);
+    [RuntimeEnabled=CSSOMSmoothScroll] void scroll([Default=Undefined] optional ScrollToOptions scrollOptions);
     void moveBy([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
     void moveTo([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
     void resizeBy([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
     void resizeTo([Default=Undefined] optional float width, [Default=Undefined] optional float height); // FIXME: this should take longs not floats.
 
     [DoNotCheckSecurity] readonly attribute boolean closed;
 
     [Replaceable, DoNotCheckSecurity] readonly attribute unsigned long length;
 
     attribute DOMString name;
@@ skipping 100 matching lines @@
 // FIXME: make this typedef accurate once enough of http://crbug.com/240176
 // is in place.
 // FIXME: consider putting this typedef in an .idl file containing spec-wide
 // utility type definitions.
 typedef MessagePort Transferable;
 
 Window implements GlobalEventHandlers;
 Window implements WindowBase64;
 Window implements WindowEventHandlers;
 Window implements WindowTimers;