Bindings for CSSOM View smooth scroll API

Source/core/frame/Window.idl

Index: Source/core/frame/Window.idl
diff --git a/Source/core/frame/Window.idl b/Source/core/frame/Window.idl
index 894ccf6ecea6a2e712612b35bc157d66d642ba0d..4f184de1bd8a3df3ddf761b96128d04695fb3610 100644
--- a/Source/core/frame/Window.idl
+++ b/Source/core/frame/Window.idl
@@ -93,9 +93,9 @@
     readonly attribute long pageXOffset;
     readonly attribute long pageYOffset;
 
-    void scrollBy(long x, long y);
-    void scrollTo(long x, long y);
-    void scroll(long x, long y);
+    [Custom] void scrollBy(long x, long y, Dictionary scrollOptions);
+    [Custom] void scrollTo(long x, long y, Dictionary scrollOptions);
+    [Custom] void scroll(long x, long y, Dictionary 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.