Update CSSOM SmoothScroll Web Platform Test

third_party/WebKit/Source/core/dom/Element.idl

Index: third_party/WebKit/Source/core/dom/Element.idl
diff --git a/third_party/WebKit/Source/core/dom/Element.idl b/third_party/WebKit/Source/core/dom/Element.idl
index f642b455026e80b37cbe48f0996bc713172f60e2..c0bbbc92c68cd58e260a364447a2f2eee8447558 100644
--- a/third_party/WebKit/Source/core/dom/Element.idl
+++ b/third_party/WebKit/Source/core/dom/Element.idl
@@ -95,7 +95,7 @@ interface Element : Node {
     ClientRectList getClientRects();
     ClientRect getBoundingClientRect();
 
-    void scrollIntoView(optional (ScrollIntoViewOptions or boolean)? arg);
+    void scrollIntoView(optional (ScrollIntoViewOptions or boolean) arg);

[foolip, 2017/06/16 08:20:33]

Per https://github.com/w3c/csswg-drafts/pull/1505 it should also have the
default value true. Then you should be able to have just one signature in the
C++ as well, the generated bindings should always call with a
ScrollIntoViewOptions argument.

     [RuntimeEnabled=CSSOMSmoothScroll, ImplementedAs=scrollTo] void scroll(optional ScrollToOptions options);
     [RuntimeEnabled=CSSOMSmoothScroll, ImplementedAs=scrollTo] void scroll(unrestricted double x, unrestricted double y);
     [RuntimeEnabled=CSSOMSmoothScroll] void scrollTo(optional ScrollToOptions options);