Implementing document.setRootScroller API for main thread scrolling.

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

Index: third_party/WebKit/Source/core/dom/Document.idl
diff --git a/third_party/WebKit/Source/core/dom/Document.idl b/third_party/WebKit/Source/core/dom/Document.idl
index a5422d5bfb935262c2cac0e5cf2b6bfafba274da..0553695570180fc3664fad96d012dfd4d89e43f1 100644
--- a/third_party/WebKit/Source/core/dom/Document.idl
+++ b/third_party/WebKit/Source/core/dom/Document.idl
@@ -73,6 +73,10 @@ interface Document : Node {
     [NewObject] NodeIterator createNodeIterator(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
     [NewObject] TreeWalker createTreeWalker(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null);
 
+    // NonDocumentRootScroller (https://github.com/bokand/NonDocumentRootScroller)
+    [RuntimeEnabled=SetRootScroller, RaisesException] void setRootScroller (Element element);

[esprehn, 2016/05/05 17:20:19]

This doesn't match web platform conventions. The web doesn't use setFoo methods,
it uses setter properties. This API needs a review.

[bokan, 2016/05/05 21:19:48]

Acknowledged.

+    [RuntimeEnabled=SetRootScroller] readonly attribute Element? rootScroller;
+
     // FIXME: CDATASection has been removed from the spec. crbug.com/437205
     [RaisesException, MeasureAs=DocumentCreateCDATASection] CDATASection createCDATASection(DOMString data);