Expose scroll customization for touch to JS (behind REF).

Source/core/dom/ElementRareData.cpp

Index: Source/core/dom/ElementRareData.cpp
diff --git a/Source/core/dom/ElementRareData.cpp b/Source/core/dom/ElementRareData.cpp
index 08934494c16d767e836bef33f315ebc46ac14930..959f073307dcd4b33abafa5c459982d033755dcd 100644
--- a/Source/core/dom/ElementRareData.cpp
+++ b/Source/core/dom/ElementRareData.cpp
@@ -40,6 +40,7 @@ struct SameSizeAsElementRareData : NodeRareData {
     LayoutSize sizeForResizing;
     IntSize scrollOffset;
     void* pointers[13];
+    PersistentWillBeMember<Element> persistentWillBeMember[2];
 };
 
 CSSStyleDeclaration& ElementRareData::ensureInlineCSSStyleDeclaration(Element* ownerElement)
@@ -72,6 +73,8 @@ DEFINE_TRACE_AFTER_DISPATCH(ElementRareData)
     visitor->trace(m_generatedAfter);
     visitor->trace(m_generatedFirstLetter);
     visitor->trace(m_backdrop);
+    visitor->trace(m_applyScroll);
+    visitor->trace(m_distributeScroll);
     NodeRareData::traceAfterDispatch(visitor);
 }