Use scroll customization primitives for touch scrolling (behind REF).

Source/core/dom/Element.h

Index: Source/core/dom/Element.h
diff --git a/Source/core/dom/Element.h b/Source/core/dom/Element.h
index f442b38cf38dc31a75d8ada14734e6f68db352c9..12e75ca59f24e853c7785874c79f090665661dac 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -60,6 +60,7 @@ class Locale;
 class MutableStylePropertySet;
 class PropertySetCSSStyleDeclaration;
 class PseudoElement;
+class ScrollState;
 class ScrollToOptions;
 class ShadowRoot;
 class StylePropertySet;
@@ -166,6 +167,9 @@ public:
     void scrollIntoView(bool alignToTop = true);
     void scrollIntoViewIfNeeded(bool centerIfNeeded = true);
 
+    void distributeScroll(ScrollState*);
+    void applyScroll(ScrollState*);
+
     int offsetLeft();
     int offsetTop();
     int offsetWidth();