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

Source/core/dom/ElementRareData.h

Index: Source/core/dom/ElementRareData.h
diff --git a/Source/core/dom/ElementRareData.h b/Source/core/dom/ElementRareData.h
index bcd739cf05d7d796782502e1998914bdb2390157..8f215d553a24564a6f81be8d38bfa5536397128c 100644
--- a/Source/core/dom/ElementRareData.h
+++ b/Source/core/dom/ElementRareData.h
@@ -31,6 +31,7 @@
 #include "core/dom/custom/CustomElementDefinition.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/html/ClassList.h"
+#include "core/page/scrolling/ScrollStateCallback.h"
 #include "core/style/StyleInheritedData.h"
 #include "platform/heap/Handle.h"
 #include "wtf/OwnPtr.h"
@@ -121,6 +122,14 @@ public:
     void setCustomElementDefinition(PassRefPtrWillBeRawPtr<CustomElementDefinition> definition) { m_customElementDefinition = definition; }
     CustomElementDefinition* customElementDefinition() const { return m_customElementDefinition.get(); }
 
+    void setDistributeScroll(ScrollStateCallback* scrollStateCallback) { m_distributeScroll = scrollStateCallback; }
+
+    ScrollStateCallback* getDistributeScroll() { return m_distributeScroll.get(); }

[haraken, 2015/06/30 07:08:30]

Nit: Blink normally doesn't use a "get" prefix.

+
+    void setApplyScroll(ScrollStateCallback* scrollStateCallback) { m_applyScroll = scrollStateCallback; }
+
+    ScrollStateCallback* getApplyScroll() { return m_applyScroll.get(); }

[haraken, 2015/06/30 07:08:30]

Ditto.

+
     AttrNodeList& ensureAttrNodeList();
     AttrNodeList* attrNodeList() { return m_attrNodeList.get(); }
     void removeAttrNodeList() { m_attrNodeList.clear(); }
@@ -152,6 +161,9 @@ private:
     RefPtrWillBeMember<PseudoElement> m_generatedFirstLetter;
     RefPtrWillBeMember<PseudoElement> m_backdrop;
 
+    PersistentWillBeMember<ScrollStateCallback> m_applyScroll;
+    PersistentWillBeMember<ScrollStateCallback> m_distributeScroll;
+
     explicit ElementRareData(LayoutObject*);
 };