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..673fa74a6f702a576fb4a9bbe555530f52e2f01f 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 +122,20 @@ public:
     void setCustomElementDefinition(PassRefPtrWillBeRawPtr<CustomElementDefinition> definition) { m_customElementDefinition = definition; }
     CustomElementDefinition* customElementDefinition() const { return m_customElementDefinition.get(); }
 
+    void setDistributeScroll(PassRefPtrWillBeRawPtr<ScrollStateCallback> scrollStateCallback)
+    {
+        m_distributeScroll = scrollStateCallback;
+    }
+
+    ScrollStateCallback* getDistributeScroll() { return m_distributeScroll.get(); }
+
+    void setApplyScroll(PassRefPtrWillBeRawPtr<ScrollStateCallback> scrollStateCallback)
+    {
+        m_applyScroll = scrollStateCallback;
+    }
+
+    ScrollStateCallback* getApplyScroll() { return m_applyScroll.get(); }
+
     AttrNodeList& ensureAttrNodeList();
     AttrNodeList* attrNodeList() { return m_attrNodeList.get(); }
     void removeAttrNodeList() { m_attrNodeList.clear(); }
@@ -152,6 +167,9 @@ private:
     RefPtrWillBeMember<PseudoElement> m_generatedFirstLetter;
     RefPtrWillBeMember<PseudoElement> m_backdrop;
 
+    RefPtrWillBeMember<ScrollStateCallback> m_applyScroll;
+    RefPtrWillBeMember<ScrollStateCallback> m_distributeScroll;

[haraken, 2015/06/27 08:09:33]

You can make Oilpan the default for ScrollStateCallback and use
PersistentWillBeMember.

[tdresser, 2015/06/29 20:59:33]

Thanks, I'd tried that earlier, but had been missing the behavior of Persistent.

+
     explicit ElementRareData(LayoutObject*);
 };