Scroll Customization Prototype (Not for review, WIP)

Source/core/testing/Internals.h

Index: Source/core/testing/Internals.h
diff --git a/Source/core/testing/Internals.h b/Source/core/testing/Internals.h
index 028aef0aee82248560015a7406360affae8bb466..229a3161e647eb955daf74d7a3822fb3db5a103d 100644
--- a/Source/core/testing/Internals.h
+++ b/Source/core/testing/Internals.h
@@ -336,6 +336,8 @@ public:
     void forcePluginPlaceholder(HTMLElement* plugin, PassRefPtrWillBeRawPtr<DocumentFragment>, ExceptionState&);
     void forcePluginPlaceholder(HTMLElement* plugin, const PluginPlaceholderOptions&, ExceptionState&);
 
+    void setScrollChain(ScrollState*, const Vector<RefPtr<Element>>& elements, ExceptionState&);
+
     // Scheudle a forced Blink GC run (Oilpan) at the end of event loop.
     // Note: This is designed to be only used from PerformanceTests/BlinkGC to explicitly measure only Blink GC time.
     //       Normal LayoutTests should use gc() instead as it would trigger both Blink GC and V8 GC.