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

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 97 matching lines @@
 #include "core/layout/LayoutView.h"
 #include "core/layout/compositing/CompositedDeprecatedPaintLayerMapping.h"
 #include "core/layout/compositing/DeprecatedPaintLayerCompositor.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/HistoryItem.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/FocusController.h"
 #include "core/page/NetworkStateNotifier.h"
 #include "core/page/Page.h"
 #include "core/page/PrintContext.h"
+#include "core/page/scrolling/ScrollState.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "core/plugins/testing/DictionaryPluginPlaceholder.h"
 #include "core/plugins/testing/DocumentFragmentPluginPlaceholder.h"
 #include "core/svg/SVGImageElement.h"
 #include "core/testing/DictionaryTest.h"
 #include "core/testing/GCObservation.h"
 #include "core/testing/InternalRuntimeFlags.h"
 #include "core/testing/InternalSettings.h"
 #include "core/testing/LayerRect.h"
 #include "core/testing/LayerRectList.h"
@@ skipping 2271 matching lines @@
 
 void Internals::forcePluginPlaceholder(HTMLElement* element, const PluginPlaceholderOptions& options, ExceptionState& exceptionState)
 {
     if (!element->isPluginElement()) {
         exceptionState.throwDOMException(InvalidNodeTypeError, "The element provided is not a plugin.");
         return;
     }
     toHTMLPlugInElement(element)->setPlaceholder(DictionaryPluginPlaceholder::create(element->document(), options));
 }
 
+void Internals::setScrollChain(
+    ScrollState* scrollState, const WillBeHeapVector<RefPtrWillBeMember<Element>>& elements, ExceptionState&)
+{
+    WillBeHeapDeque<RefPtrWillBeMember<Element>> scrollChain;
+    for (size_t i = 0; i < elements.size(); ++i)
+        scrollChain.append(elements[i]);
+    scrollState->setScrollChain(scrollChain);
+}
+
 void Internals::forceBlinkGCWithoutV8GC()
 {
     ThreadState::current()->setGCState(ThreadState::FullGCScheduled);
 }
 
 String Internals::selectedHTMLForClipboard()
 {
     return frame()->selection().selectedHTMLForClipboard();
 }
 
@@ skipping 60 matching lines @@
 
     return animator->setScrollbarsVisibleForTesting(visible);
 }
 
 void Internals::forceRestrictIFramePermissions()
 {
     RuntimeEnabledFeatures::setRestrictIFramePermissionsEnabled(true);
 }
 
 } // namespace blink