Implement CSSOM smooth scroll for Elements

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 788 matching lines @@
         return;
 
     ScrollBehavior scrollBehavior = ScrollBehaviorAuto;
     ScrollableArea::scrollBehaviorFromString(scrollToOptions.behavior(), scrollBehavior);
     RenderBox* rend = renderBox();
     if (rend) {
         double currentScaledLeft = rend->scrollLeft();
         double currentScaledTop = rend->scrollTop();
         double newScaledLeft = left * rend->style()->effectiveZoom() + currentScaledLeft;
         double newScaledTop = top * rend->style()->effectiveZoom() + currentScaledTop;
-        // FIXME: Use scrollBehavior to decide whether to scroll smoothly or instantly.
-        rend->scrollToOffset(DoubleSize(newScaledLeft, newScaledTop));
+        rend->scrollToOffset(DoubleSize(newScaledLeft, newScaledTop), scrollBehavior);
     }
 }
 
 void Element::scrollRenderBoxTo(const ScrollToOptions& scrollToOptions)
 {
     if ((scrollToOptions.hasLeft() && std::isnan(scrollToOptions.left()))
         || (scrollToOptions.hasTop() && std::isnan(scrollToOptions.top())))
         return;
 
     ScrollBehavior scrollBehavior = ScrollBehaviorAuto;
     ScrollableArea::scrollBehaviorFromString(scrollToOptions.behavior(), scrollBehavior);
 
     RenderBox* rend = renderBox();
     if (rend) {
         double scaledLeft = rend->scrollLeft();
         double scaledTop = rend->scrollTop();
         if (scrollToOptions.hasLeft())
             scaledLeft = scrollToOptions.left() * rend->style()->effectiveZoom();
         if (scrollToOptions.hasTop())
             scaledTop = scrollToOptions.top() * rend->style()->effectiveZoom();
-        // FIXME: Use scrollBehavior to decide whether to scroll smoothly or instantly.
-        rend->scrollToOffset(DoubleSize(scaledLeft, scaledTop));
+        rend->scrollToOffset(DoubleSize(scaledLeft, scaledTop), scrollBehavior);
     }
 }
 
 void Element::scrollFrameBy(const ScrollToOptions& scrollToOptions)
 {
     double left = scrollToOptions.hasLeft() ? scrollToOptions.left() : 0.0;
     double top = scrollToOptions.hasTop() ? scrollToOptions.top() : 0.0;
     if (std::isnan(left) || std::isnan(top))
         return;
 
@@ skipping 2563 matching lines @@
         return wrapper;
 
     CustomElementBinding* binding = perContextData->customElementBinding(customElementDefinition());
 
     wrapper->SetPrototype(binding->prototype());
 
     return V8DOMWrapper::associateObjectWithWrapper(isolate, this, wrapperType, wrapper);
 }
 
 } // namespace blink