Implement Element.scrollIntoView for scroll-behavior: smooth.

third_party/WebKit/Source/core/layout/LayoutListBox.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved.
  *                    (http://www.torchmobile.com/)
  *
  * 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
@@ skipping 115 matching lines @@
   if (Style()->Width().IsPercentOrCalc())
     min_logical_width = LayoutUnit();
 }
 
 void LayoutListBox::ScrollToRect(const LayoutRect& rect) {
   if (HasOverflowClip()) {
     DCHECK(Layer());
     DCHECK(Layer()->GetScrollableArea());
     Layer()->GetScrollableArea()->ScrollIntoView(
         rect, ScrollAlignment::kAlignToEdgeIfNeeded,
-        ScrollAlignment::kAlignToEdgeIfNeeded);
+        ScrollAlignment::kAlignToEdgeIfNeeded, false);
   }
 }
 
 }  // namespace blink