Implement Element.scrollIntoView for scroll-behavior: smooth.

third_party/WebKit/Source/core/dom/Element.h

 /*
  * 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)
  * Copyright (C) 2003-2011, 2013, 2014 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 47 matching lines @@
 class Image;
 class InputDeviceCapabilities;
 class Locale;
 class MutableStylePropertySet;
 class NamedNodeMap;
 class ElementIntersectionObserverData;
 class PseudoElement;
 class PseudoStyleRequest;
 class ResizeObservation;
 class ResizeObserver;
+class ScrollIntoViewOptions;
+class ScrollIntoViewOptionsOrBoolean;
 class ScrollState;
 class ScrollStateCallback;
 class ScrollToOptions;
 class ShadowRoot;
 class ShadowRootInit;
 class StylePropertySet;
 class StylePropertyMap;
 class V0CustomElementDefinition;
 
 enum SpellcheckAttributeState {
@@ skipping 142 matching lines @@
   // This getter takes care of synchronizing all attributes before returning the
   // AttributeCollection. If the Element has no attributes, an empty
   // AttributeCollection will be returned. This is not a trivial getter and its
   // return value should be cached for performance.
   AttributeCollection Attributes() const;
   // This variant will not update the potentially invalid attributes. To be used
   // when not interested in style attribute or one of the SVG animation
   // attributes.
   AttributeCollection AttributesWithoutUpdate() const;
 
+  void scrollIntoView(ScrollIntoViewOptionsOrBoolean);
   void scrollIntoView(bool align_to_top = true);
+  void scrollIntoViewWithOptions(const ScrollIntoViewOptions&);
   void scrollIntoViewIfNeeded(bool center_if_needed = true);
 
   int OffsetLeft();
   int OffsetTop();
   int OffsetWidth();
   int OffsetHeight();
 
   Element* OffsetParent();
   int clientLeft();
   int clientTop();
@@ skipping 998 matching lines @@
 #define DECLARE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
   static T* Create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T)                     \
   T* T::Create(const QualifiedName& tagName, Document& document) { \
     return new T(tagName, document);                               \
   }
 
 }  // namespace blink
 
 #endif  // Element_h