Implement Element.scrollIntoView for scroll-behavior: smooth.

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h

 /*
  * Copyright (C) 2011 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 31 matching lines @@
 class CompositorAnimationHost;
 class CompositorAnimationTimeline;
 class LayoutBox;
 class LocalFrame;
 class FrameView;
 class GraphicsLayer;
 class Page;
 class PaintLayer;
 class Region;
 class ScrollableArea;
+class ProgrammaticScrollCoordinator;
 class WebLayerTreeView;
 class WebScrollbarLayer;
 
 class CORE_EXPORT ScrollingCoordinator final
     : public GarbageCollectedFinalized<ScrollingCoordinator> {
   WTF_MAKE_NONCOPYABLE(ScrollingCoordinator);
 
  public:
   static ScrollingCoordinator* create(Page*);
 
@@ skipping 65 matching lines @@
 
   void updateTouchEventTargetRectsIfNeeded();
 
   CompositorAnimationHost* compositorAnimationHost() {
     return m_animationHost.get();
   }
   CompositorAnimationTimeline* compositorAnimationTimeline() {
     return m_programmaticScrollAnimatorTimeline.get();
   }
 
+  ProgrammaticScrollCoordinator* programmaticScrollCoordinator();
+
   // For testing purposes only. This ScrollingCoordinator is reused between
   // layout test, and must be reset for the results to be valid.
   void reset();
 
  protected:
   explicit ScrollingCoordinator(Page*);
 
   bool isForRootLayer(ScrollableArea*) const;
   bool isForMainFrame(ScrollableArea*) const;
 
@@ skipping 32 matching lines @@
       m_programmaticScrollAnimatorTimeline;
 
   using ScrollbarMap =
       HeapHashMap<Member<ScrollableArea>, std::unique_ptr<WebScrollbarLayer>>;
   ScrollbarMap m_horizontalScrollbars;
   ScrollbarMap m_verticalScrollbars;
   HashSet<const PaintLayer*> m_layersWithTouchRects;
   bool m_wasFrameScrollable;
 
   MainThreadScrollingReasons m_lastMainThreadScrollingReasons;
+
+  Member<ProgrammaticScrollCoordinator> m_programmaticScrollCoordinator;

[bokan, 2017/02/21 21:33:01]

What should happen if two separate scrollable DIVs have an element get
scrollIntoView'd? I would expect them both to scroll simultaneously but having
this be a field on ScrollingCoordinator would mean they'd happen one after the
other, right? Perhaps this should be a member on ScrollableArea?

[sunyunjia, 2017/02/24 19:11:48]

Well, on a second thought, there might be conflict if we try to scroll the two
separate DIVs simultaneously. So I think they should happen one after the other
and the current design is good for now.

 };
 
 }  // namespace blink
 
 #endif  // ScrollingCoordinator_h