Update the snap points css properties

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SnapCoordinator_h
 #define SnapCoordinator_h
 
 #include "core/CoreExport.h"
 #include "core/css/CSSPrimitiveValueMappings.h"
 #include "platform/heap/Handle.h"
 #include "platform/wtf/Vector.h"
 
 namespace blink {
 
-class ContainerNode;
 class LayoutBox;
-struct LengthPoint;
+struct ScrollSnapType;
+struct ScrollSnapAlign;
 
 // Snap Coordinator keeps track of snap containers and all of their associated
 // snap areas. It also contains the logic to generate the list of valid snap
 // positions for a given snap container.
 //
 // Snap container:
 //   An scroll container that has 'scroll-snap-type' value other
 //   than 'none'.
 // Snap area:
 //   A snap container's descendant that contributes snap positions. An element
 //   only contributes snap positions to its nearest ancestor (on the element’s
 //   containing block chain) scroll container.
 //
 // For more information see spec: https://drafts.csswg.org/css-snappoints/
 class CORE_EXPORT SnapCoordinator final
     : public GarbageCollectedFinalized<SnapCoordinator> {
   WTF_MAKE_NONCOPYABLE(SnapCoordinator);
 
  public:
   static SnapCoordinator* Create();
   ~SnapCoordinator();
   DEFINE_INLINE_TRACE() {}
 
   void SnapContainerDidChange(LayoutBox&, ScrollSnapType);
-  void SnapAreaDidChange(LayoutBox&,
-                         const Vector<LengthPoint>& snap_coordinates);
+  void SnapAreaDidChange(LayoutBox&, ScrollSnapAlign);
 
 #ifndef NDEBUG
   void ShowSnapAreaMap();
   void ShowSnapAreasFor(const LayoutBox*);
 #endif
 
  private:
   friend class SnapCoordinatorTest;
   explicit SnapCoordinator();
 
-  Vector<double> SnapOffsets(const ContainerNode&, ScrollbarOrientation);
-
   HashSet<const LayoutBox*> snap_containers_;
 };
 
 }  // namespace blink
 
 #endif  // SnapCoordinator_h