First Implementation of Snapped Points

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

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index 74399810894c268ca34a0c972377f3ccf0576130..a597edf0521b6f30ac7304e6f87c20558b2c6849 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -451,20 +451,28 @@ void LayoutBox::UpdateScrollSnapMappingAfterStyleChange(
       GetNode() != GetDocument().ViewportDefiningElement();
 
   ScrollSnapType old_snap_type =
-      old_style ? old_style->GetScrollSnapType() : kScrollSnapTypeNone;
+      old_style ? old_style->GetScrollSnapType() : ScrollSnapType();
   ScrollSnapType new_snap_type = new_style && allows_snap_container
                                      ? new_style->GetScrollSnapType()
-                                     : kScrollSnapTypeNone;
+                                     : ScrollSnapType();
   if (old_snap_type != new_snap_type)
     snap_coordinator->SnapContainerDidChange(*this, new_snap_type);
 
-  Vector<LengthPoint> empty_vector;
+  /*Vector<LengthPoint> empty_vector;
   const Vector<LengthPoint>& old_snap_coordinate =
       old_style ? old_style->ScrollSnapCoordinate() : empty_vector;
   const Vector<LengthPoint>& new_snap_coordinate =
       new_style ? new_style->ScrollSnapCoordinate() : empty_vector;
   if (old_snap_coordinate != new_snap_coordinate)
-    snap_coordinator->SnapAreaDidChange(*this, new_snap_coordinate);
+    snap_coordinator->SnapAreaDidChange(*this, new_snap_coordinate);*/
+
+  ScrollSnapAlign old_snap_align =
+      old_style ? old_style->GetScrollSnapAlign() : ScrollSnapAlign();
+  ScrollSnapAlign new_snap_align = new_style && allows_snap_container
+                                       ? new_style->GetScrollSnapAlign()
+                                       : ScrollSnapAlign();
+  if (old_snap_align != new_snap_align)
+    snap_coordinator->SnapAreaDidChange(*this, new_snap_align);
 }
 
 void LayoutBox::AddScrollSnapMapping() {