Implement CSS: scroll-boundary-behavior

third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 3643 matching lines @@
       return CSSIdentifierValue::Create(style.GetScrollSnapType());
     case CSSPropertyScrollSnapPointsX:
       return ValueForScrollSnapPoints(style.ScrollSnapPointsX(), style);
     case CSSPropertyScrollSnapPointsY:
       return ValueForScrollSnapPoints(style.ScrollSnapPointsY(), style);
     case CSSPropertyScrollSnapCoordinate:
       return ValueForScrollSnapCoordinate(style.ScrollSnapCoordinate(), style);
     case CSSPropertyScrollSnapDestination:
       return ValueForScrollSnapDestination(style.ScrollSnapDestination(),
                                            style);
+    case CSSPropertyScrollBoundaryBehavior:
+      if (style.ScrollBoundaryBehaviorX() == style.ScrollBoundaryBehaviorY())
+        return CSSIdentifierValue::Create(style.ScrollBoundaryBehaviorX());
+      return nullptr;
+    case CSSPropertyScrollBoundaryBehaviorX:
+      return CSSIdentifierValue::Create(style.ScrollBoundaryBehaviorX());
+    case CSSPropertyScrollBoundaryBehaviorY:
+      return CSSIdentifierValue::Create(style.ScrollBoundaryBehaviorY());
     case CSSPropertyTranslate: {
       if (!style.Translate())
         return CSSIdentifierValue::Create(CSSValueNone);
 
       CSSValueList* list = CSSValueList::CreateSpaceSeparated();
       if (layout_object && layout_object->IsBox()) {
         LayoutRect box = ToLayoutBox(layout_object)->BorderBoxRect();
         list->Append(*ZoomAdjustedPixelValue(
             FloatValueForLength(style.Translate()->X(), box.Width().ToFloat()),
             style));
@@ skipping 79 matching lines @@
     case CSSPropertyAll:
       return nullptr;
     default:
       break;
   }
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace blink