Add CSS support for Containment

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
  * modify it under the terms of the GNU Lesser General Public
@@ skipping 2661 matching lines @@
             return cssValuePool().createValue(1, CSSPrimitiveValue::UnitType::Number);
         RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
         list->append(cssValuePool().createValue(style.scale()->x(), CSSPrimitiveValue::UnitType::Number));
         if (style.scale()->y() == 1 && style.scale()->z() == 1)
             return list.release();
         list->append(cssValuePool().createValue(style.scale()->y(), CSSPrimitiveValue::UnitType::Number));
         if (style.scale()->z() != 1)
             list->append(cssValuePool().createValue(style.scale()->z(), CSSPrimitiveValue::UnitType::Number));
         return list.release();
     }
+    case CSSPropertyContain:
+        return cssValuePool().createValue(style.contain());
     case CSSPropertyVariable:
         // TODO(leviw): We should have a way to retrive variables here.
         ASSERT_NOT_REACHED();
         return nullptr;
     case CSSPropertyAll:
         return nullptr;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 }