Implement support for the 'transform-box' property

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 3150 matching lines @@
       CSSValue* bottom =
           zoomAdjustedPixelValueOrAuto(style.clip().bottom(), style);
       CSSValue* left = zoomAdjustedPixelValueOrAuto(style.clip().left(), style);
       return CSSQuadValue::create(top, right, bottom, left,
                                   CSSQuadValue::SerializeAsRect);
     }
     case CSSPropertySpeak:
       return CSSIdentifierValue::create(style.speak());
     case CSSPropertyTransform:
       return computedTransform(layoutObject, style);
+    case CSSPropertyTransformBox:
+      return CSSIdentifierValue::create(style.transformBox());
     case CSSPropertyTransformOrigin: {
       CSSValueList* list = CSSValueList::createSpaceSeparated();
       if (layoutObject) {
         LayoutRect box;
         if (layoutObject->isBox())
           box = toLayoutBox(layoutObject)->borderBoxRect();
 
         list->append(*zoomAdjustedPixelValue(
             minimumValueForLength(style.transformOriginX(), box.width()),
             style));
@@ skipping 520 matching lines @@
     case CSSPropertyAll:
       return nullptr;
     default:
       break;
   }
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace blink