Fix crash when animating -webkit-{min,max}-content keyword

Source/core/css/resolver/StyleBuilderConverter.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 539 matching lines @@
 Length StyleBuilderConverter::convertLengthSizing(StyleResolverState& state, CSSValue* value)
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     switch (primitiveValue->getValueID()) {
     case CSSValueInvalid:
         return convertLength(state, value);
     case CSSValueIntrinsic:
         return Length(Intrinsic);
     case CSSValueMinIntrinsic:
         return Length(MinIntrinsic);
+    case CSSValueMinContent:
     case CSSValueWebkitMinContent:
         return Length(MinContent);
+    case CSSValueMaxContent:
     case CSSValueWebkitMaxContent:
         return Length(MaxContent);
     case CSSValueWebkitFillAvailable:
         return Length(FillAvailable);
     case CSSValueWebkitFitContent:
         return Length(FitContent);
     case CSSValueAuto:
         return Length(Auto);
     default:
         ASSERT_NOT_REACHED();
@@ skipping 323 matching lines @@
     CSSPrimitiveValue* primitiveValueZ = toCSSPrimitiveValue(list->item(2));
 
     return TransformOrigin(
         convertOriginLength<CSSValueLeft, CSSValueRight>(state, primitiveValueX),
         convertOriginLength<CSSValueTop, CSSValueBottom>(state, primitiveValueY),
         StyleBuilderConverter::convertComputedLength<float>(state, primitiveValueZ)
     );
 }
 
 } // namespace blink