Add a runtime flag for the column-fill property.

Source/core/css/parser/CSSParserFastPaths.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/parser/CSSParserFastPaths.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSValuePool.h"
@@ skipping 290 matching lines @@
         return valueID == CSSValueClone || valueID == CSSValueSlice;
     case CSSPropertyWebkitBoxDirection:
         return valueID == CSSValueNormal || valueID == CSSValueReverse;
     case CSSPropertyWebkitBoxLines:
         return valueID == CSSValueSingle || valueID == CSSValueMultiple;
     case CSSPropertyWebkitBoxOrient:
         return valueID == CSSValueHorizontal || valueID == CSSValueVertical || valueID == CSSValueInlineAxis || valueID == CSSValueBlockAxis;
     case CSSPropertyWebkitBoxPack:
         return valueID == CSSValueStart || valueID == CSSValueEnd || valueID == CSSValueCenter || valueID == CSSValueJustify;
     case CSSPropertyColumnFill:
-        ASSERT(RuntimeEnabledFeatures::regionBasedColumnsEnabled());
+        ASSERT(RuntimeEnabledFeatures::columnFillEnabled());
         return valueID == CSSValueAuto || valueID == CSSValueBalance;
     case CSSPropertyAlignItems:
         // FIXME: Per CSS alignment, this property should accept the same arguments as 'justify-self' so we should share its parsing code.
         return valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueBaseline || valueID == CSSValueStretch;
     case CSSPropertyAlignSelf:
         // FIXME: Per CSS alignment, this property should accept the same arguments as 'justify-self' so we should share its parsing code.
         return valueID == CSSValueAuto || valueID == CSSValueFlexStart || valueID == CSSValueFlexEnd || valueID == CSSValueCenter || valueID == CSSValueBaseline || valueID == CSSValueStretch;
     case CSSPropertyFlexDirection:
         return valueID == CSSValueRow || valueID == CSSValueRowReverse || valueID == CSSValueColumn || valueID == CSSValueColumnReverse;
     case CSSPropertyFlexWrap:
@@ skipping 337 matching lines @@
     if (RefPtrWillBeRawPtr<CSSValue> color = parseColorValue(propertyID, string, parserMode))
         return color.release();
     if (RefPtrWillBeRawPtr<CSSValue> keyword = parseKeywordValue(propertyID, string))
         return keyword.release();
     if (RefPtrWillBeRawPtr<CSSValue> transform = parseSimpleTransform(propertyID, string))
         return transform.release();
     return nullptr;
 }
 
 } // namespace blink