Add fromCSSValue methods to LengthValue subclasses, remove extra method in CSSSimpleLength.

third_party/WebKit/Source/core/css/cssom/CSSCalcLength.h

 // Copyright 2016 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.
 
 #ifndef CSSCalcLength_h
 #define CSSCalcLength_h
 
 #include "core/css/cssom/CSSLengthValue.h"
 #include "wtf/BitVector.h"
 
 namespace blink {
 
 class CSSCalcDictionary;
 class CSSSimpleLength;
 
 class CORE_EXPORT CSSCalcLength final : public CSSLengthValue {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static CSSCalcLength* create(const CSSLengthValue*);
     static CSSCalcLength* create(const CSSCalcDictionary&, ExceptionState&);
     static CSSCalcLength* create(const CSSLengthValue* length, ExceptionState&)
     {
         return create(length);
     }
+    static CSSCalcLength* fromCSSValue(const CSSPrimitiveValue&);
 
 #define GETTER_MACRO(name, type) \
     double name(bool& isNull) \
     { \
         isNull = !hasAtIndex(indexForUnit(type)); \
         return get(type); \
     }
 
     GETTER_MACRO(px, CSSPrimitiveValue::UnitType::Pixels)
     GETTER_MACRO(percent, CSSPrimitiveValue::UnitType::Percentage)
@@ skipping 64 matching lines @@
 #define DEFINE_CALC_LENGTH_TYPE_CASTS(argumentType) \
     DEFINE_TYPE_CASTS(CSSCalcLength, argumentType, value, \
         value->type() == CSSLengthValue::StyleValueType::CalcLengthType, \
         value.type() == CSSLengthValue::StyleValueType::CalcLengthType)
 
 DEFINE_CALC_LENGTH_TYPE_CASTS(CSSStyleValue);
 
 } // namespace blink
 
 #endif