[WIP] Add support for CSSValue-> CSSLengthValue and CSSTranslation

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

 // Copyright 2015 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 CSSLengthValue_h
 #define CSSLengthValue_h
 
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/cssom/CSSStyleValue.h"
 
 namespace blink {
 
 class CalcDictionary;
 class ExceptionState;
 
 class CORE_EXPORT CSSLengthValue : public CSSStyleValue {
     WTF_MAKE_NONCOPYABLE(CSSLengthValue);
     DEFINE_WRAPPERTYPEINFO();
 public:
+    static CSSLengthValue* fromCSSValue(const CSSValue& value);
     static CSSPrimitiveValue::UnitType unitFromName(const String& name);
 
     CSSLengthValue* add(const CSSLengthValue* other, ExceptionState&);
     CSSLengthValue* subtract(const CSSLengthValue* other, ExceptionState&);
     CSSLengthValue* multiply(double, ExceptionState&);
     CSSLengthValue* divide(double, ExceptionState&);
 
     virtual bool containsPercent() const = 0;
 
     static CSSLengthValue* from(const String& cssString, ExceptionState&);
     static CSSLengthValue* from(double value, const String& typeStr, ExceptionState&);
     static CSSLengthValue* from(const CalcDictionary&, ExceptionState&);
 
 protected:
     CSSLengthValue() {}
 
     virtual CSSLengthValue* addInternal(const CSSLengthValue* other, ExceptionState&);
     virtual CSSLengthValue* subtractInternal(const CSSLengthValue* other, ExceptionState&);
-    virtual CSSLengthValue* multiplyInternal(double, ExceptionState&);
-    virtual CSSLengthValue* divideInternal(double, ExceptionState&);
+    virtual CSSLengthValue* multiplyInternal(double);
+    virtual CSSLengthValue* divideInternal(double);
 
     static bool isSupportedLengthUnit(CSSPrimitiveValue::UnitType unit)
     {
         return (CSSPrimitiveValue::isLength(unit) || unit == CSSPrimitiveValue::UnitType::Percentage)
             && unit != CSSPrimitiveValue::UnitType::QuirkyEms
             && unit != CSSPrimitiveValue::UnitType::UserUnits;
     }
 
     static const int kNumSupportedUnits = 15;
 };
 
 DEFINE_TYPE_CASTS(CSSLengthValue, CSSStyleValue, value,
     (value->type() == CSSStyleValue::SimpleLengthType
         || value->type() == CSSStyleValue::CalcLengthType),
     (value.type() == CSSStyleValue::SimpleLengthType
         || value.type() == CSSStyleValue::CalcLengthType));
 
 } // namespace blink
 
 #endif