CSS Typed OM: asMatrix for TransformComponent with LengthValue types

third_party/WebKit/Source/core/css/cssom/LengthValue.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 LengthValue_h
 #define LengthValue_h
 
 #include "core/css/cssom/StyleValue.h"
 
 namespace blink {
 
 class CalcDictionary;
 class ExceptionState;
 
 class CORE_EXPORT LengthValue : public StyleValue {
     WTF_MAKE_NONCOPYABLE(LengthValue);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static CSSPrimitiveValue::UnitType unitFromName(const String& name);
 
     LengthValue* add(const LengthValue* other, ExceptionState&);
     LengthValue* subtract(const LengthValue* other, ExceptionState&);
     LengthValue* multiply(double, ExceptionState&);
     LengthValue* divide(double, ExceptionState&);
 
+    double computeLengthPx(ExceptionState&) const;
+
     virtual bool containsPercent() const = 0;
+    virtual bool isRelative() const = 0;
 
     static LengthValue* parse(const String& cssString, ExceptionState&);
     static LengthValue* fromValue(double value, const String& typeStr, ExceptionState&);
     static LengthValue* fromDictionary(const CalcDictionary&, ExceptionState&);
 
 protected:
     LengthValue() {}
 
     virtual LengthValue* addInternal(const LengthValue* other, ExceptionState&);
     virtual LengthValue* subtractInternal(const LengthValue* other, ExceptionState&);
     virtual LengthValue* multiplyInternal(double, ExceptionState&);
     virtual LengthValue* divideInternal(double, ExceptionState&);
 
     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;
 };
 
 } // namespace blink
 
 #endif