[CSS Typed OM] Implement CSSUnit::to for fixed length types

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

 // Copyright 2017 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 CSSUnitValue_h
 #define CSSUnitValue_h
 
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/cssom/CSSNumericValue.h"
 
@@ skipping 34 matching lines @@
   bool ContainsPercent() const final {
     return unit_ == CSSPrimitiveValue::UnitType::kPercentage;
   }
   const CSSValue* ToCSSValue() const final;
 
  private:
 
   CSSUnitValue(double value, CSSPrimitiveValue::UnitType unit)
       : CSSNumericValue(), value_(value), unit_(unit) {}
 
+  double ConvertFixedLength(CSSPrimitiveValue::UnitType) const;
   double ConvertAngle(CSSPrimitiveValue::UnitType) const;
 
   double value_;
   CSSPrimitiveValue::UnitType unit_;
 };
 
 DEFINE_TYPE_CASTS(CSSUnitValue,
                   CSSNumericValue,
                   value,
                   !value->IsCalculated(),
                   !value.IsCalculated());
 
 }  // namespace blink
 
 #endif  // CSSUnitValue_h