Support animating <resolution> custom properties

third_party/WebKit/Source/core/css/CSSPrimitiveValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 215 matching lines @@
   static CSSPrimitiveValue* Create(T value) {
     return new CSSPrimitiveValue(value);
   }
 
   ~CSSPrimitiveValue();
 
   UnitType TypeWithCalcResolved() const;
 
   double ComputeDegrees() const;
   double ComputeSeconds() const;
+  double ComputeDotsPerPixel() const;
 
   // Computes a length in pixels, resolving relative lengths
   template <typename T>
   T ComputeLength(const CSSToLengthConversionData&) const;
 
   // Converts to a Length (Fixed, Percent or Calculated)
   Length ConvertToLength(const CSSToLengthConversionData&) const;
 
   double GetDoubleValue() const;
   float GetFloatValue() const { return GetValue<float>(); }
@@ skipping 89 matching lines @@
 short CSSPrimitiveValue::ComputeLength(const CSSToLengthConversionData&) const;
 
 template <>
 float CSSPrimitiveValue::ComputeLength(const CSSToLengthConversionData&) const;
 
 template <>
 double CSSPrimitiveValue::ComputeLength(const CSSToLengthConversionData&) const;
 }  // namespace blink
 
 #endif  // CSSPrimitiveValue_h