Add additive animation support for CSS property translate

third_party/WebKit/Source/platform/Length.h

 /*
     Copyright (C) 1999 Lars Knoll (knoll@kde.org)
     Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
     Copyright (C) 2011 Rik Cabanier (cabanier@adobe.com)
     Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
 
     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 141 matching lines @@
 
     int intValue() const
     {
         if (isCalculated()) {
             ASSERT_NOT_REACHED();
             return 0;
         }
         return getIntValue();
     }
 
+    float pixels() const
+    {
+        ASSERT(type() == Fixed);
+        return getFloatValue();
+    }
+
     float percent() const
     {
         ASSERT(type() == Percent);
         return getFloatValue();
     }
+
     PixelsAndPercent pixelsAndPercent() const;
 
     CalculationValue& calculationValue() const;
 
     LengthType type() const { return static_cast<LengthType>(m_type); }
     bool quirk() const { return m_quirk; }
 
     void setQuirk(bool quirk)
     {
         m_quirk = quirk;
@@ skipping 143 matching lines @@
     bool m_quirk;
     unsigned char m_type;
     bool m_isFloat;
 };
 
 PLATFORM_EXPORT Vector<Length> parseHTMLAreaElementCoords(const String&);
 
 } // namespace blink
 
 #endif // Length_h