Animation: Fix loss of type information when interpolating value of 0

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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef CSSPrimitiveValue_h
 #define CSSPrimitiveValue_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/CSSValueKeywords.h"
 #include "core/css/CSSValue.h"
 #include "platform/graphics/Color.h"
+#include "wtf/BitVector.h"
 #include "wtf/Forward.h"
 #include "wtf/MathExtras.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class CSSBasicShape;
 class CSSCalcValue;
 class CSSToLengthConversionData;
 class Counter;
@@ skipping 104 matching lines @@
         UnitTypeViewportWidth,
         UnitTypeViewportHeight,
         UnitTypeViewportMin,
         UnitTypeViewportMax,
 
         // This value must come after the last length unit type to enable iteration over the length unit types.
         LengthUnitTypeCount,
     };
 
     typedef Vector<double, CSSPrimitiveValue::LengthUnitTypeCount> CSSLengthArray;
+    typedef BitVector CSSLengthTypeArray;
+
     void accumulateLengthArray(CSSLengthArray&, double multiplier = 1) const;
+    void accumulateLengthArray(CSSLengthArray&, CSSLengthTypeArray&, double multiplier = 1) const;
 
     // This enum follows the BisonCSSParser::Units enum augmented with UNIT_FREQUENCY for frequencies.
     enum UnitCategory {
         UNumber,
         UPercent,
         ULength,
         UAngle,
         UTime,
         UFrequency,
         UResolution,
@@ skipping 214 matching lines @@
         CSSBasicShape* shape;
         CSSCalcValue* calc;
         Counter* counter;
         Pair* pair;
         Rect* rect;
         Quad* quad;
     } m_value;
 };
 
 typedef CSSPrimitiveValue::CSSLengthArray CSSLengthArray;
+typedef CSSPrimitiveValue::CSSLengthTypeArray CSSLengthTypeArray;
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSPrimitiveValue, isPrimitiveValue());
 
 } // namespace blink
 
 #endif // CSSPrimitiveValue_h