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

Source/core/css/CSSPrimitiveValue.cpp

Index: Source/core/css/CSSPrimitiveValue.cpp
diff --git a/Source/core/css/CSSPrimitiveValue.cpp b/Source/core/css/CSSPrimitiveValue.cpp
index d374c542df1dcf1ec4d9f15b0f90cdf07b99f96c..39b26e8b34239d168045e0b774e9bfa1545e6e97 100644
--- a/Source/core/css/CSSPrimitiveValue.cpp
+++ b/Source/core/css/CSSPrimitiveValue.cpp
@@ -665,18 +665,20 @@ double CSSPrimitiveValue::computeLengthDouble(const CSSToLengthConversionData& c
     return result * conversionData.zoom();
 }
 
-void CSSPrimitiveValue::accumulateLengthArray(CSSLengthArray& lengthArray, double multiplier) const
+void CSSPrimitiveValue::accumulateLengthArray(CSSLengthArray& lengthArray, CSSLengthTypeArray& lengthTypeArray, double multiplier) const
 {
     ASSERT(lengthArray.size() == LengthUnitTypeCount);
 
     if (m_primitiveUnitType == CSS_CALC) {
-        cssCalcValue()->accumulateLengthArray(lengthArray, multiplier);
+        cssCalcValue()->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier);
         return;
     }
 
     LengthUnitType lengthType;
-    if (unitTypeToLengthUnitType(static_cast<UnitType>(m_primitiveUnitType), lengthType))
+    if (unitTypeToLengthUnitType(static_cast<UnitType>(m_primitiveUnitType), lengthType)) {
         lengthArray.at(lengthType) += m_value.num * conversionToCanonicalUnitsScaleFactor(static_cast<UnitType>(m_primitiveUnitType)) * multiplier;
+        lengthTypeArray.set(lengthType);
+    }
 }
 
 double CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(UnitType unitType)