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..bdfdad6aace7a5e5ea6be0bd931f05b33ce760db 100644
--- a/Source/core/css/CSSPrimitiveValue.cpp
+++ b/Source/core/css/CSSPrimitiveValue.cpp
@@ -665,7 +665,7 @@ 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);
 
@@ -675,8 +675,19 @@ void CSSPrimitiveValue::accumulateLengthArray(CSSLengthArray& lengthArray, doubl
     }
 
     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);
+    }
+}
+
+void CSSPrimitiveValue::accumulateLengthArray(CSSLengthArray& lengthArray, double multiplier) const
+{
+    CSSLengthTypeArray zeroLengthTypeArray;

[samli, 2014/12/22 06:23:10]

lengthTypeArray is fine

[evemj (not active), 2014/12/22 23:05:15]

Done.

+    zeroLengthTypeArray.resize(CSSPrimitiveValue::LengthUnitTypeCount);
+    for (size_t i = 0; i < CSSPrimitiveValue::LengthUnitTypeCount; ++i)
+        zeroLengthTypeArray.clear(i);
+    return accumulateLengthArray(lengthArray, zeroLengthTypeArray, multiplier);
 }
 
 double CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(UnitType unitType)