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

Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 Apple Inc. 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 647 matching lines @@
     // We do not apply the zoom factor when we are computing the value of the font-size property. The zooming
     // for font sizes is much more complicated, since we have to worry about enforcing the minimum font size preference
     // as well as enforcing the implicit "smart minimum."
     double result = getDoubleValue() * factor;
     if (isFontRelativeLength())
         return result;
 
     return result * conversionData.zoom();
 }
 
+void CSSPrimitiveValue::accumulateLengthArray(CSSLengthArray& lengthArray, CSSLengthTypeArray& lengthTypeArray, double multiplier) const
+{
+    ASSERT(lengthArray.size() == LengthUnitTypeCount);
+
+    if (m_primitiveUnitType == CSS_CALC) {
+        cssCalcValue()->accumulateLengthArray(lengthArray, lengthTypeArray, multiplier);
+        return;
+    }
+
+    LengthUnitType 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
 {
-    ASSERT(lengthArray.size() == LengthUnitTypeCount);
-
-    if (m_primitiveUnitType == CSS_CALC) {
-        cssCalcValue()->accumulateLengthArray(lengthArray, multiplier);
-        return;
-    }
-
-    LengthUnitType lengthType;
-    if (unitTypeToLengthUnitType(static_cast<UnitType>(m_primitiveUnitType), lengthType))
-        lengthArray.at(lengthType) += m_value.num * conversionToCanonicalUnitsScaleFactor(static_cast<UnitType>(m_primitiveUnitType)) * multiplier;
+    CSSLengthTypeArray lengthTypeArray;
+    lengthTypeArray.resize(CSSPrimitiveValue::LengthUnitTypeCount);
+    for (size_t i = 0; i < CSSPrimitiveValue::LengthUnitTypeCount; ++i)
+        lengthTypeArray.clear(i);
+    return CSSPrimitiveValue::accumulateLengthArray(lengthArray, lengthTypeArray, multiplier);
 }
 
 double CSSPrimitiveValue::conversionToCanonicalUnitsScaleFactor(UnitType unitType)
 {
     double factor = 1.0;
     // FIXME: the switch can be replaced by an array of scale factors.
     switch (unitType) {
     // These are "canonical" units in their respective categories.
     case CSS_PX:
     case CSS_DEG:
@@ skipping 535 matching lines @@
         visitor->trace(m_value.shape);
         break;
     default:
         break;
     }
 #endif
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink