CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/animation/DoubleStyleInterpolation.cpp

Index: Source/core/animation/DoubleStyleInterpolation.cpp
diff --git a/Source/core/animation/DoubleStyleInterpolation.cpp b/Source/core/animation/DoubleStyleInterpolation.cpp
index 68a91d7507c40e23ca36817b9bd368149964741c..81bd5755dec731a039ae1c50c20f554bf8d1a18e 100644
--- a/Source/core/animation/DoubleStyleInterpolation.cpp
+++ b/Source/core/animation/DoubleStyleInterpolation.cpp
@@ -18,7 +18,7 @@ bool DoubleStyleInterpolation::canCreateFrom(const CSSValue& value)
 PassOwnPtrWillBeRawPtr<InterpolableValue> DoubleStyleInterpolation::doubleToInterpolableValue(const CSSValue& value)
 {
     ASSERT(canCreateFrom(value));
-    const CSSPrimitiveValue primitive = toCSSPrimitiveValue(value);
+    const CSSPrimitiveValue& primitive = toCSSPrimitiveValue(value);
     if (primitive.isNumber())
         return InterpolableNumber::create(primitive.getDoubleValue());
     if (primitive.isAngle())
@@ -102,10 +102,10 @@ bool extractMotionRotation(const CSSValue& value, float* rotation, MotionRotatio
 
     int len = list.length();
     for (int i = 0; i < len; i++) {
-        const CSSValue item = list.item(i);
+        const CSSValue& item = list.item(i);
         if (!item.isPrimitiveValue())
             return false;
-        const CSSPrimitiveValue primitiveValue = toCSSPrimitiveValue(item);
+        const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(item);
         if (primitiveValue.getValueID() == CSSValueAuto) {
             *rotationType = MotionRotationAuto;
         } else if (primitiveValue.getValueID() == CSSValueReverse) {