Split CSSPrimitiveValue into CSSPrimitiveValue and CSSIdentifierValue

third_party/WebKit/Source/core/animation/CSSPositionAxisListInterpolationType.cpp

Index: third_party/WebKit/Source/core/animation/CSSPositionAxisListInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/CSSPositionAxisListInterpolationType.cpp b/third_party/WebKit/Source/core/animation/CSSPositionAxisListInterpolationType.cpp
index cf8fb28bcc0e6af1fd3b36f9397d76136fa5db18..5050c5479a6d3ac36f15c36ef9ac6374ee67b838 100644
--- a/third_party/WebKit/Source/core/animation/CSSPositionAxisListInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/CSSPositionAxisListInterpolationType.cpp
@@ -6,7 +6,7 @@
 
 #include "core/animation/LengthInterpolationFunctions.h"
 #include "core/animation/ListInterpolationFunctions.h"
-#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/CSSIdentifierValue.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/CSSValuePair.h"
 
@@ -17,20 +17,20 @@ InterpolationValue CSSPositionAxisListInterpolationType::convertPositionAxisCSSV
     if (value.isValuePair()) {
         const CSSValuePair& pair = toCSSValuePair(value);
         InterpolationValue result = LengthInterpolationFunctions::maybeConvertCSSValue(pair.second());
-        CSSValueID side = toCSSPrimitiveValue(pair.first()).getValueID();
+        CSSValueID side = toCSSIdentifierValue(pair.first()).getValueID();
         if (side == CSSValueRight || side == CSSValueBottom)
             LengthInterpolationFunctions::subtractFromOneHundredPercent(result);
         return result;
     }
 
-    if (!value.isPrimitiveValue())
-        return nullptr;
-
-    const CSSPrimitiveValue& primitveValue = toCSSPrimitiveValue(value);
-    if (!primitveValue.isValueID())
+    if (value.isPrimitiveValue())
         return LengthInterpolationFunctions::maybeConvertCSSValue(value);
 
-    switch (primitveValue.getValueID()) {
+    if (!value.isIdentifierValue())
+        return nullptr;
+
+    const CSSIdentifierValue& ident = toCSSIdentifierValue(value);
+    switch (ident.getValueID()) {
     case CSSValueLeft:
     case CSSValueTop:
         return LengthInterpolationFunctions::createInterpolablePercent(0);