Make UseCounters work on aliased properties

Source/core/animation/css/CSSTransitionData.h

Index: Source/core/animation/css/CSSTransitionData.h
diff --git a/Source/core/animation/css/CSSTransitionData.h b/Source/core/animation/css/CSSTransitionData.h
index 801e2f77aa427e38143737f4631d7ffdc974f53c..fc9d1c9db567f9f16118ac8c1404a61eedeb2210 100644
--- a/Source/core/animation/css/CSSTransitionData.h
+++ b/Source/core/animation/css/CSSTransitionData.h
@@ -24,29 +24,29 @@ public:
     struct TransitionProperty {
         TransitionProperty(CSSPropertyID id)
             : propertyType(TransitionSingleProperty)
-            , propertyId(id)
+            , unresolvedProperty(id)
         {
             ASSERT(id != CSSPropertyInvalid);
         }
 
         TransitionProperty(const String& string)
             : propertyType(TransitionUnknown)
-            , propertyId(CSSPropertyInvalid)
+            , unresolvedProperty(CSSPropertyInvalid)
             , propertyString(string)
         {
         }
 
         TransitionProperty(TransitionPropertyType type)
             : propertyType(type)
-            , propertyId(CSSPropertyInvalid)
+            , unresolvedProperty(CSSPropertyInvalid)
         {
             ASSERT(type == TransitionNone || type == TransitionAll);
         }
 
-        bool operator==(const TransitionProperty& other) const { return propertyType == other.propertyType && propertyId == other.propertyId && propertyString == other.propertyString; }
+        bool operator==(const TransitionProperty& other) const { return propertyType == other.propertyType && unresolvedProperty == other.unresolvedProperty && propertyString == other.propertyString; }
 
         TransitionPropertyType propertyType;
-        CSSPropertyID propertyId;
+        CSSPropertyID unresolvedProperty;
         String propertyString;
     };