Clean up some CSSPropertyID helpers

Source/build/scripts/make_css_property_names.py

Index: Source/build/scripts/make_css_property_names.py
diff --git a/Source/build/scripts/make_css_property_names.py b/Source/build/scripts/make_css_property_names.py
index e5237c94c67b672baa6718b0993db74389924aa9..4a591d3c7a371d8485fe9a4c411f33dab183123c 100755
--- a/Source/build/scripts/make_css_property_names.py
+++ b/Source/build/scripts/make_css_property_names.py
@@ -55,6 +55,10 @@ inline CSSPropertyID resolveCSSPropertyID(CSSPropertyID id)
 
 inline bool isPropertyAlias(CSSPropertyID id) { return id & 512; }
 
+CSSPropertyID unresolvedCSSPropertyID(const WTF::String&);
+
+CSSPropertyID cssPropertyID(const WTF::String&);
+
 } // namespace blink
 
 namespace WTF {
@@ -161,6 +165,11 @@ String getJSPropertyName(CSSPropertyID id)
     return String(result);
 }
 
+CSSPropertyID cssPropertyID(const String& string)
+{
+    return resolveCSSPropertyID(unresolvedCSSPropertyID(string));
+}
+
 } // namespace blink
 """