Clean up some CSSPropertyID helpers

Source/build/scripts/make_css_property_names.py

 #!/usr/bin/env python
 
 import subprocess
 import sys
 
 import css_properties
 import in_generator
 import license
 
 
@@ skipping 37 matching lines @@
     return static_cast<CSSPropertyID>(value);
 }
 
 inline CSSPropertyID resolveCSSPropertyID(CSSPropertyID id)
 {
     return convertToCSSPropertyID(id & ~512);
 }
 
 inline bool isPropertyAlias(CSSPropertyID id) { return id & 512; }
 
+CSSPropertyID unresolvedCSSPropertyID(const WTF::String&);
+
+CSSPropertyID cssPropertyID(const WTF::String&);
+
 } // namespace blink
 
 namespace WTF {
 template<> struct DefaultHash<blink::CSSPropertyID> { typedef IntHash<unsigned> Hash; };
 template<> struct HashTraits<blink::CSSPropertyID> : GenericHashTraits<blink::CSSPropertyID> {
     static const bool emptyValueIsZero = true;
     static void constructDeletedValue(blink::CSSPropertyID& slot, bool) { slot = static_cast<blink::CSSPropertyID>(blink::lastUnresolvedCSSProperty + 1); }
     static bool isDeletedValue(blink::CSSPropertyID value) { return value == (blink::lastUnresolvedCSSProperty + 1); }
 };
 }
@@ skipping 86 matching lines @@
             if (!nextCharacter)
                 break;
             character = (propertyNamePointer - 2 != cssPropertyName) ? toASCIIUpper(nextCharacter) : nextCharacter;
         }
         *resultPointer++ = character;
     }
     *resultPointer = '\\0';
     return String(result);
 }
 
+CSSPropertyID cssPropertyID(const String& string)
+{
+    return resolveCSSPropertyID(unresolvedCSSPropertyID(string));
+}
+
 } // namespace blink
 """
 
 
 class CSSPropertyNamesWriter(css_properties.CSSProperties):
     class_name = "CSSPropertyNames"
 
     def __init__(self, in_file_path):
         super(CSSPropertyNamesWriter, self).__init__(in_file_path)
         self._outputs = {(self.class_name + ".h"): self.generate_header,
@@ skipping 39 matching lines @@
         # FIXME: If we could depend on Python 2.7, we would use subprocess.check_output
         gperf_args = [self.gperf_path, '--key-positions=*', '-P', '-n']
         gperf_args.extend(['-m', '50'])  # Pick best of 50 attempts.
         gperf_args.append('-D')  # Allow duplicate hashes -> More compact code.
         gperf = subprocess.Popen(gperf_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, universal_newlines=True)
         return gperf.communicate(gperf_input)[0]
 
 
 if __name__ == "__main__":
     in_generator.Maker(CSSPropertyNamesWriter).main(sys.argv)