Make camelcasing use a regular expression for CSS properties.

tools/dom/scripts/css_code_generator.py

 #!/usr/bin/python
 #
 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """Generates CSSStyleDeclaration template file from css property definitions
 defined in WebKit."""
 
 import tempfile, os
@@ skipping 108 matching lines @@
   void setProperty(String propertyName, String value, [String priority]) {
     if (_supportsProperty(_camelCase(propertyName))) {
       return _setPropertyHelper(propertyName, value, priority);
     } else {
       return _setPropertyHelper(Device.cssPrefix + propertyName, value,
           priority);
     }
   }
 
   String _camelCase(String hyphenated) {
-    bool firstWord = true;
-    return hyphenated.splitMapJoin('-', onMatch : (_) => '',
-        onNonMatch : (String word) {
-      if (word.length > 0) {
-        if (firstWord) {
-          firstWord = false;
-          return word;
-        }
-        return word[0].toUpperCase() + word.substring(1);
-      }
-      return '';
-    });
+    // The "ms" prefix is always lowercased.
+    return hyphenated.replaceFirst(new RegExp('^-ms-'), 'ms-').replaceAllMapped(
+        new RegExp('-([a-z]+)', caseSensitive: false),
+        (match) => match[0][1].toUpperCase() + match[0].substring(2));
   }
 
 $if DART2JS
   void _setPropertyHelper(String propertyName, String value, [String priority]) {
     // try/catch for IE9 which throws on unsupported values.
     try {
       if (value == null) value = '';
       if (priority == null) {
         priority = '';
       }
@@ skipping 85 matching lines @@
       class_lines.append(annotated[base_css_name])
     class_lines.append("""
   void set %s(String value) {
     setProperty('%s', value, '');
   }
 """ % (camel_case_name, css_name))
 
   class_file.write(''.join(class_lines));
   class_file.write('}\n')
   class_file.close()