Do regular expression for camelCase CSS processing in JS.

tools/dom/scripts/css_code_generator.py

Index: tools/dom/scripts/css_code_generator.py
diff --git a/tools/dom/scripts/css_code_generator.py b/tools/dom/scripts/css_code_generator.py
index 5230aacf069280df21d0da79c0aa4a1cd0242a43..e7843b515cd754c8635f01bae7fd134735b32c7a 100644
--- a/tools/dom/scripts/css_code_generator.py
+++ b/tools/dom/scripts/css_code_generator.py
@@ -126,10 +126,18 @@ $endif
   }
 
   static String _camelCase(String hyphenated) {
+$if DART2JS
+    var replacedMs = JS('String', r'#.replace(/^-ms-/, "ms-")', hyphenated);
+
+    var fToUpper = const JS_CONST(
+        r'function(_, letter) { return letter.toUpperCase(); }');
+    return JS('String', r'#.replace(/-([\da-z])/ig, #)', replacedMs, fToUpper);
+$else
     // The "ms" prefix is always lowercased.

[sra1, 2014/08/08 00:49:28]

This comment should go outside the $if

     return hyphenated.replaceFirst(new RegExp('^-ms-'), 'ms-').replaceAllMapped(
         new RegExp('-([a-z]+)', caseSensitive: false),
         (match) => match[0][1].toUpperCase() + match[0].substring(2));
+$endif
   }
 
 $if DART2JS