Make camelcasing use a regular expression for CSS properties.

tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate

Index: tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate b/tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate
index 3155235055f1a6f36dec6e85afe34b029d983385..85360935bafa7a80ed6f9bbba7ac8c449791f4c5 100644
--- a/tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate
+++ b/tools/dom/templates/html/impl/impl_CSSStyleDeclaration.darttemplate
@@ -76,18 +76,10 @@ $endif
   }
 
   String _camelCase(String hyphenated) {

[sra1, 2014/08/07 22:16:20]

static

-    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),

[sra1, 2014/08/07 21:46:38]

Put the regexps in private static fields to avoid recompiling them each time.

+        (match) => match[0][1].toUpperCase() + match[0].substring(2));
   }
 
 $if DART2JS