Added polyfill for var (moved from web_ui)

pkg/csslib/lib/parser.dart

 // Copyright (c) 2012, 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.
 
 library csslib.parser;
 
 import 'dart:math' as math;
 
 import 'package:source_maps/span.dart' show SourceFile, Span, FileSpan;
 
 import "visitor.dart";
 import 'src/messages.dart';
 import 'src/options.dart';
 
 part 'src/analyzer.dart';
+part 'src/polyfill.dart';
 part 'src/property.dart';
 part 'src/token.dart';
 part 'src/tokenizer_base.dart';
 part 'src/tokenizer.dart';
 part 'src/tokenkind.dart';
 
 
 /** Used for parser lookup ahead (used for nested selectors Less support). */
 class ParserState extends TokenizerState {
   final Token peekToken;
@@ skipping 11 matching lines @@
   }
   var opt = PreprocessorOptions.parse(options);
   messages = new Messages(options: opt, printHandler: errors.add);
 }
 
 /** CSS checked mode enabled. */
 bool get isChecked => messages.options.checked;
 
 // TODO(terry): Remove nested name parameter.
 /** Parse and analyze the CSS file. */
-StyleSheet compile(var input, {List errors, List options, bool nested: true}) {
+StyleSheet compile(var input,
+    {List errors, List options, bool nested: true, bool polyfill: false}) {
   var source = _inputAsString(input);
 
   _createMessages(errors: errors, options: options);
 
   var file = new SourceFile.text(null, source);
 
   var tree = new Parser(file, source).parse();
 
   analyze([tree], errors: errors, options: options);
 
+  if (polyfill) {
+    var processCss = new PolyFill(messages, true);
+    processCss.process(tree);
+  }
+
   return tree;
 }
 
 /** Analyze the CSS file. */
 void analyze(List<StyleSheet> styleSheets,  {List errors, List options}) {
   _createMessages(errors: errors, options: options);
   new Analyzer(styleSheets, messages).run();
 }
 
 /**
@@ skipping 2325 matching lines @@
 
     if (replace != null && result == null) {
       result = new StringBuffer(text.substring(0, i));
     }
 
     if (result != null) result.write(replace != null ? replace : text[i]);
   }
 
   return result == null ? text : result.toString();
 }