dart2js: add support for configuration-specific imports.

pkg/compiler/lib/src/parser/class_element_parser.dart

Index: pkg/compiler/lib/src/parser/class_element_parser.dart
diff --git a/pkg/compiler/lib/src/parser/class_element_parser.dart b/pkg/compiler/lib/src/parser/class_element_parser.dart
index 745665d07b404ea753de06d4553348c8ebea23df..319cba59c96049d927c23a41b0eb629a93c6bb7d 100644
--- a/pkg/compiler/lib/src/parser/class_element_parser.dart
+++ b/pkg/compiler/lib/src/parser/class_element_parser.dart
@@ -13,7 +13,8 @@ import 'partial_parser.dart' show
     PartialParser;
 
 class ClassElementParser extends PartialParser {
-  ClassElementParser(Listener listener) : super(listener);
+  ClassElementParser(Listener listener)
+      : super(listener, enableConditionalDirectives: false);

[floitsch, 2015/10/13 21:01:44]

It was hard to get the actual flag to this parser.
Since it only deals with classes, I just forced the argument to 'false'.
If that doesn't look ok, please speak up.

[Johnni Winther, 2015/10/14 07:21:52]

The plan is to have a ParsingOptions object that is always provided.

 
   Token parseClassBody(Token token) => fullParseClassBody(token);
 }