Introduces `ParserOptions`.

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

Index: pkg/compiler/lib/src/parser/partial_parser.dart
diff --git a/pkg/compiler/lib/src/parser/partial_parser.dart b/pkg/compiler/lib/src/parser/partial_parser.dart
index 1c7722f881d7c82c9baf3f9101a8b717169a071e..1f0c8b75a9a33b97008b898ea8ff5da548cbe82c 100644
--- a/pkg/compiler/lib/src/parser/partial_parser.dart
+++ b/pkg/compiler/lib/src/parser/partial_parser.dart
@@ -17,12 +17,12 @@ import '../tokens/token_constants.dart' as Tokens show
 import 'listener.dart' show
     Listener;
 import 'parser.dart' show
-    Parser;
+    Parser,
+    ParserOptions;
 
 class PartialParser extends Parser {
-  PartialParser(Listener listener, {bool enableConditionalDirectives})
-      : super(listener,
-          enableConditionalDirectives: enableConditionalDirectives);
+  PartialParser(Listener listener, ParserOptions options)
+      : super(listener, options);
 
   Token parseClassBody(Token token) => skipClassBody(token);