Track async state in parser.

tests/compiler/dart2js/type_checker_test.dart

Index: tests/compiler/dart2js/type_checker_test.dart
diff --git a/tests/compiler/dart2js/type_checker_test.dart b/tests/compiler/dart2js/type_checker_test.dart
index b41971d15a67460ac99c13152433b41e19e06351..644f3d1387355367622c6dcd57c7c978d7b46fd1 100644
--- a/tests/compiler/dart2js/type_checker_test.dart
+++ b/tests/compiler/dart2js/type_checker_test.dart
@@ -2768,8 +2768,8 @@ analyzeIn(MockCompiler compiler, FunctionElement element, String text,
   Token tokens = scan(text);
   NodeListener listener =
       new NodeListener(const ScannerOptions(), compiler.reporter, null);
-  Parser parser = new Parser(listener,
-      asyncAwaitKeywordsEnabled: element.asyncMarker != AsyncMarker.SYNC);
+  Parser parser = new Parser(listener)
+    ..asyncState = element.asyncMarker.asyncParserState;
   parser.parseStatement(tokens);
   Node node = listener.popNode();
   TreeElements elements = compiler.resolveNodeStatement(node, element);