Fix for 'await' highlighting in for-each.

pkg/analysis_server/test/analysis/notification_highlights_test.dart

 // Copyright (c) 2014, 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 test.analysis.notification.highlights;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
@@ skipping 162 matching lines @@
       assertHasStringRegion(HighlightRegionType.BUILT_IN, 'async');
       assertHasStringRegion(HighlightRegionType.BUILT_IN, 'async*');
       assertNoRegion(HighlightRegionType.BUILT_IN, 'async = false');
     });
   }
 
   test_BUILT_IN_await() {
     addTestFile('''
 main() async {
   await 42;
+  await for (var item in []) {
+    print(item);
+  }
 }
 ''');
     return prepareHighlights().then((_) {
       assertHasRegion(HighlightRegionType.BUILT_IN, 'await 42');
+      assertHasRegion(HighlightRegionType.BUILT_IN, 'await for');
     });
   }
 
   test_BUILT_IN_deferred() {
     addTestFile('''
 import 'dart:math' deferred as math;
 main() {
   var deferred = 42;
 }''');
     return prepareHighlights().then((_) {
@@ skipping 827 matching lines @@
   void test_toString() {
     expect(HighlightRegionType.CLASS.toString(), 'HighlightRegionType.CLASS');
   }
 
   void test_valueOf_unknown() {
     expect(() {
       new HighlightRegionType('no-such-type');
     }, throws);
   }
 }