Fix for dynamic instance field reference highlighting.

pkg/analysis_server/test/analysis/notification_highlights_test2.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.highlights2;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
@@ skipping 713 matching lines @@
       assertHasRegion(
           HighlightRegionType.INSTANCE_FIELD_DECLARATION, 'aaa = 1');
       assertHasRegion(
           HighlightRegionType.INSTANCE_FIELD_DECLARATION, 'bbb = 2');
       assertHasRegion(HighlightRegionType.INSTANCE_FIELD_REFERENCE, 'bbb = 3');
       assertHasRegion(HighlightRegionType.INSTANCE_SETTER_REFERENCE, 'aaa = 4');
       assertHasRegion(HighlightRegionType.INSTANCE_SETTER_REFERENCE, 'bbb = 5');
     });
   }
 
+  test_INSTANCE_FIELD_dynamic() {
+    addTestFile('''
+class A {
+  var f;
+  A(this.f);
+}
+''');
+    return prepareHighlights().then((_) {
+      assertHasRegion(HighlightRegionType.INSTANCE_FIELD_DECLARATION, 'f;');
+      assertHasRegion(HighlightRegionType.INSTANCE_FIELD_REFERENCE, 'f);');
+    });
+  }
+
   test_KEYWORD() {
     addTestFile('''
 main() {
   assert(true);
   for (;;) break;
   switch (0) {
     case 0: break;
     default: break;
   }
   try {} catch (e) {}
@@ skipping 338 matching lines @@
   void test_toString() {
     expect(HighlightRegionType.CLASS.toString(), 'HighlightRegionType.CLASS');
   }
 
   void test_valueOf_unknown() {
     expect(() {
       new HighlightRegionType('no-such-type');
     }, throws);
   }
 }