Add support for highlights notification

pkg/analyzer_plugin/test/plugin/test_all.dart

Index: pkg/analyzer_plugin/test/plugin/test_all.dart
diff --git a/pkg/analyzer_plugin/test/plugin/test_all.dart b/pkg/analyzer_plugin/test/plugin/test_all.dart
index 94a42256f13fdfac083489a4e7976bf28bd9a65e..f0b12832ad3061b76d1f6da24a2d6c17b0e3f640 100644
--- a/pkg/analyzer_plugin/test/plugin/test_all.dart
+++ b/pkg/analyzer_plugin/test/plugin/test_all.dart
@@ -7,6 +7,7 @@ import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'assist_mixin_test.dart' as assist_mixin_test;
 import 'completion_mixin_test.dart' as completion_mixin_test;
 import 'fix_mixin_test.dart' as fix_mixin_test;
+import 'highlights_mixin_test.dart' as highlights_mixin_test;
 import 'kythe_mixin_test.dart' as kythe_mixin_test;
 import 'navigation_mixin_test.dart' as navigation_mixin_test;
 import 'outline_mixin_test.dart' as outline_mixin_test;
@@ -17,6 +18,7 @@ main() {
     assist_mixin_test.main();
     completion_mixin_test.main();
     fix_mixin_test.main();
+    highlights_mixin_test.main();
     kythe_mixin_test.main();
     navigation_mixin_test.main();
     outline_mixin_test.main();