Update worker mode to use the bazel protos directly instead of json

pkg/analyzer_cli/test/all.dart

Index: pkg/analyzer_cli/test/all.dart
diff --git a/pkg/analyzer_cli/test/all.dart b/pkg/analyzer_cli/test/all.dart
index 13f72d1388fb3a24e2ca32c5acc6902c374c8a8b..05d8a9862983e35241a6fc0f0c110a2bb578eff0 100644
--- a/pkg/analyzer_cli/test/all.dart
+++ b/pkg/analyzer_cli/test/all.dart
@@ -6,6 +6,7 @@ import 'boot_loader_test.dart' as boot_loader;
 import 'build_mode_test.dart' as build_mode_test;
 import 'driver_test.dart' as driver;
 import 'error_test.dart' as error;
+import 'message_grouper_test.dart' as message_grouper;
 import 'options_test.dart' as options;
 import 'package_prefix_test.dart' as package_prefix;
 import 'perf_report_test.dart' as perf;
@@ -24,6 +25,7 @@ main() {
   //sdk_ext.main();
   //strong_mode.main();
   error.main();
+  message_grouper.main();
   options.main();
   perf.main();
   plugin_manager.main();