hook new DartCompletionContributor API into existing framework

pkg/analysis_server/test/services/completion/dart/test_all.dart

Index: pkg/analysis_server/test/services/completion/dart/test_all.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/test_all.dart b/pkg/analysis_server/test/services/completion/dart/test_all.dart
index f3570c148eda2f7bd6f0bf84643ba64147ba4403..dfa7512f76d003986774c2b0047663201c498f12 100644
--- a/pkg/analysis_server/test/services/completion/dart/test_all.dart
+++ b/pkg/analysis_server/test/services/completion/dart/test_all.dart
@@ -5,10 +5,11 @@
 library test.services.completion.dart;
 
 import 'package:unittest/unittest.dart';
-import 'inherited_contributor_test.dart' as inherited_contributor_test;
-import 'common_usage_sorter_test.dart' as common_usage_test;
 
 import '../../../utils.dart';
+import 'common_usage_sorter_test.dart' as common_usage_test;
+import 'inherited_contributor_test.dart' as inherited_contributor_test;
+import 'keyword_contributor_test.dart' as keyword_test;
 
 /// Utility for manually running all tests.
 main() {
@@ -16,5 +17,6 @@ main() {
   group('dart/completion', () {
     common_usage_test.main();
     inherited_contributor_test.main();
+    keyword_test.main();
   });
 }