Add completion tests for the new analysis driver.

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

Index: pkg/analysis_server/test/services/completion/dart/field_formal_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/field_formal_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/field_formal_contributor_test.dart
index 18da62cd14340efc1f6834fc9656ff2b74915e96..9583d5fbc4c00a3298c92f907ec5adef96fd3107 100644
--- a/pkg/analysis_server/test/services/completion/dart/field_formal_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/field_formal_contributor_test.dart
@@ -14,6 +14,7 @@ import 'completion_contributor_util.dart';
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(FieldFormalContributorTest);
+    defineReflectiveTests(FieldFormalContributorTest_Driver);
   });
 }
 
@@ -197,3 +198,9 @@ class FieldFormalContributorTest extends DartCompletionContributorTest {
     assertNotSuggested('x');
   }
 }
+
+@reflectiveTest
+class FieldFormalContributorTest_Driver extends FieldFormalContributorTest {
+  @override
+  bool get enableNewAnalysisDriver => true;
+}