Run src/task/strong tests with analysis driver.

pkg/analyzer/test/src/task/strong/checker_test.dart

Index: pkg/analyzer/test/src/task/strong/checker_test.dart
diff --git a/pkg/analyzer/test/src/task/strong/checker_test.dart b/pkg/analyzer/test/src/task/strong/checker_test.dart
index 0138cb906a1a964c4821dc1539ec923871c99d70..2972ff98f099b96383f69c7048c980d7d0c86077 100644
--- a/pkg/analyzer/test/src/task/strong/checker_test.dart
+++ b/pkg/analyzer/test/src/task/strong/checker_test.dart
@@ -11,7 +11,7 @@ import 'strong_test_helper.dart';
 void main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(CheckerTest);
-//    defineReflectiveTests(CheckerTest_Driver);
+    defineReflectiveTests(CheckerTest_Driver);
   });
 }
 
@@ -4139,8 +4139,14 @@ const Object virtual = const _Virtual();
   }
 }
 
-//@reflectiveTest
-//class CheckerTest_Driver extends CheckerTest {
-//  @override
-//  bool get enableNewAnalysisDriver => true;
-//}
+@reflectiveTest
+class CheckerTest_Driver extends CheckerTest {
+  @override
+  bool get enableNewAnalysisDriver => true;
+
+  @failingTest
+  @override
+  test_covariantOverride_fields() async {
+    await super.test_covariantOverride_fields();
+  }
+}