Split "_Driver" tests to separate test files.

pkg/analysis_server/test/test_all.dart

Index: pkg/analysis_server/test/test_all.dart
diff --git a/pkg/analysis_server/test/test_all.dart b/pkg/analysis_server/test/test_all.dart
index 3e7b635324cd7bb338d0ec86c6a33d5055c7acc5..0f7942fae63ddfede702f9badb1b35b441da3b36 100644
--- a/pkg/analysis_server/test/test_all.dart
+++ b/pkg/analysis_server/test/test_all.dart
@@ -8,6 +8,7 @@ import 'analysis/test_all.dart' as analysis_all;
 import 'analysis_server_test.dart' as analysis_server_test;
 import 'channel/test_all.dart' as channel_test;
 import 'completion_test.dart' as completion_test;
+import 'context_manager_driver_test.dart' as context_manager_driver_test;
 import 'context_manager_test.dart' as context_manager_test;
 import 'domain_analysis_test.dart' as domain_analysis_test;
 import 'domain_completion_test.dart' as domain_completion_test;
@@ -36,6 +37,7 @@ main() {
     analysis_server_test.main();
     channel_test.main();
     completion_test.main();
+    context_manager_driver_test.main();
     context_manager_test.main();
     domain_analysis_test.main();
     domain_completion_test.main();