Add an integration test for analysis.overrides.

pkg/analysis_server/test/integration/integration_test_methods.dart

Index: pkg/analysis_server/test/integration/integration_test_methods.dart
diff --git a/pkg/analysis_server/test/integration/integration_test_methods.dart b/pkg/analysis_server/test/integration/integration_test_methods.dart
index 9a7c85eef40b1669870e2ecf1858059bea3bd25d..9ffd6190fed41bb67dddd920e44194499c10e464 100644
--- a/pkg/analysis_server/test/integration/integration_test_methods.dart
+++ b/pkg/analysis_server/test/integration/integration_test_methods.dart
@@ -636,10 +636,7 @@ abstract class IntegrationTestMixin {
   StreamController _onAnalysisOutline;
 
   /**
-   * Reports the overridding members in a file. This notification currently
-   * includes only members that override a member from a superclass. In
-   * particular, it does not include members that override members from
-   * interfaces.
+   * Reports the overridding members in a file.
    *
    * This notification is not subscribed to by default. Clients can subscribe
    * by including the value "OVERRIDES" in the list of services passed in an