pkg: Eliminate flaky analysis test failure.

pkg/analysis_server/test/analysis/notification_implemented_test.dart

Index: pkg/analysis_server/test/analysis/notification_implemented_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_implemented_test.dart b/pkg/analysis_server/test/analysis/notification_implemented_test.dart
index 9f96762d389420545a4a6f7933b6add41e7bb829..5898daf4ee5ca4d14e36c04db9ec10df9928ff9f 100644
--- a/pkg/analysis_server/test/analysis/notification_implemented_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_implemented_test.dart
@@ -312,8 +312,8 @@ class B extends A {
         return new Future.value();
       }
       return new Future.delayed(
-          Duration.ZERO, () => waitForNotification(times - 1));
+          new Duration(milliseconds:1), () => waitForNotification(times - 1));
     }
-    return waitForNotification(100);
+    return waitForNotification(30000);
   }
 }