Mark analyser tests as slow.

pkg/pkg.status

Index: pkg/pkg.status
diff --git a/pkg/pkg.status b/pkg/pkg.status
index 06d95a7a3eb44780dab7a5f05b9cccdd5020c558..12be4ae685f081644a98ba4e48fb33f342f41728 100644
--- a/pkg/pkg.status
+++ b/pkg/pkg.status
@@ -116,7 +116,12 @@ crypto/test/base64_test: Timeout # Issue 12486
 collection/test/priority_queue_test: Pass, Slow # Issue 16426
 serialization/test/serialization_test: Skip
 
+[ $runtime == d8 ]
+analysis_server/test/analysis_notification_outline_test: Pass, Slow # Issue 19756
+analysis_server/test/domain_search_test: Pass, Slow # Issue 19756
+
 [ $runtime == jsshell ]
+analysis_server/test/domain_analysis_test: Pass, Slow # Issue 16473, 19756
 analyzer/test/generated/element_test: Pass, Slow # Issue 16473
 
 [ $runtime == d8 || $runtime == jsshell ]