Change analysis server protocol to omit empty lists when optional.

pkg/analysis_server/test/integration/integration_tests.dart

Index: pkg/analysis_server/test/integration/integration_tests.dart
diff --git a/pkg/analysis_server/test/integration/integration_tests.dart b/pkg/analysis_server/test/integration/integration_tests.dart
index 305ea8a5671fb17be7638c4fbe67b72d457a289d..982c3c041cc311db43dba1a980d621e65eb8d56c 100644
--- a/pkg/analysis_server/test/integration/integration_tests.dart
+++ b/pkg/analysis_server/test/integration/integration_tests.dart
@@ -96,9 +96,9 @@ abstract class AbstractAnalysisServerIntegrationTest extends
   Future standardAnalysisSetup({bool subscribeStatus: true}) {
     List<Future> futures = <Future>[];
     if (subscribeStatus) {
-      futures.add(sendServerSetSubscriptions(['STATUS']));
+      futures.add(sendServerSetSubscriptions(subscriptions: ['STATUS']));
     }
-    futures.add(sendAnalysisSetAnalysisRoots([sourceDirectory.path], []));
+    futures.add(sendAnalysisSetAnalysisRoots(included: [sourceDirectory.path]));
     return Future.wait(futures);
   }
 
@@ -143,11 +143,12 @@ abstract class AbstractAnalysisServerIntegrationTest extends
   }
 
   @override
-  Future sendServerSetSubscriptions(List<String> subscriptions, {bool
+  Future sendServerSetSubscriptions({List<String> subscriptions, bool
       checkTypes: true}) {
-    _subscribedToServerStatus = subscriptions.contains('STATUS');
-    return super.sendServerSetSubscriptions(subscriptions, checkTypes:
-        checkTypes);
+    _subscribedToServerStatus = subscriptions != null &&
+        subscriptions.contains('STATUS');
+    return super.sendServerSetSubscriptions(subscriptions: subscriptions,
+        checkTypes: checkTypes);
   }
 
   /**