Send notifications using separate server operations.

pkg/analysis_server/test/mocks.dart

Index: pkg/analysis_server/test/mocks.dart
diff --git a/pkg/analysis_server/test/mocks.dart b/pkg/analysis_server/test/mocks.dart
index 49c2d039a56226ece6120add178f250b47179378..8644cd9aa1948a49e89f79c3cd85f72d03f304f1 100644
--- a/pkg/analysis_server/test/mocks.dart
+++ b/pkg/analysis_server/test/mocks.dart
@@ -58,7 +58,7 @@ Matcher isResponseSuccess(String id) => new _IsResponseSuccess(id);
  * times. By default, this should pump the event queue enough times to allow
  * any code to run, as long as it's not waiting on some external event.
  */
-Future pumpEventQueue([int times = 20]) {
+Future pumpEventQueue([int times = 50]) {
   if (times == 0) return new Future.value();
   // We use a delayed future to allow microtask events to finish. The
   // Future.value or Future() constructors use scheduleMicrotask themselves and
@@ -323,15 +323,10 @@ class MockServerOperation implements PerformAnalysisOperation {
   bool get isContinue => false;
 
   @override
-  void perform(AnalysisServer server) => this._perform(server);
-
-  @override
-  void sendNotices(AnalysisServer server, List<ChangeNotice> notices) {
-  }
+  bool get isPriority => null;
 
   @override
-  void updateIndex(AnalysisServer server, List<ChangeNotice> notices) {
-  }
+  void perform(AnalysisServer server) => this._perform(server);
 }