Issue 22492. Increase number of event pumping cycles.

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 9475cbbe24a52464077c93eed429f18fa0ca187b..cb314c69f7df1b690af994cdd82199a1ebe79ee0 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 = 50]) {
+Future pumpEventQueue([int times = 500]) {
   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