Add ServerOperation and queue.

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 53f8458ae2026de0c282adb805010915d886cd5b..857e73f163bb6e581fad000d48943764f5a0f764 100644
--- a/pkg/analysis_server/test/mocks.dart
+++ b/pkg/analysis_server/test/mocks.dart
@@ -54,8 +54,8 @@ Future pumpEventQueue([int times = 20]) {
  * Returns a [Future] that completes when the given [AnalysisServer] finished
  * all its scheduled tasks.
  */
-Future waitForServerTasksFinished(AnalysisServer server) {
-  if (server.test_areTasksFinished()) {
+Future waitForServerOperationsPerformed(AnalysisServer server) {
+  if (server.test_areOperationsFinished()) {
     return new Future.value();
   }
   // We use a delayed future to allow microtask events to finish. The
@@ -63,7 +63,7 @@ Future waitForServerTasksFinished(AnalysisServer server) {
   // would therefore not wait for microtask callbacks that are scheduled after
   // invoking this method.
   return new Future.delayed(Duration.ZERO,
-      () => waitForServerTasksFinished(server));
+      () => waitForServerOperationsPerformed(server));
 }
 
 /**