message: Fix up missing interface implementation in TestDeltaQueue
diff: @@ -30,6 +30,14 @@ export class TestDeltaQueue<T> extends EventEmitter implements IDeltaQueue<T> {
  this.resumeDeferred.resolve();
  }
  + public systemPause() {
  + this.pause();
  + }
  +
  + public systemResume() {
  + this.resume();
  + }
  +
  public waitForResume(): Promise<void> {
  assert(this.paused);
  return this.resumeDeferred.promise;
  