Initialize launchCookie in fillTaskInfo.

- This can cause that some tasks are routed to the wrong TaskListener.
- The TaskInfo can be reused if the previous TaskOrganizerController
  .dispatchTaskInfoChanged() exits in the middle:
    http://shortn/_I3HhUmbKPh

Bug: 177490846
Test: Check if CarLauncher with TaskView starts properly
Change-Id: I76f45c68bf7f9db34259bb6c2651d253505cdc6b