[Worker] Test making multiple async FileSystem operations.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

Starting worker: ../resources/async-operations.js
[Worker] requested FileSystem.
[Worker] Got FileSystem:file__0:Temporary
[Worker] Starting async test stage 1.
[Worker] Starting async test stage 2.
[Worker] Verifying the FileSystem status.
PASS [Worker] "/a,/b,/c,/d2,/e,/f" is "/a,/b,/c,/d2,/e,/f"
PASS [Worker] dirsCount is 3
PASS successfullyParsed is true

TEST COMPLETE