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Exercise the basic API (create, get, close).

This test depends on the parent CL which adds the API for
GetDisplayedNotifications.

Bug: 1134389
Test: lacros_chrome_browsertests
Change-Id: Ia8da142ee0f0ee60af2664098ebd11dc06a2a1f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445851
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813354}