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system-web-apps: add a test that SWA can access sensitive directories from File Handling API

This CL adds additional test logic to check SWA can read and write to
sensitive directories (and their files) received from File Handling
API.

Fixed: 1066370
Change-Id: Ibc83d9c2c25d6a68f30afe9c802717b945050491
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129729
Auto-Submit: Jiewei Qian  <qjw@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756145}