shell-encryption: Add base test runner for SHELL unit tests

As SHELL tests are going to be always enabled on some bots, it needs to
use base test_runner.

This CL is adding the support of using base test_runner for SHELL.

BUG=chromium:1151230

Change-Id: I4d059d7bc30878013e5058349af8743b2fa0aec5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560207
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Amr Aboelkher <amraboelkher@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#832079}
GitOrigin-RevId: 3af4efe76cf2e9996352fba0a1c62281fd9c8a71
3 files changed