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If disabled tests run, test launcher was flagged to run them explicitly.
Since we will remove the MANUAL_ flag, we should track the results.

Instead of testing test result tracker procedurally,
We use test launcher unit tests for functional testing.

Bug: 936248
Change-Id: Iafb2d40a9c650964097cd3f1136d6a5012afda3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1641805
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666438}