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This uses //build/android's result_sink.py to upload Tast results to
RDB. It attaches any file artifact for a given test that Tast produces.

Bug: 1129654
Change-Id: I8f00cbe5b03521d7875d66c062d5832be80caa6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504493Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821863}