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Currently, if a pixel test is flaky(failing->passing) on CQ, Skia Gold
will send out a gerrit comment about test failure. We don't want that
since the test finally passed. The comment should only get sent out
when the test is deterministic failure.
But on Skia Gold side, there's no way to know how many retry we have.
To resolve this, we need the test to know if this is the last retry.
If it is and the test is failing, the test can tell Gold to send out
gerrit comment.

Bug: 1139468
Change-Id: I68f9f47afc444227b285d6eae14c96854c79b62c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486391Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821868}