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This is a reland of 8e917b47

Original change's description:
> [code coverage] Bot definitions for Windows coverage tryjob
> 
> Add definitions for tester machines for Windows coverage.
> 
> Add buildbot definitions so the tryjob can run tests.
> 
> Bug: 1033753
> Change-Id: I3d933b1beaedd24ad206c9e5d2528ed5e4496b67
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972753
> Reviewed-by: Nodir Turakulov <nodir@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
> Commit-Queue: Sajjad Mirza <sajjadm@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#726609}

Bug: 1033753
Change-Id: Iff0f570f0a1c2853a2de129f6469402ed5843500
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977836
Commit-Queue: Sajjad Mirza <sajjadm@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Auto-Submit: Sajjad Mirza <sajjadm@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726687}