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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/+/1972753Reviewed-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}