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Also, adds win7 32-bit testers to test these builds.

Bug: 1151458
Change-Id: Iaacac3d1e0ecf4336cf0c9f29cb2be12973ee109
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552944
Commit-Queue: Anjali Doneria <adoneria@google.com>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830783}