Add a Windows Android builder.

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4320

Change-Id: Ifd693f5de978565f694bc0173a1248e705303e68
Reviewed-on: https://skia-review.googlesource.com/4320
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
5 files changed