Viewer builds (for Windows) with GN

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3599

Change-Id: Id6a142f90f544bef266d78e385f22e17288d5064
Reviewed-on: https://skia-review.googlesource.com/3599
Reviewed-by: Mike Klein <mtklein@google.com>
7 files changed