add fast Win clang bot

Change-Id: Id6a5155d0e5b34d8c5f8553e2ee4542e9be810cc
Reviewed-on: https://skia-review.googlesource.com/117922
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed