Add Win OpenCL Build job.

Bug: skia:8081
Change-Id: Ibcb82389668bd9ea7395e498696417d5701761c0
Reviewed-on: https://skia-review.googlesource.com/140782
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
8 files changed