Skip non-D3D11 test contexts on Windows-on-ARM bots

The device only has D3D11 (no D3D9 or GL), so every unit test
failed to create three of the five context types. This wasn't
causing actual problems, but was filling the logs with a huge
amount of noise.

Bug: skia:9275

Change-Id: I78068b16a56918bc7dba2862834996fb07050438
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/229487
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed