Enable Windows NV12 overlays on waterfall

We plan on shipping this via a finch experiment to Canary/Dev soon, and then
enable it by default if we don't encounter major issues. This should only affect
the DirectComposition pixel tests since we force-enable overlays for those
tests. Other tests don't exercise DirectComposition code because those code
paths are disabled unless the hardware supports it.

Bug: 869677
Change-Id: I31c1fd96f2c2567c82c19776a57b2fe18a1b1e1a
Reviewed-on: https://chromium-review.googlesource.com/1170385
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#582305}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 2be1f9128c9cf8876bc88b1cb9c946af6b235ea8
1 file changed