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WaitForVBlank can fail if D3D11 device is lost.

Also use InMillisecondsRoundedUp in fallback Sleep() call to match
PostDelayedTask() behavior.

Bug: 953970
Change-Id: I129a93b41be553f184682e09b21f83ca8d3aedb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618264Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661113}