Change D3D waitFence() to poll rather than wait.

Change-Id: I4931318d3ee25ec6166caceb1c5fe083d590767a
Bug: skia:9935
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/300645
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
2 files changed