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The creation of OverlayProcessorOnGpu is not synchronous, and we might
try to use it before the task is run on the gpu thread. Make sure to
wait for the creation if we try to use it.


R=rjkroege

Bug: 1044671
Change-Id: I9c9f02368ab36b3e328a525612f4fbd481e6df97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2015345
Commit-Queue: weiliangc <weiliangc@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735076}