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Plumb callback and results between viz compositor and gpu threads.

Bug: 982842
Change-Id: I1225757d42f4fc80a35ee556a76f401137971ff1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819621Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699025}