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Set up an API to send overlay to gpu thread. This makes use of the
newly create OverlayProcessorOnGpu class.

This is CL 3/? for sending the overlay candidate directly to gpu thread.

R=rjkroege

Bug: 979788
Change-Id: Ibf1b814c5bec02b8633e3af32698f08672b533a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985302
Commit-Queue: weiliangc <weiliangc@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732615}