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For Andorid Pre-SurfaceControl, overlay processor can send the
overlay candidates directly.

This is CL 6/? for sending the overlay candidates directly to gpu thread.

R=rjkroege

Bug: 979788
Change-Id: I76d97e8c8cfece078f6ea8d90bf8d3e7ae02dbfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985305
Commit-Queue: weiliangc <weiliangc@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733619}