GitLab

When OverlayProcessorAndroid tries to create the gpu thread part of
processor, wait at the initialization to make it synchronous.

R=khushal

Bug: 979788, 1044671
Change-Id: I6f9c65a6710d7af30a096958b471f250b156722f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2025643
Commit-Queue: weiliangc <weiliangc@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737041}