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This class is an optimized way to share an egl fence
among multiple consumers. Once the shared egl fence
has been waited upon by any of the consumer, all the
future waits to the same fence becomes no-op since we
don't need to wait again on the same fence any more.
This saves un-neccesary gl calls issued to do wait by
each consumer.

Change-Id: I5bf0c0f9a36d2d1a2709100343a141ec8b841dae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1989025
Commit-Queue: vikas soni <vikassoni@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731779}