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This CL adds requests queue to FrameInfoHelperImpl to make sure all
requests are ordered to keep VideoFrameFactoryImpl pipeline ordered.

Before this change VFFI would cache FrameInfo to avoid thread hops to
GPU thread and it was possible that some CreateVideoFrame requests will
be completed out-of-order.

After this change VFFI doesn't cache FrameInfo and always call
FrameInfoHelper. FrameInfoHelper does all necessary caching to avoid
unnecessary hops to GPU thread and guarantees that callbacks with
FrameInfo will come in order.

Change-Id: Iacb63cf3746991c911f1f0d5e3667db3dbd56c68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304092
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790127}