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This CL adds a new test to the video_encode_accelerator_tests that
tests multiple outstanding simultaneous encodes.

Bug: 1045825
Test: ./video_encode_accelerator_tests on hana
Change-Id: Iaf7be2b3292b3efd1f7d830dd2d01bd59790ce7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2251610
Commit-Queue: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792577}