GitLab

From this CL, the test evaluates the stream quality by the
average of SSIM of the frames. Additionally this CL also cleans
up the code of initializing validators and enables to dump
bitstream even if --disable-validator.

Bug: 1045825
Test: video_encode_accelerator_tests on rammus
Change-Id: Ie6fb22eed130dee0e4181a9bc3b2679cc4db6623
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359817
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800049}