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PSNR and SSIM are popular image quality estimations. This CL adds
functions to compute PSNR and SSIM using libyuv.

Bug: 1044452
Test: None
Change-Id: Ied55ad80b005fce274b66faaf2f395027353ec9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023714
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744578}