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Use libyuv::I420AlphaToARGBMatrix() to convert 8-bit YUV 4:2:0 with
alpha to ARGB for all four color spaces. The libyuv::I420AlphaToARGB()
function we used before only works for the BT.601 color space.

Change-Id: I35e714c26cd2930a9d6e5cb8276a8ceb221a2632
Bug: 1098541
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261482
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822819}