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Video::Decode() decodes compressed videos and fills decoded frames
to the buffer. Originally, the plane size of filled frames is
computed by VideoFrame::PlaneSize().GetArea(). However, this
aligns resolutions by two and thus the computed plane size is not
the succinct area. For instance, when a resolution is 641x361,
PlaneSize().GetArea() returns 232404=642x362 for the first plane,
but the test demands a plane size is 231401=641x361. This CL
fixes the mismatch.
This enables video_encode_accelerator_tests to run odd resolution
videos.

Bug: b:174318867
Test: video_encode_accelerator_tests crowd-641x361.vp9.webm --codec=vp9 on atlas
Change-Id: I5d2d9fa31ae838abd501e60e19509d667f70821c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2563186
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834128}