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When importing a buffer, the provided buffer's size may differ from the
size we requested from ProvidePictureBuffersWithVisibleRect(). We
already accounted the width difference, but not the height, which
resulted in green lines being visible when the provided buffer differed
in height, and was single-planar: the image processor would render using
the assumed height, while the GPU would render using the real height,
resulting in the color plane being offset by one or two lines.

Since the VDA and SVDA both need to do this, factorize the actual buffer
size's computation code into a VDA helper, and call it from both.

BUG=chromium:982172
BUG=b:141579960
BUG=b:146599071
BUG=b:141965953
TEST=Youtube playing in 240, 360, 480 and 720p on desktop and Android
with Hana, Krane and Kevin. No artefact or green line visible.

Change-Id: I0e28446805fd382cbe0d3aab30b704c85ca52b72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2011784
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733899}