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User-allocated memory can be passed to some hardware (like video
encoder). Such hardware is generally not happy if the memory is not
page-aligned. This patch adds a new member to VideoFrameLayout that
specifies the desired alignment of the buffer, and make VideoFrame
comply to it when allocating memory. It also makes use of it by
specifying a page-alignment to formats returned by V4L2Device.

Other users of VideoFrame/VideoFrameLayout are not affected by this
CL.

BUG=b:80274650
TEST=Made sure the VEA unittest was working on Hana and Cheza.

Change-Id: Id615ca1ba3f9b253ba774573146a3428c144f57f
Reviewed-on: https://chromium-review.googlesource.com/c/1154769
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608280}