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The Chrome OS HAL VideoCaptureDevice receives the captured data through
DMAbuf.  On certain platforms the DMAbuf are allocated under some
alignment constraints, e.g. on Intel platform the buffer plane width is
aligned to 64.  Hence when mapped to CPU the memory planes are not
contiguous so directly calling libyuv::ConverToI420() with the buffer
address and size does not work.

BUG=b:78259838
TEST=Make sure camera preview with resolution 2592x1944 displays
     correctly on DUT.

Change-Id: I85cf4fadf24a9374ee837e820dbd89881d14f475
Reviewed-on: https://chromium-review.googlesource.com/1029935
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555386}