YUV-format image scaling and conversion library

The source in this directory was copied from upstream by running the
update.py script from media/libyuv. Any changes made relative to upstream
should be reflected in that script, e.g. by applying patch files after the
copy step.

The upstream repository is https://chromium.googlesource.com/libyuv/libyuv
Updates before this file was added were done manually; the last import was
r1602 (svn).

The git commit ID last used to import was 054ec37f8e31e6131c8f19eb74395d29009d6604 (2017-02-21 23:59:57)
