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The new packages are necessary to test unbundling of flac, libxslt, and zlib.

BUG=800977
R=thestig
TBR=mark

Change-Id: I2c5f88b3819ce000e906cf303fdffa30bdde84cb
Reviewed-on: https://chromium-review.googlesource.com/981451
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549303}