virtual/target-chromium-os-sdk: Add media-gfx/pngcrush to the host.

pngcrush is required to re-encode the recovery .png localized messages.

CQ-DEPEND=CL:259917
BUG=chromium:465647
TEST=`./update_chroot` installs pngcrush.

Change-Id: Iee3be14240fa799b91e29689c818c6011cae47b0
Reviewed-on: https://chromium-review.googlesource.com/260012
Trybot-Ready: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
(cherry picked from commit 9eb4881aab011998d833f5cf52a7baf70e73a204)
Reviewed-on: https://chromium-review.googlesource.com/261987
Reviewed-by: Patrick Sosinski <sosinski@google.com>
Commit-Queue: Patrick Sosinski <sosinski@google.com>
Tested-by: Patrick Sosinski <sosinski@google.com>
2 files changed