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This adds in both the Gtk+2 and Gtk+3 packages.

TBR=dpranke@chromium.org

Bug: 799144
Change-Id: I692e16bd62ab2120c4855cd75ce6f3260e5d6ece
Reviewed-on: https://chromium-review.googlesource.com/904856
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535457}