Brings support for '.' in package names.

R=iannucci@chromium.org
BUG=800618

Change-Id: I36fd31b0576e002da8d58d7e611742c0aa0b0b57
Reviewed-on: https://chromium-review.googlesource.com/861259Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>