GitLab

Package configurations do not change at run-time, so cache it the first
time it is read, to avoid the cost of repeatedly re-reading it from the
filesystem.

Change-Id: I53c6ea55be5fca48bf3c81f189e251d8a11a55a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135607
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756349}