packages.proto: Add chrome internal flag as boolean option.

BUG=chromium:1034706
TEST=./generate.sh

Change-Id: I6961f30b1c2dfb8b045a6d04fa7ab78bcba55102
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/1970494
Tested-by: Alex Klein <saklein@chromium.org>
Auto-Submit: Alex Klein <saklein@chromium.org>
Reviewed-by: David Burger <dburger@chromium.org>
Commit-Queue: Alex Klein <saklein@chromium.org>
3 files changed