GitLab

This will allow to add sections dependant on gn flags
and ensure that flags and blank lines stay at the end.

Bug: 1017434
Change-Id: Ia982cb84f4092631ba6dd7c0b14063290db773fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159243
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760947}