GitLab

Header files should be listed in the sources list, so gn analyze
can work.

https://docs.google.com/spreadsheets/d/15az3FMl-jAS0mx4E9XVSBVHVpmEzo-9EAGY0ywe7bZs/edit#gid=0

https://groups.google.com/a/chromium.org/d/topic/chromium-dev/1kK45mVemBc/discussion

BUG=661774
TBR=jamescook@chromium.org

Change-Id: I68020668044858be898ce6d18392ee8610cf22f4
Reviewed-on: https://chromium-review.googlesource.com/531030
Commit-Queue: Thiago Farina <tfarina@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478819}