This is to know what build configs are popular among chromium developer.

Bug: 900161
Change-Id: Id07722e70fc407b3f8668080d49033da6e1a7f34
Reviewed-on: https://chromium-review.googlesource.com/c/1358034
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Shinya Kawanaka <shinyak@chromium.org>
Reviewed-by: Fumitoshi Ukai <ukai@chromium.org>