ignore generated files

BUG=chromium:660209
TEST=`git status` is clean

Change-Id: I94075da61c654bc1d6eb6c66df34cbc7eb5b4d54
Reviewed-on: https://chromium-review.googlesource.com/404029
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
1 file changed