Add AFDO generation scripts

People want to generate AFDO profiles, which is a somewhat error-prone
and complicated process for a few reasons. So, have two scripts.

The first of these allows you to easily generate an AFDO perf profile on
a trybot. The second gives you a convenient way to turn that into an
AFDO profile. Both have accompanying documentation, so the hope is that
they're usable.

BUG=None
TEST=None

Change-Id: I4afb665ffc8550c718b3867ca3d5b98aa4cd0901
Reviewed-on: https://chromium-review.googlesource.com/1526721
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
2 files changed