The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/portage-stable/+/7d02c64082e1ec138118f76dd93a710a5d834853

commit 7d02c64082e1ec138118f76dd93a710a5d834853
Author: Dean Liao <deanliao@chromium.org>
Date: Thu Nov 30 09:13:17 2017

Add dev-python/pbr package.

dev-python/pbr is needed for dev-python/mock-2.0.0

Change from upstream:
* EAPI 6 -> 5
* KEYWORDS="*"

BUG= chromium:789389 
TEST=emerge-$BOARD dev-python/pbr

Change-Id: I02f0d329492a13946fdaf7a1d11311f675a6ba61
Reviewed-on: https://chromium-review.googlesource.com/795517
Commit-Ready: Shuo-Peng Liao <deanliao@chromium.org>
Tested-by: Shuo-Peng Liao <deanliao@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

[add] https://crrev.com/7d02c64082e1ec138118f76dd93a710a5d834853/dev-python/pbr/Manifest
[add] https://crrev.com/7d02c64082e1ec138118f76dd93a710a5d834853/dev-python/pbr/pbr-3.1.1.ebuild