Add pgo builders for alex and lumpy.
Add pgo builders for alex and lumpy.

BUG=chromium-os:29829
TEST=unittests

Change-Id: Ibb6da5cf494d6d3a86d85dec39ddceddf5f6ae92
Reviewed-on: https://gerrit.chromium.org/gerrit/36733
Reviewed-by: Chris Sosa <959d3d631fb6f17f1b07f751372041a1edb210d1@chromium.org>
Tested-by: Peter Mayo <3d31fdaf44dc55bb1b4f50b19df9bc879177d37a@chromium.org>

chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,zhang0137/chromite,coreos/chromite,coreos/chromite,zhang0137/chromite,zhang0137/chromite