Bug 827446 introduced mozcrash, automation.py cannot import mozcrash resulting in PGO build failure. steps to reproduce 1) build calls profileserver.py, which relies on automation.py 2) automation.py cannot import mozcrash 3) PGO build fails. I'm using VS 2012. in Bug 827446 RyanVM encountered an almost identical issue but it appears to have been ignored.
talked with jmaher, pgo needed to be change to pgo-profile-run instead of the old python method.
I updated the docs here: https://developer.mozilla.org/en-US/docs/Building_with_Profile-Guided_Optimization