Issue  4651: Mercurial support for upload.py, by Antoine Pitrou.
Issue  4651: Mercurial support for upload.py, by Antoine Pitrou.

riannucci/rietveldv2,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,riannucci/rietveldv2,nicko96/Chrome-Infra,nicko96/Chrome-Infra