infra_paths: enable persistent cache also on Mac
infra_paths: enable persistent cache also on Mac

BUG=584079, 459840, 593999, 596887

Review-Url: https://codereview.chromium.org/2095333002

CoherentLabs/depot_tools,primiano/depot_tools,CoherentLabs/depot_tools,primiano/depot_tools,primiano/depot_tools