run_asan: New script to run a SyzyASan chrome.
crbuild: Support ASAN building for Windows.

See https://code.google.com/p/sawbuck/wiki/SyzyASanHowTo
crbuild: Disable color output on Windows.

Neither cmd.exe nor PowerShell seem to support color (at least how crbuild
outputs it.)
crbuild: Explicit Python invocation.

Windows shells don't supprot shebang.