[windows] dogfood python 2.7.5 in depot_tools

[Marc-Antoine Ruel]

Still on Windows? Want to dogfood? Then run:

  set DEPOT_TOOLS_PYTHON_275=1

  gclient

Soon the update will be automatic but I want to have people dogfood it a bit before.

The prepackaged 2.7.5 has pip, pywin32 and psutil preinstalled. pip is not added in PATH so cd to the ...\depot_tools\python275_bin\Scripts directory first:

  X:\foo\depot_tools\python275_bin\Scripts>pip list

  pip (1.4.1)

  psutil (1.1.1)

  pywin32 (218)

  setuptools (1.1.6)

If anything gets messed up, unset the environment variable and delete python.bat. It'll start over with 2.6.

Please email me directly about any issue.

Note: slaves are still on 2.6, it's not the time to go and spray the code with argparse, collections.OrderedDict or assertRaisesRegexp, yet.

Thanks,

M-A