This is a reland of 797d74a2

Original change's description:
> vpython: Specify interpreter to run.
> 
> Specify the interpreter to run to avoid issues with several
> python installations on Windows.
> 
> Bug: 1036606
> 
> Change-Id: Ib70d041acc52c940711460219acd8f4ad58637a9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1992608
> Reviewed-by: Anthony Polito <apolito@google.com>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

Bug: 1036606
Change-Id: Ibf6727249b40c5a9f5f877353c8d42fe66404cf8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1994215Reviewed-by: Anthony Polito <apolito@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>