- Merge CheckCallAndFilter[AndHeader]
- print_stdout will cause command output to be redirected to sys.stdout.
- Made compatible with Python 3.

Bug: 984182
Change-Id: Ida30e295b872c8c1a1474a376a90aecea924f307
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1727404
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>