added packages to python requirements file BUG=chromium:322308 TEST=run_all_test.py Change-Id: I5a7c829b7266085da2c6760de51e771a599bebda Reviewed-on: https://chromium-review.googlesource.com/177712 Reviewed-by: Byron Kubert <byronk@chromium.org> Commit-Queue: Byron Kubert <byronk@chromium.org> Tested-by: Byron Kubert <byronk@chromium.org>