Create a script to make it easier to update WPR stories

Based on original script written by cbruni@chromium.org.

This CL implements the live command only, but further modes will be added in
follow-up CLs.

R=perezju@chromium.org

Bug: 895891
Change-Id: I8a3b7f8f665662f2150c2e91f3414e05ab9734e3
Reviewed-on: https://chromium-review.googlesource.com/c/1454531
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Auto-Submit: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632575}
6 files changed