A recent change in Chromium broke how we were parsing stdout for
capturing system info on Android. Fix the break and also update
some helper scripts to work better when run manually.

Bug: angleproject:5261
Change-Id: Iecc00bbe540461ab50ea31b5245b8b38a7250956
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2507633Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>