Add android_run_app.go

Launches an app, pipes its output, and exits when the app exits.

Loosely based on the old buildbot code in python:
https://skia.googlesource.com/buildbot/+/ac0663c599a443a4958c8cad5aefd25eb09eff58/slave/skia_slave_scripts/utils/android_utils.py

BUG=skia:4093

Review URL: https://codereview.chromium.org/1256353002
1 file changed