This appears to be a very old wrapper around adb for testing on
Android before we had the go_android_exec wrapper.

Change-Id: I847bb15c98febbcffc063f00719a084e5c99a18b
Reviewed-on: https://go-review.googlesource.com/c/go/+/493604
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>