Android: Add --wait-for-java-debugger to test_runner.py

I used this to debug test listing in the instrumentation test runner.
This is nicer that using set-debug-app separately, because it disables
all timeouts (or else the process gets killed as you're debugging).

Change-Id: I7cd58c747534b3b539afcc84fcbae48475c4d9c3
Reviewed-on: https://chromium-review.googlesource.com/693218
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Yoland Yan <yolandyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506049}
7 files changed