If the --gs_results_bucket option is provided the results are uploaded to Google storage, which is good for trybot results. However it would also be handy to allow a developer to get the screenshots directly.

The render tests are run locally and the outputs get put into render_test_output_dir which is removed once the tests are run [1].

We could not delete this directory after running the tests and allow the developer to pull the images off the device manually - potentially clearing that directory before running tests so images from different test runs are not mixed.

Alternatively, we could pull the images to the computer (similar to how screenshot_dir works).

[1] - https://cs.chromium.org/chromium/src/build/android/pylib/local/device/local_device_instrumentation_test_run.py?l=408