Investigate offscreen cameras. #9166

Job	Run time
examples-rl (e10_drive)	7m 53s
examples-rl (e11_platoon)	4m 21s
base-tests (./cli)	4m 10s
benchmark (e10_drive)	5m 21s
benchmark (e11_platoon)	3m 17s
base-tests (./envision)	4m 28s
base-tests (./smarts/core --nb-exec-timeout 65536 --ignore=./smarts/core/tests/test_notebook.py)	4m 26s
base-tests (./smarts/env --ignore=./smarts/env/tests/test_rllib_hiway_env.py)	4m 27s
base-tests (./smarts/env/tests/test_rllib_hiway_env.py)	4m 25s
base-tests (./smarts/sstudio)	4m 19s
base-tests (./smarts/ray)	4m 26s
base-tests (./examples/tests/test_examples.py)	4m 28s
	56m 1s

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