Add a small unit test that dumps system info. We can use this in the trace gold tests to identify system properties. The test uses Vulkan info collection when available and dumps out the known GPU info as JSON. Bug: angleproject:4090 Bug: b/168049670 Change-Id: Ib8d2244d82b650b94818da30adab180b471af556 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2427872 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com>