platform: graphics: add perfetto tracing script

BUG=b:147789115
TEST=run script with connected DUT

Change-Id: I1692a1f85921ea25f34363d301bea0600c55fb96
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/graphics/+/2995108
Tested-by: John Bates <jbates@chromium.org>
Auto-Submit: John Bates <jbates@chromium.org>
Reviewed-by: David Riley <davidriley@chromium.org>