restricted_trace_perf: Support multiple users This CL adds some tracking data for the current user and storage locations. It moves away from using sdcard at all. Test: restricted_trace_perf.py with non-default user Bug: b/361388557 Change-Id: Ifff9b5e4ba9b184cc5a4339417723ecb7d35a4a8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5869168 Reviewed-by: Roman Lavrov <romanl@google.com> Commit-Queue: Cody Northrop <cnorthrop@google.com>