tracing: Distinguish between global and per-thread default track Make it possible to use perfetto::Track::Global(0u) to signify the default global track without actually emitting an event on the thread's default track Bug: crbug.com/1006541 Change-Id: I916a0ba025e992a2d91cf8b671fa8e472acb0ee5
Perfetto is a production-grade open-source stack for performance instrumentation and trace analysis. It offers services and libraries and for recording system-level and app-level traces, native + java heap profiling, a library for analyzing traces using SQL and a web-based UI to visualize and explore multi-GB traces.
See https://perfetto.dev/docs or the /docs/ directory for documentation.