gn: upgrade libprotobuf to v3.20.3 This matches Chromium's revision. Also fix a bunch of issues in the codebase as a result of this change including positively removing a bunch of warning cflags which protobuf no longer trips Change-Id: If18b121898ec4d0198dff49db9a0727a011f9a36
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.