metrics: Implement loading metric extension directory

You can now pass in --metric-extension flag to trace_processor_shell.
The flag is in the format disk_path:virtual_path.

Any internal metric proto/sql files matching the virtual_path location
is skipped. All protos in the disk_path are loaded with
"protos/perfetto/metrics/virtual_path/" location, and all SQL files are
loaded in the "virtual_path/" location.

Design doc: go/perfetto-runtime-metrics-import

Bug: 182165266
Change-Id: I6ce3d5881219e5099b6eb9c6f653b1dfded51297
14 files changed
tree: f11cdb18da48e07f8c9a69f5f882d99c3c5886f1
  1. .github/
  2. bazel/
  3. build_overrides/
  4. buildtools/
  5. debian/
  6. docs/
  7. examples/
  8. gn/
  9. include/
  10. infra/
  11. protos/
  12. src/
  13. test/
  14. tools/
  15. ui/
  16. .clang-format
  17. .clang-tidy
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. Android.bp
  23. Android.bp.extras
  24. BUILD
  25. BUILD.extras
  26. BUILD.gn
  27. CHANGELOG
  28. codereview.settings
  29. DIR_METADATA
  30. heapprofd.rc
  31. LICENSE
  32. meson.build
  33. METADATA
  34. MODULE_LICENSE_APACHE2
  35. OWNERS
  36. perfetto.rc
  37. PerfettoIntegrationTests.xml
  38. PRESUBMIT.py
  39. README.chromium
  40. README.md
  41. TEST_MAPPING
  42. traced_perf.rc
  43. WORKSPACE
README.md

Perfetto - System profiling, app tracing and trace analysis

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.