UI: Add initial puppeteer-based integrationtests

This CL introduces support for UI integrationtests.
Those tests are based on puppeteer (Chrome headless)
and work by injecting user actions into the real UI,
capturing screenshots and diffing them against
reference ones.

Each test() unit in ui_integrationtests.ts automatically
captures and diffs the screenshot at the end of the run.
In case of failures, diffs are uploaded to the CI GCS
bucket (gs://perfetto-ci-artifacts/$key/).

I got to a state where tests can be run both on Linux
and Mac successfully. There are few rendering differences
between the two, due to the fact that font rendering
seems platform specific. But with enough tweaks the
difference can be contained to sub-pixel antialiasing
and can be dealt with a threshold in the diff algorithm.

Bug: 190075400
Change-Id: I5fb35c41ba5f95a4761465b9d0128edd92414510
19 files changed
tree: 1cd38b085705a8afe85025dd49f0f139d778285f
  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.