[wptrunner] Collect per-test trace events from Chromium#54366
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jonathan-j-lee merged 1 commit intoweb-platform-tests:masterfrom Aug 19, 2025
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When `wpt run --trace-categories` is specified, the trace events [0] are retrieved from an internal ChromeDriver buffer and logged as an `extra` test result field. The trace will be consumed by an event listener on the Chromium side (https://crrev.com/c/6820247) and can be viewed in https://ui.perfetto.dev/. Partially fulfills crbug.com/434017035 [0]: https://developer.chrome.com/docs/chromedriver/logging/performance-log
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I tested this both locally in ./wpt run -y chrome infrastructure --metadata infrastructure/metadata --trace-categories=blink.bindings... and in Chromium CI, for both The CI failures are likely unrelated to the PR (#51981 and #54364). |
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The option works like its `run_web_tests.py` counterpart, except the categories are configurable and the trace is in JSON format. The trace events are retrieved from an internal ChromeDriver buffer and written to `layout-test-results/external/wpt/.../test-trace.json`, where they can be downloaded from the results viewer. See web-platform-tests/wpt#54366 for the upstream change this CL depends on. Bug: 434017035 Change-Id: I49195559e4fca6ce54da4428ec26f3fe528eb2bc Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6820247 Reviewed-by: James Scott <jamescscott@google.com> Commit-Queue: Jonathan Lee <jonathanjlee@google.com> Cr-Commit-Position: refs/heads/main@{#1505149}
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When
wpt run --trace-categoriesis specified, the trace events are retrieved from an internal ChromeDriver buffer and logged as anextratest result field. The trace will be consumed by an event listener on the Chromium side (https://crrev.com/c/6820247) and can be viewed in https://ui.perfetto.dev/.Partially fulfills https://crbug.com/434017035