Intent to Implement and Ship: PerformanceObserver inside Worker

[n...@chromium.org]

Contact emails

n...@chromium.org  igri...@chromium.org

Spec

https://w3c.github.io/performance-timeline/

TAG review: https://github.com/w3ctag/design-reviews/issues/18

Summary

Expose PerformanceObserver interface within Worker.

Motivation

We already ship workers with Performance. The Performance Observer is a newer addition with certain advantages, but we currently only support it on Window.

Interoperability and Compatibility Risk

Low risk here since we already ship window support.

Edge: Public support, not yet supported.

Firefox: Supported as experimental for window and worker.

Safari: Supported

Web developers: Positive

Ongoing technical constraints

None

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

Windows, Mac, Linux, Chrome OS.

Is this feature fully tested by web-platform-tests?

There are several tests. Some are marked as failure even for the window version. The following pass with window and the worker versions should be enabled when this feature ships:

external/wpt/performance-timeline/po-getentries.any.worker.html

external/wpt/performance-timeline/po-mark-measure.any.worker.html

external/wpt/performance-timeline/po-observe.any.worker.html

external/wpt/performance-timeline/po-entries-sort.any.worker.html

OWP launch tracking bug

747457

Link to entry on the feature dashboard

Fits under the existing feature for Performance Observer.

Requesting approval to ship?

Yes

[Chris Harrelson]

LGTM1

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[mk...@chromium.org]

LGTM2. This doesn't expose any information that isn't already exposed to windows, and aligning the behavior with Firefox's nascent implementation seems reasonable.

[Rick Byers]

LGTM3

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