Intent to Implement and Ship: toJSON for worker Performance and certain PerformanceEntries

[n...@chromium.org]

Contact emails

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

Spec

https://w3c.github.io/performance-timeline/#the-performanceentry-interface 

https://www.w3.org/TR/hr-time-2/#the-performance-interface 

Summary

Ever since WebIDL was deprecated in favor of toJSON [1], the Performance and PerformanceEntry specs added a mandatory toJSON method. This method should just call the default toJSON operation [2].

[1] https://github.com/w3c/resource-timing/issues/112 

[2] https://heycam.github.io/webidl/#default-tojson-operation 

The following interfaces will have toJSON added:

PerformanceResourceTiming

PerformanceLongTaskTiming

TaskAttributionTiming

Performance within Worker

Motivation

Allow developers to aggregate PerformanceEntries in JSON.

Interoperability risk: none

Firefox: Shipped

Edge: Public support

Safari: Shipped

Web developers: Positive

Compatibility risk: none

Ongoing technical constraints: none

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux,

Chrome OS, Android, and Android WebView)? Yes.

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

There are some tests for existence, like external/wpt/resource-timing/idlharness.html and external/wpt/hr-time/idlharness.html

Tests for correctness are missing, I shall be adding some shortly. See for instance this issue: https://github.com/w3c/user-timing/issues/29

OWP launch tracking bug: none

Link to entry on the Chrome Platform Status

https://www.chromestatus.com/features/6730557958389760 

Requesting approval to ship?

Yes

[Chris Harrelson]

LGTM1

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[Yoav Weiss]

LGTM2

LGTM1

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[Rick Byers]

LGTM3

LGTM2

LGTM1

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