Bug 304062 – [WebDriver][BiDi] Implement script.realmCreated and script.realmDestroyed events

• Status: RESOLVED
• Resolution: FIXED
• Component: WebDriver

[Serge Deh]

WebKit does not emit script.realmCreated and script.realmDestroyed events when JavaScript realms are created or destroyed during navigation.

Per the WebDriver BiDi specification, these events should be emitted to notify clients when realm lifecycle changes occur:
https://w3c.github.io/webdriver-bidi/#event-script-realmCreated
https://w3c.github.io/webdriver-bidi/#event-script-realmDestroyed

This prevents BiDi clients from tracking realm changes without polling script.getRealms.

Example expected behavior:
- Navigate to a page -> script.realmCreated emitted
- Navigate away -> script.realmDestroyed emitted for old realm, realmCreated for new
- Close context -> script.realmDestroyed emitted

Initial implementation will cover window realms for main browsing contexts. Workers and iframes will be addressed in follow-up work.

See also: bug 303926 (script.getRealms implementation)

[Radar WebKit Bug Importer]

<rdar://problem/166875337>

[EWS]

Committed 310527@main (ccec5e43c699): <https://commits.webkit.org/310527@main>

Reviewed commits have been landed. Closing PR #55793 and removing active labels.

[EWS]

Committed 310738@main (6a6a378761be): <https://commits.webkit.org/310738@main>

Reviewed commits have been landed. Closing PR #58221 and removing active labels.