1133099 - [e10s] Add e10s feature detection to window.navigator

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, defect)

Description

[Bill McCloskey [inactive unless it's an emergency] (:billm)]

Attachment: e10s-feature-detect

With GDC coming up, there are probably going to be people who want to test our gaming performance in nightly. Since e10s is enabled on nightly, and some gaming features are broken in e10s (WebGL and pointer locking), those users not going to have a very good experience. The idea here is to add a short-term flag to window.navigator so that game developers can detect that nightly is running and suggest that the user switch to aurora.

Right now the way this flag works is that it's only defined on navigator if the code doing the test is running in a content process. So it's totally invisible if we're not running in e10s mode.

The name is subject to change :-). Not sure if we need a test for this.

Comment 1

[Olli Pettay [:smaug][[e-mail]]]

Please drop "F**k"

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

just navigator.e10sEnabled ?

Comment 3

[Boris Zbarsky [:bzbarsky]]

Also, why can't it just return true, given that it's only exposed in the content process?

Comment 4

[Bill McCloskey [inactive unless it's an emergency] (:billm)]

Attachment: e10s-feature-detect

New version. Here's a try push.
https://treeherder.mozilla.org/#/jobs?repo=try&revision=0df1392f6cfe

Comment 5

[Bill McCloskey [inactive unless it's an emergency] (:billm)]

https://hg.mozilla.org/integration/mozilla-inbound/rev/514a4d642fd6

Comment 6

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/514a4d642fd6