Can't enter immersive babylon goalie demo: "SecurityError: The operation is insecure."

[jdm]

joshmatthews@joshmatthews-fcmd6r servo-master % ./mach run https://servo.org/hl-home/
Babylon.js v4.2.0-alpha.5 - WebGL1
[2020-03-24T20:57:15Z ERROR canvas::canvas_data] Unimplemented canvas2d.fillText. Values received: Goalie Trainer, 512, 496.5, None.
[2020-03-24T20:57:15Z ERROR canvas::canvas_data] Unimplemented canvas2d.fillText. Values received: Easy, 512, 554.25, None.
[2020-03-24T20:57:15Z ERROR canvas::canvas_data] Unimplemented canvas2d.fillText. Values received: Hard, 512, 634.25, None.
SecurityError: The operation is insecure.
The operation is insecure.

This is what appears when I click the button to enter immersive mode after loading https://servo.org/hl-home/bbjs/#PPM311#63 on desktop macOS.

[jdm]

frame #3: 0x0000000102b836c8 servo`_$LT$script..dom..xrsystem..XRSystem$u20$as$u20$script..dom..bindings..codegen..Bindings..XRSystemBinding..XRSystemBinding..XRSystemMethods$GT$::RequestSession::hbea2fec005def977(self=&0x16eaebcc0, mode=Immersive_vr, init=RootedTraceableBox<script::dom::bindings::codegen::Bindings::XRSystemBinding::XRSessionInit> {
ptr: &0x179d5f6e0
}, comp=InRealm {

}) at xrsystem.rs:186:17
   183
   184 	        if mode != XRSessionMode::Inline {
   185 	            if !ScriptThread::is_user_interacting() {
-> 186 	                promise.reject_error(Error::Security);
   187 	                return promise;
   188 	            }
   189

[jdm]

The call stack shows that this is invoking xr.requestSession from a promise microtask, so we need to propagate the user interaction flag through callbacks appropriately:

• https://searchfox.org/mozilla-central/source/dom/promise/Promise.cpp#101-109
• https://searchfox.org/mozilla-central/source/js/public/Promise.h#494-513

[jdm]

This also affects the drumming demo.

[paulrouget]

Why does it not happen on HL? The way the button is clicked?

[paulrouget]

Same with timers (setTimeout/setInterval) apparently.