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This is a dependency of the WebXR implementation. In order to support WebXR's navigator.xr.IsSessionSupported call without displaying any permission dialogue, it is necessary to have a safe way to detect the capability of running a VR or AR session without activating XR runtimes or powering on hardware. API's such as OpenVR make no guarantee that hardware and software won't be left activated after enumerating devices, so each backend in gfx/vr/service must allow for more granular detection of capabilities. By passing true to bDetectRuntimesOnly, the initialization exits early after reporting the presence of XR runtime software. The Initialize method will only enumerate hardware and possibly return true when aDetectRuntimesOnly is false. Differential Revision: https://phabricator.services.mozilla.com/D54234 --HG-- extra : moz-landing-system : lando