Bug 1686802 - Expose OMTP status to telemetry. r=aosmond

Differential Revision: https://phabricator.services.mozilla.com/D101858

widget/GfxInfoBase.cpp

@@ -1655,6 +1655,10 @@ void GfxInfoBase::DescribeFeatures(JSContext* aCx, JS::Handle<JSObject*> aObj) {
       gfxConfig::GetFeature(gfx::Feature::OPENGL_COMPOSITING);
   InitFeatureObject(aCx, aObj, "openglCompositing", openglCompositing, &obj);
 
+  gfx::FeatureState& omtp =
+      gfxConfig::GetFeature(gfx::Feature::OMTP);
+  InitFeatureObject(aCx, aObj, "omtp", omtp, &obj);
+
   // Only include AL if the platform attempted to use it.
   gfx::FeatureState& advancedLayers =
       gfxConfig::GetFeature(gfx::Feature::ADVANCED_LAYERS);