diff --git a/Cargo.lock b/Cargo.lock
index 562456fece0..5eb3242356c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6391,7 +6391,7 @@ dependencies = [
 [[package]]
 name = "webxr"
 version = "0.0.1"
-source = "git+https://github.com/servo/webxr#29f4f1f28695553c45d6c020172048c0035c49ed"
+source = "git+https://github.com/servo/webxr#b223bc02b04c8ce0905f34a58802af323457bef4"
 dependencies = [
  "bindgen",
  "euclid",
@@ -6403,6 +6403,7 @@ dependencies = [
  "serde",
  "surfman",
  "surfman-chains",
+ "time",
  "webxr-api",
  "winapi",
  "wio",
@@ -6411,7 +6412,7 @@ dependencies = [
 [[package]]
 name = "webxr-api"
 version = "0.0.1"
-source = "git+https://github.com/servo/webxr#29f4f1f28695553c45d6c020172048c0035c49ed"
+source = "git+https://github.com/servo/webxr#b223bc02b04c8ce0905f34a58802af323457bef4"
 dependencies = [
  "euclid",
  "ipc-channel",
diff --git a/components/script/dom/xrsession.rs b/components/script/dom/xrsession.rs
index bab52ab326f..6b945d5f8fd 100644
--- a/components/script/dom/xrsession.rs
+++ b/components/script/dom/xrsession.rs
@@ -43,6 +43,7 @@ use dom_struct::dom_struct;
 use euclid::{Rect, RigidTransform3D, Transform3D};
 use ipc_channel::ipc::IpcSender;
 use ipc_channel::router::ROUTER;
+use metrics::ToMs;
 use profile_traits::ipc;
 use std::cell::Cell;
 use std::mem;
@@ -72,7 +73,7 @@ pub struct XRSession {
     #[ignore_malloc_size_of = "closures are hard"]
     raf_callback_list: DomRefCell<Vec<(i32, Option<Rc<XRFrameRequestCallback>>)>>,
     #[ignore_malloc_size_of = "defined in ipc-channel"]
-    raf_sender: DomRefCell<Option<IpcSender<(f64, Frame)>>>,
+    raf_sender: DomRefCell<Option<IpcSender<Frame>>>,
     input_sources: Dom<XRInputSourceArray>,
     // Any promises from calling end()
     #[ignore_malloc_size_of = "promises are hard"]
@@ -300,7 +301,7 @@ impl XRSession {
     }
 
     /// https://immersive-web.github.io/webxr/#xr-animation-frame
-    fn raf_callback(&self, (time, mut frame): (f64, Frame)) {
+    fn raf_callback(&self, mut frame: Frame) {
         debug!("WebXR RAF callback");
 
         // Step 1
@@ -333,6 +334,8 @@ impl XRSession {
 
         // Step 4-5
         let mut callbacks = mem::replace(&mut *self.raf_callback_list.borrow_mut(), vec![]);
+        let start = self.global().as_window().get_navigation_start();
+        let time = (frame.time_ns - start).to_ms();
 
         let frame = XRFrame::new(&self.global(), self, frame);
         // Step 6,7