Pointing ray no longer assumed to be static

In OpenXR, the aim ray is not static. Thus it must be recomputed regularly
in order to support devices with dynamic aim ray poses.

This change removes the check that prevented the recomputation of the aim
ray pose.

Change-Id: I4c3fdf423387a784ce92c8658e8462dd3e598592
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308947Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Lachlan Ford <laford@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#790461}

device/vr/openxr/openxr_controller.cc

@@ -236,10 +236,8 @@ mojom::XRInputSourceDescriptionPtr OpenXrController::GetDescription(
         path_helper_->GetInputProfiles(interaction_profile_);
   }
 
-  if (!description_->input_from_pointer) {
-    description_->input_from_pointer =
-        GetPointerFromGripTransform(predicted_display_time);
-  }
+  description_->input_from_pointer =
+      GetPointerFromGripTransform(predicted_display_time);
 
   return description_.Clone();
 }