Wire up cursor proxy on MUS

ui/ozone/platform/drm/mus_thread_proxy.cc

Index: ui/ozone/platform/drm/mus_thread_proxy.cc
diff --git a/ui/ozone/platform/drm/mus_thread_proxy.cc b/ui/ozone/platform/drm/mus_thread_proxy.cc
index d3bacc4f7bbaec820c26766475797639ed52d6d3..1f3e0167e206cbcbf3de310187ded00b0b9bb13e 100644
--- a/ui/ozone/platform/drm/mus_thread_proxy.cc
+++ b/ui/ozone/platform/drm/mus_thread_proxy.cc
@@ -133,8 +133,8 @@ void MusThreadProxy::CursorSet(gfx::AcceleratedWidget widget,
 
 void MusThreadProxy::Move(gfx::AcceleratedWidget widget,
                           const gfx::Point& location) {
+  // NOTE: Input events skip the main thread to avoid jank.
   DCHECK(drm_thread_->IsRunning());
-  DCHECK(on_window_server_thread_.CalledOnValidThread());
   drm_thread_->task_runner()->PostTask(
       FROM_HERE, base::Bind(&DrmThread::MoveCursor,
                             base::Unretained(drm_thread_), widget, location));