Wire up cursor proxy on MUS

ui/ozone/platform/drm/mus_thread_proxy.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/mus_thread_proxy.h"
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
 #include "base/task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 115 matching lines @@
   DCHECK(drm_thread_->IsRunning());
   DCHECK(on_window_server_thread_.CalledOnValidThread());
   drm_thread_->task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&DrmThread::SetCursor, base::Unretained(drm_thread_), widget,
                  bitmaps, location, frame_delay_ms));
 }
 
 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));
 }
 
 // Services needed for DrmOverlayManager.
 void MusThreadProxy::RegisterHandlerForDrmOverlayManager(
     DrmOverlayManager* handler) {
   DCHECK(on_window_server_thread_.CalledOnValidThread());
   overlay_manager_ = handler;
@@ skipping 182 matching lines @@
   display_manager_->GpuReceivedHDCPState(display_id, success, state);
 }
 
 void MusThreadProxy::GpuSetHDCPStateCallback(int64_t display_id,
                                              bool success) const {
   DCHECK(on_window_server_thread_.CalledOnValidThread());
   display_manager_->GpuUpdatedHDCPState(display_id, success);
 }
 
 }  // namespace ui