mus: Implement ScreenMus::GetCursorScreenPoint().

ui/views/mus/screen_mus.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/views/mus/screen_mus.h"
 
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "services/shell/public/cpp/connection.h"
 #include "services/shell/public/cpp/connector.h"
 #include "ui/gfx/display_finder.h"
@@ skipping 125 matching lines @@
       changed_display.device_scale_factor()) {
     local_display->set_device_scale_factor(
         changed_display.device_scale_factor());
     changed_values |= gfx::DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
   }
   FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_,
                     OnDisplayMetricsChanged(*local_display, changed_values));
 }
 
 gfx::Point ScreenMus::GetCursorScreenPoint() {
-  NOTIMPLEMENTED();
-  return gfx::Point();
+  return delegate_->GetCursorScreenPoint();
 }
 
 gfx::NativeWindow ScreenMus::GetWindowUnderCursor() {
   NOTIMPLEMENTED();
   return nullptr;
 }
 
 gfx::NativeWindow ScreenMus::GetWindowAtScreenPoint(const gfx::Point& point) {
   NOTIMPLEMENTED();
   return nullptr;
@@ skipping 70 matching lines @@
   DCHECK_NE(-1, index);
   // Another display must become primary before the existing primary is
   // removed.
   DCHECK_NE(index, primary_display_index_);
   const gfx::Display display = displays_[index];
   FOR_EACH_OBSERVER(gfx::DisplayObserver, observers_,
                     OnDisplayRemoved(display));
 }
 
 }  // namespace views