Implement a MoveCursorToScreenLocation for just the window manager.

ui/aura/mus/window_tree_host_mus.cc

 // Copyright 2015 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/aura/mus/window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "ui/aura/env.h"
 #include "ui/aura/mus/input_method_mus.h"
 #include "ui/aura/mus/window_port_mus.h"
@@ skipping 182 matching lines @@
   OnHostCloseRequested();
 }
 
 gfx::ICCProfile WindowTreeHostMus::GetICCProfileForCurrentDisplay() {
   // TODO: This should read the profile from mus. crbug.com/647510
   return gfx::ICCProfile();
 }
 
 void WindowTreeHostMus::MoveCursorToScreenLocationInPixels(
     const gfx::Point& location_in_pixels) {
-  // TODO: this needs to message the server http://crbug.com/693340. Setting
-  // the location is really only appropriate in tests, outside of tests this
-  // value is ignored.
-  NOTIMPLEMENTED();
+  gfx::Point screen_location_in_pixels = location_in_pixels;
+  gfx::Point location = GetLocationOnScreenInPixels();

[sky, 2017/06/01 22:13:20]

I'm confused, all the calculations here are in pixels, yet the rest of the
functions say dips? It seems to me that if you are specifying a location
relative to a display, it can (and should be) in pixels, otherwise you can't
position at pixel locations.

[Elliot Glaysher, 2017/06/01 23:05:42]

This was me not changing variable names after Ria's comments above. I've gone
through and changed the variable names across the patch.

+  screen_location_in_pixels.Offset(-location.x(), -location.y());
+  delegate_->OnWindowTreeHostMoveCursorToDisplayLocation(
+      screen_location_in_pixels, display_id_);
+
   Env::GetInstance()->set_last_mouse_location(location_in_pixels);
 }
 
 }  // namespace aura