Implement a MoveCursorToScreenLocation for just the window manager.

ui/aura/mus/window_tree_host_mus.cc

Index: ui/aura/mus/window_tree_host_mus.cc
diff --git a/ui/aura/mus/window_tree_host_mus.cc b/ui/aura/mus/window_tree_host_mus.cc
index 85cdf6a4dbffecb270771c8ea66f2d378295362c..5e60905d5d1ed4472219b716b4076597c99e40cd 100644
--- a/ui/aura/mus/window_tree_host_mus.cc
+++ b/ui/aura/mus/window_tree_host_mus.cc
@@ -200,10 +200,12 @@ gfx::ICCProfile WindowTreeHostMus::GetICCProfileForCurrentDisplay() {
 
 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);
 }