mus: Implement ScreenMus::GetCursorScreenPoint().

components/mus/ws/user_display_manager.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 "components/mus/ws/user_display_manager.h"
 
 #include "components/mus/ws/display.h"
 #include "components/mus/ws/display_manager.h"
 #include "components/mus/ws/window_manager_state.h"
+#include "mojo/converters/geometry/geometry_type_converters.h"
 
 namespace mus {
 namespace ws {
 
 UserDisplayManager::UserDisplayManager(ws::DisplayManager* display_manager,
                                        const UserId& user_id)
     : display_manager_(display_manager), user_id_(user_id) {
   for (const WindowManagerState* wms : GetWindowManagerStatesForUser()) {
     if (wms->got_frame_decoration_values()) {
       got_valid_frame_decorations_ = true;
@@ skipping 35 matching lines @@
   }
 
   display_manager_observers_.ForAllPtrs(
       [this, &display](mojom::DisplayManagerObserver* observer) {
         observer->OnDisplayRemoved(display->id());
       });
   if (test_observer_)
     test_observer_->OnDisplayRemoved(display->id());
 }
 
+void UserDisplayManager::OnMouseCursorLocationChanged(
+    const gfx::Point& location) {
+  mouse_location_ = location;
+}
+
 std::set<const WindowManagerState*>
 UserDisplayManager::GetWindowManagerStatesForUser() const {
   std::set<const WindowManagerState*> result;
   for (const Display* display : display_manager_->displays()) {
     const WindowManagerState* wms =
         display->GetWindowManagerStateForUser(user_id_);
     if (wms && wms->got_frame_decoration_values())
       result.insert(wms);
   }
   return result;
@@ skipping 38 matching lines @@
     test_observer_->OnDisplaysChanged(displays.Clone());
 }
 
 void UserDisplayManager::AddObserver(
     mojom::DisplayManagerObserverPtr observer) {
   mojom::DisplayManagerObserver* observer_impl = observer.get();
   display_manager_observers_.AddPtr(std::move(observer));
   OnObserverAdded(observer_impl);
 }
 
+void UserDisplayManager::GetCursorScreenPoint(
+    const GetCursorScreenPointCallback& callback) {
+  callback.Run(mojo::Point::From(mouse_location_));
+}
+
 }  // namespace ws
 }  // namespace mus