mus: Implement ScreenMus::GetCursorScreenPoint().

components/mus/ws/window_tree.cc

 // Copyright 2014 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/window_tree.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "components/mus/ws/default_access_policy.h"
 #include "components/mus/ws/display.h"
 #include "components/mus/ws/display_manager.h"
 #include "components/mus/ws/focus_controller.h"
 #include "components/mus/ws/operation.h"
 #include "components/mus/ws/platform_display.h"
 #include "components/mus/ws/server_window.h"
 #include "components/mus/ws/server_window_observer.h"
+#include "components/mus/ws/user_display_manager.h"
 #include "components/mus/ws/window_manager_state.h"
 #include "components/mus/ws/window_server.h"
 #include "components/mus/ws/window_tree_binding.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/converters/ime/ime_type_converters.h"
 #include "mojo/converters/input_events/input_events_type_converters.h"
 #include "mojo/converters/surfaces/surfaces_type_converters.h"
 #include "ui/platform_window/text_input_state.h"
 
 using mojo::Array;
@@ skipping 631 matching lines @@
   DCHECK(window_manager_internal_);
 
   WindowManagerState* wms = display_manager()
                                 ->GetWindowManagerAndDisplay(*roots_.begin())
                                 .window_manager_state;
   CHECK(wms);
   DCHECK_EQ(this, wms->tree());
   return wms;
 }
 
+void WindowTree::GetCursorScreenPoint(
+    const GetCursorScreenPointCallback& callback) {
+  callback.Run(mojo::Point::From(
+      display_manager()->GetUserDisplayManager(user_id_)->cursor_location()));
+}
+
 bool WindowTree::ShouldRouteToWindowManager(const ServerWindow* window) const {
   // If the client created this window, then do not route it through the WM.
   if (window->id().connection_id == id_)
     return false;
 
   // If the client did not create the window, then it must be the root of the
   // client. If not, that means the client should not know about this window,
   // and so do not route the request to the WM.
   if (roots_.count(window) == 0)
     return false;
@@ skipping 726 matching lines @@
 }
 
 bool WindowTree::IsWindowRootOfAnotherTreeForAccessPolicy(
     const ServerWindow* window) const {
   WindowTree* tree = window_server_->GetTreeWithRoot(window);
   return tree && tree != this;
 }
 
 }  // namespace ws
 }  // namespace mus