X11: Add TestDesktopScreenX11 to simulate mouse movement in ui tests

ui/views/test/ui_controls_factory_desktop_aurax11.cc

Index: ui/views/test/ui_controls_factory_desktop_aurax11.cc
diff --git a/ui/views/test/ui_controls_factory_desktop_aurax11.cc b/ui/views/test/ui_controls_factory_desktop_aurax11.cc
index 2cd37fe81b4e86b92e4b8102d66ea425bc5bceec..2be0e63bc3b3b8e3315f093f67d431e05c3adf63 100644
--- a/ui/views/test/ui_controls_factory_desktop_aurax11.cc
+++ b/ui/views/test/ui_controls_factory_desktop_aurax11.cc
@@ -25,6 +25,7 @@
 #include "ui/events/keycodes/keyboard_code_conversion_x.h"
 #include "ui/events/test/platform_event_waiter.h"
 #include "ui/gfx/x/x11_connection.h"
+#include "ui/views/test/test_desktop_screen_x11.h"
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 namespace views {
@@ -145,6 +146,10 @@ class UIControlsDesktopX11 : public UIControlsAura {
         aura::test::QueryLatestMousePositionRequestInHost(host);
     host->ConvertPointFromHost(&root_current_location);
 
+    auto screen = views::test::TestDesktopScreenX11::GetInstance();
+    DCHECK_EQ(screen, display::Screen::GetScreen());
+    screen->set_cursor_screen_point(gfx::Point(screen_x, screen_y));
+
     if (root_location != root_current_location && button_down_mask == 0) {
       // Move the cursor because EnterNotify/LeaveNotify are generated with the
       // current mouse position as a result of XGrabPointer()