X11: Add TestDesktopScreenX11 to simulate mouse movement in ui tests

ui/views/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 config("flags") {
   defines = [ "TOOLKIT_VIEWS=1" ]
@@ skipping 732 matching lines @@
     ]
     deps += [
       "//ui/aura",
       "//ui/aura:test_support",
       "//ui/wm",
     ]
     if (use_x11 && !is_chromeos) {
       sources += [
         "test/desktop_screen_x11_test_api.cc",
         "test/desktop_screen_x11_test_api.h",
+        "test/test_desktop_screen_x11.cc",
+        "test/test_desktop_screen_x11.h",
         "test/ui_controls_factory_desktop_aurax11.cc",
         "test/ui_controls_factory_desktop_aurax11.h",
       ]
     }
   }
   if (use_x11) {
     deps += [ "//ui/gfx/x" ]
   }
   if (use_ozone || !use_x11) {
     sources -= [
@@ skipping 236 matching lines @@
       "//ui/base:test_support",
       "//ui/compositor",
       "//ui/events:test_support",
       "//ui/gl:test_support",
       "//ui/resources",
       "//ui/resources:ui_test_pak",
       "//ui/strings",
     ]
   }
 }