Add unittests for X11TopmostWindowFinder

ui/views/views.gyp

Index: ui/views/views.gyp
diff --git a/ui/views/views.gyp b/ui/views/views.gyp
index 7cced906b4cad65b4a54eae89a237ab53767111f..afa1ff774c9845d6c9f1482afea0e1270bdc0e67 100644
--- a/ui/views/views.gyp
+++ b/ui/views/views.gyp
@@ -579,6 +579,8 @@
         'test/views_test_helper_aura.h',
         'test/widget_test.cc',
         'test/widget_test.h',
+        'test/x11_property_change_waiter.cc',
+        'test/x11_property_change_waiter.h',
       ],
       'conditions': [
         ['chromeos==1', {
@@ -680,6 +682,7 @@
         'widget/desktop_aura/desktop_screen_x11_unittest.cc',
         'widget/desktop_aura/desktop_screen_position_client_unittest.cc',
         'widget/desktop_aura/desktop_window_tree_host_x11_unittest.cc',
+        'widget/desktop_aura/x11_topmost_window_finder_unittest.cc',
         'widget/native_widget_aura_unittest.cc',
         'widget/native_widget_unittest.cc',
         'widget/root_view_unittest.cc',
@@ -735,7 +738,8 @@
         ['use_x11==1', {
           'dependencies': [
             '../../build/linux/system.gyp:x11',
-            '../../build/linux/system.gyp:xext',
+            '../../build/linux/system.gyp:xext', 
+            '../events/platform/x11/x11_events_platform.gyp:x11_events_platform',
           ],
         }],
         ['use_ozone==1', {
@@ -748,11 +752,6 @@
             '../aura/aura.gyp:aura_test_support',
           ],
         }],
-        ['use_x11==1', {
-          'dependencies': [
-            '../events/platform/x11/x11_events_platform.gyp:x11_events_platform',
-          ],
-        }],
       ],
     },  # target_name: views_unittests
   ],