Add native X11 testing to chromeos::EventRewriter unit tests

ui/events/test/events_test_utils_x11.cc

Index: ui/events/test/events_test_utils_x11.cc
diff --git a/ui/events/test/events_test_utils_x11.cc b/ui/events/test/events_test_utils_x11.cc
index 48f6ecc7cf51fc05adf3130a671bda65f117216c..67b16818cbb489031c67e045544aaa67c25fb099 100644
--- a/ui/events/test/events_test_utils_x11.cc
+++ b/ui/events/test/events_test_utils_x11.cc
@@ -23,6 +23,10 @@ unsigned int XEventState(int flags) {
       ((flags & ui::EF_CONTROL_DOWN) ? ControlMask : 0) |
       ((flags & ui::EF_ALT_DOWN) ? Mod1Mask : 0) |
       ((flags & ui::EF_CAPS_LOCK_DOWN) ? LockMask : 0) |
+      ((flags & ui::EF_ALTGR_DOWN) ? Mod5Mask : 0) |
+      ((flags & ui::EF_COMMAND_DOWN) ? Mod4Mask : 0) |
+      ((flags & ui::EF_MOD3_DOWN) ? Mod3Mask : 0) |
+      ((flags & ui::EF_NUMPAD_KEY) ? Mod2Mask : 0) |
       ((flags & ui::EF_LEFT_MOUSE_BUTTON) ? Button1Mask: 0) |
       ((flags & ui::EF_MIDDLE_MOUSE_BUTTON) ? Button2Mask: 0) |
       ((flags & ui::EF_RIGHT_MOUSE_BUTTON) ? Button3Mask: 0);