exo: Implement support for zcr_keyboard_configuration_v1 protocol.

components/exo/wm_helper_mus.cc

Index: components/exo/wm_helper_mus.cc
diff --git a/components/exo/wm_helper_mus.cc b/components/exo/wm_helper_mus.cc
index 9a67809eae22de12493c3664151aac2917f93565..4a2d37253fee7370a21eab5415b76b355c8a47d8 100644
--- a/components/exo/wm_helper_mus.cc
+++ b/components/exo/wm_helper_mus.cc
@@ -148,4 +148,8 @@ void WMHelperMus::OnWindowFocused(aura::Window* gained_focus,
   }
 }
 
+void WMHelperMus::OnKeyboardDeviceConfigurationChanged() {
+  NotifyKeyboardDeviceConfigurationChanged();
+}
+
 }  // namespace exo