exo: Produce an error if get_keyboard_device_configuration is called with a keyboard object that al…

components/exo/keyboard.cc

Index: components/exo/keyboard.cc
diff --git a/components/exo/keyboard.cc b/components/exo/keyboard.cc
index 206b61f72c5b4c9ac404989b32f272b4e29ec126..b6882f80aa517103df433c6a4d6a66143f3f1cc2 100644
--- a/components/exo/keyboard.cc
+++ b/components/exo/keyboard.cc
@@ -114,6 +114,10 @@ Keyboard::~Keyboard() {
   helper->RemoveInputDeviceEventObserver(this);
 }
 
+bool Keyboard::HasDeviceConfigurationDelegate() const {
+  return !!device_configuration_delegate_;
+}
+
 void Keyboard::SetDeviceConfigurationDelegate(
     KeyboardDeviceConfigurationDelegate* delegate) {
   device_configuration_delegate_ = delegate;