aura: Make keyevents for renderers work correctly in X11.

views/widget/native_widget_aura.cc

Index: views/widget/native_widget_aura.cc
diff --git a/views/widget/native_widget_aura.cc b/views/widget/native_widget_aura.cc
index 19df7583113621680da769ad63970fce522f80e8..ac3d7812ccd463756b094122d97fb381ffc57b9f 100644
--- a/views/widget/native_widget_aura.cc
+++ b/views/widget/native_widget_aura.cc
@@ -534,13 +534,13 @@ bool NativeWidgetAura::ShouldActivate(aura::Event* event) {
 
 void NativeWidgetAura::OnActivated() {
   delegate_->OnNativeWidgetActivationChanged(true);
-  if (IsVisible())
+  if (IsVisible() && GetWidget()->non_client_view())
     GetWidget()->non_client_view()->SchedulePaint();
 }
 
 void NativeWidgetAura::OnLostActive() {
   delegate_->OnNativeWidgetActivationChanged(false);
-  if (IsVisible())
+  if (IsVisible() && GetWidget()->non_client_view())
     GetWidget()->non_client_view()->SchedulePaint();
 }