Notification for device scale factor change

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index b63e8fdd0ad249b1f98e407f47ee649dcb7cc86d..a71b3d7b1335aa492952e285fbf9489da33dbf8a 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -784,6 +784,10 @@ void NativeWidgetAura::OnPaint(gfx::Canvas* canvas) {
   delegate_->OnNativeWidgetPaint(canvas);
 }
 
+void NativeWidgetAura::OnDeviceScaleFactorChanged(float device_scale_factor) {
+  // Repainting with new scale factor will paint the content at the right scale.
+}
+
 void NativeWidgetAura::OnWindowDestroying() {
   delegate_->OnNativeWidgetDestroying();