[Touch emulator] Update cursor when device scale factor changes.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index c088b30459bec86e23e54cdb35844e697c1c7922..6141da6dc17a327adfaad69e89de263e97aec73e 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1420,6 +1420,11 @@ void RenderWidgetHostImpl::NotifyScreenInfoChanged() {
   // the screen info as well as the new size (if the screen has changed scale
   // factor).
   WasResized();
+
+  if (touch_emulator_) {
+    touch_emulator_->SetDeviceScaleFactor(
+        view_.get() ? content::GetScaleFactorForView(view_.get()) : 1.0f);
+  }
 }
 
 void RenderWidgetHostImpl::GetSnapshotFromBrowser(