aura: Scale custom cursors appropriately.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index e0e3c52ffd6abf3a5120f14f4b4c6dd605dff45a..2adb685b1f949d2db98c3437ca525c7c8f639593 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -344,6 +344,8 @@ gfx::Rect RenderWidgetHostViewAura::GetViewBounds() const {
 
 void RenderWidgetHostViewAura::UpdateCursor(const WebCursor& cursor) {
   current_cursor_ = cursor;
+  const gfx::Display display = gfx::Screen::GetDisplayNearestWindow(window_);
+  current_cursor_.SetScaleFactor(display.device_scale_factor());
   UpdateCursorIfOverSelf();
 }
 
@@ -1175,6 +1177,7 @@ void RenderWidgetHostViewAura::OnDeviceScaleFactorChanged(
     backing_store->ScaleFactorChanged(device_scale_factor);
 
   host_->SetDeviceScaleFactor(device_scale_factor);
+  current_cursor_.SetScaleFactor(device_scale_factor);
 }
 
 void RenderWidgetHostViewAura::OnWindowDestroying() {