Fix stylus tools palette.

ash/system/status_area_widget.cc

Index: ash/system/status_area_widget.cc
diff --git a/ash/system/status_area_widget.cc b/ash/system/status_area_widget.cc
index b78677fe62edfb98e89ca8e8be5a97e64cb97f41..f8dfb81b2641b04c3260c4425043eeb8cde8d870 100644
--- a/ash/system/status_area_widget.cc
+++ b/ash/system/status_area_widget.cc
@@ -215,7 +215,9 @@ void StatusAreaWidget::AddPaletteTray() {
   // Create the palette only on the internal display, where the stylus is
   // available. We also create a palette on every display if requested from the
   // command line.
-  if (display.IsInternal() || palette_utils::IsPaletteEnabledOnEveryDisplay()) {
+  if (palette_utils::HasStylusInput() &&
+      (display.IsInternal() ||
+       palette_utils::IsPaletteEnabledOnEveryDisplay())) {
     palette_tray_ = new PaletteTray(wm_shelf_);
     status_area_widget_delegate_->AddTray(palette_tray_);
   }