cros: Force disable stylus features on pyro.

ash/common/system/chromeos/palette/palette_tray.cc

Index: ash/common/system/chromeos/palette/palette_tray.cc
diff --git a/ash/common/system/chromeos/palette/palette_tray.cc b/ash/common/system/chromeos/palette/palette_tray.cc
index 274ec6698a9eab84726dce0ee5bf6b90e3c7ff58..78146b08305b9128b7de261e64e48347d936f234 100644
--- a/ash/common/system/chromeos/palette/palette_tray.cc
+++ b/ash/common/system/chromeos/palette/palette_tray.cc
@@ -301,6 +301,10 @@ void PaletteTray::OnTouchscreenDeviceConfigurationChanged() {
 }
 
 void PaletteTray::OnStylusStateChanged(ui::StylusState stylus_state) {
+  // Device may have a stylus but it has been forcibly disabled.
+  if (!palette_utils::HasStylusInput())
+    return;
+
   PaletteDelegate* palette_delegate = WmShell::Get()->palette_delegate();
 
   // Don't do anything if the palette should not be shown or if the user has