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 e7c66b1d3aec98dd404396bc78d46b00ca581f97..afe1a096f13ce610fe1872a1d12a60cd2dcb3a0c 100644
--- a/ash/common/system/chromeos/palette/palette_tray.cc
+++ b/ash/common/system/chromeos/palette/palette_tray.cc
@@ -289,6 +289,10 @@ 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