cros: Force disable stylus features on pyro.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/chromeos/palette/palette_tray.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 271 matching lines @@
 void PaletteTray::HideBubbleWithView(const views::TrayBubbleView* bubble_view) {
   if (bubble_->bubble_view() == bubble_view)
     HidePalette();
 }
 
 void PaletteTray::OnTouchscreenDeviceConfigurationChanged() {
   UpdateIconVisibility();
 }
 
 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
   // disabled it all-together.
   if (!IsInUserSession() || !palette_delegate->ShouldShowPalette())
     return;
 
   // Auto show/hide the palette if allowed by the user.
   if (palette_delegate->ShouldAutoOpenPalette()) {
     if (stylus_state == ui::StylusState::REMOVED && !bubble_) {
@@ skipping 128 matching lines @@
     UpdateIconVisibility();
   }
 }
 
 void PaletteTray::UpdateIconVisibility() {
   SetVisible(is_palette_enabled_ && palette_utils::HasStylusInput() &&
              IsInUserSession());
 }
 
 }  // namespace ash