cros: Use runtime stylus detection for ash palette.

ash/laser/laser_pointer_controller.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/laser/laser_pointer_controller.h"
 
 #include "ash/common/system/chromeos/palette/palette_utils.h"
 #include "ash/laser/laser_pointer_view.h"
 #include "ash/shell.h"
 #include "ui/display/screen.h"
@@ skipping 52 matching lines @@
   // Find the root window that the event was captured on. We never need to
   // switch between different root windows because it is not physically possible
   // to seamlessly drag a finger between two displays like it is with a mouse.
   gfx::Point event_location = event->root_location();
   aura::Window* current_window =
       static_cast<aura::Window*>(event->target())->GetRootWindow();
 
   // Start a new laser session if the stylus is pressed but not pressed over the
   // palette.
   if (event->type() == ui::ET_TOUCH_PRESSED &&
-      !PaletteContainsPointInScreen(event_location)) {
+      !palette_utils::PaletteContainsPointInScreen(event_location)) {
     DestroyLaserPointerView();
     UpdateLaserPointerView(current_window, event_location, event);
   }
 
   // Do not update laser if it is in the process of fading away.
   if (event->type() == ui::ET_TOUCH_MOVED && laser_pointer_view_ &&
       !is_fading_away_) {
     UpdateLaserPointerView(current_window, event_location, event);
     RestartTimer();
   }
@@ skipping 60 matching lines @@
       kPointLifeDurationMs) {
     stationary_timer_->Stop();
     // Reset the view if the timer expires and the view was in process of fading
     // away.
     if (is_fading_away_)
       DestroyLaserPointerView();
   }
   stationary_timer_repeat_count_++;
 }
 }  // namespace ash