ash/chromeos: Add shift-alt-p shortcut to open palette.

ash/common/system/status_area_widget.h

 // Copyright (c) 2012 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.
 
 #ifndef ASH_COMMON_SYSTEM_STATUS_AREA_WIDGET_H_
 #define ASH_COMMON_SYSTEM_STATUS_AREA_WIDGET_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/login_status.h"
 #include "ash/common/shelf/shelf_background_animator_observer.h"
@@ skipping 47 matching lines @@
   StatusAreaWidgetDelegate* status_area_widget_delegate() {
     return status_area_widget_delegate_;
   }
   SystemTray* system_tray() { return system_tray_; }
   WebNotificationTray* web_notification_tray() {
     return web_notification_tray_;
   }
   OverviewButtonTray* overview_button_tray() { return overview_button_tray_; }
 
 #if defined(OS_CHROMEOS)
+  PaletteTray* palette_tray() { return palette_tray_; }
+
   ImeMenuTray* ime_menu_tray_for_testing() { return ime_menu_tray_; }
 #endif
 
   WmShelf* wm_shelf() { return wm_shelf_; }
 
   LoginStatus login_status() const { return login_status_; }
 
   // Returns true if the shelf should be visible. This is used when the
   // shelf is configured to auto-hide and test if the shelf should force
   // the shelf to remain visible.
@@ skipping 42 matching lines @@
   LoginStatus login_status_;
 
   WmShelf* wm_shelf_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaWidget);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_STATUS_AREA_WIDGET_H_