Implement the palette help and options buttons.

ash/common/system/tray/system_tray_delegate.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_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 171 matching lines @@
 
   // Shows help.
   virtual void ShowHelp();
 
   // Show accessilibity help.
   virtual void ShowAccessibilityHelp();
 
   // Show the settings related to accessilibity.
   virtual void ShowAccessibilitySettings();
 
+  // Shows the help center article for palette.
+  virtual void ShowPaletteHelp();
+
+  // Shows the settings related to the palette.
+  virtual void ShowPaletteSettings();
+
   // Shows more information about public account mode.
   virtual void ShowPublicAccountInfo();
 
   // Shows information about enterprise enrolled devices.
   virtual void ShowEnterpriseInfo();
 
   // Shows information about supervised users.
   virtual void ShowSupervisedUserInfo();
 
   // Shows login UI to add other users to this session.
@@ skipping 121 matching lines @@
   // Creates a system tray item for display rotation lock.
   // TODO(jamescook): Remove this when mus has support for display management
   // and we have a DisplayManager equivalent. See http://crbug.com/548429
   virtual std::unique_ptr<SystemTrayItem> CreateRotationLockTrayItem(
       SystemTray* tray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_