Add MetalayerMode to the palette.

chrome/browser/ui/ash/palette_delegate_chromeos.h

 // Copyright 2015 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 CHROME_BROWSER_UI_ASH_PALETTE_DELEGATE_CHROMEOS_H_
 #define CHROME_BROWSER_UI_ASH_PALETTE_DELEGATE_CHROMEOS_H_
 
 #include <string>
 
 #include "ash/palette_delegate.h"
@@ skipping 27 matching lines @@
   // ash::PaletteDelegate:
   std::unique_ptr<EnableListenerSubscription> AddPaletteEnableListener(
       const EnableListener& on_state_changed) override;
   void CreateNote() override;
   bool HasNoteApp() override;
   bool ShouldAutoOpenPalette() override;
   bool ShouldShowPalette() override;
   void TakeScreenshot() override;
   void TakePartialScreenshot(const base::Closure& done) override;
   void CancelPartialScreenshot() override;
+  bool IsMetalayerSupported() override;
+  void ShowMetalayer(const base::Closure& closed) override;
+  void HideMetalayer() override;
 
   // user_manager::UserManager::UserSessionStateObserver:
   void ActiveUserChanged(const user_manager::User* active_user) override;
 
   // content::NotificationObserver:
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   // Called when the palette enabled pref has changed.
@@ skipping 15 matching lines @@
       voice_interaction_screenshot_delegate_;
 
   base::WeakPtrFactory<PaletteDelegateChromeOS> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PaletteDelegateChromeOS);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_ASH_PALETTE_DELEGATE_CHROMEOS_H_