Add MetalayerMode to the palette.

ash/shell/shell_delegate_impl.cc

 // 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.
 
 #include "ash/shell/shell_delegate_impl.h"
 
 #include "ash/accessibility_delegate.h"
 #include "ash/default_accessibility_delegate.h"
 #include "ash/default_wallpaper_delegate.h"
 #include "ash/gpu_support_stub.h"
@@ skipping 34 matching lines @@
   void CreateNote() override {}
   bool HasNoteApp() override { return false; }
   bool ShouldAutoOpenPalette() override { return false; }
   bool ShouldShowPalette() override { return false; }
   void TakeScreenshot() override {}
   void TakePartialScreenshot(const base::Closure& done) override {
     if (done)
       done.Run();
   }
   void CancelPartialScreenshot() override {}
+  bool IsMetalayerSupported() override { return false; }
+  void ShowMetalayer(const base::Closure& closed) override {}
+  void HideMetalayer() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PaletteDelegateImpl);
 };
 
 class SessionStateDelegateImpl : public SessionStateDelegate {
  public:
   SessionStateDelegateImpl() : user_info_(new user_manager::UserInfoImpl()) {}
 
   ~SessionStateDelegateImpl() override {}
@@ skipping 105 matching lines @@
   return true;
 }
 
 void ShellDelegateImpl::SetTouchscreenEnabledInPrefs(bool enabled,
                                                      bool use_local_state) {}
 
 void ShellDelegateImpl::UpdateTouchscreenStatusFromPrefs() {}
 
 }  // namespace shell
 }  // namespace ash