Add generic PaletteDelegate code.

chrome/browser/ui/ash/chrome_shell_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 CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_
 #define CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 33 matching lines @@
   keyboard::KeyboardUI* CreateKeyboardUI() override;
   void OpenUrlFromArc(const GURL& url) override;
   app_list::AppListPresenter* GetAppListPresenter() override;
   ash::ShelfDelegate* CreateShelfDelegate(ash::ShelfModel* model) override;
   ash::SystemTrayDelegate* CreateSystemTrayDelegate() override;
   ash::UserWallpaperDelegate* CreateUserWallpaperDelegate() override;
   ash::SessionStateDelegate* CreateSessionStateDelegate() override;
   ash::AccessibilityDelegate* CreateAccessibilityDelegate() override;
   ash::NewWindowDelegate* CreateNewWindowDelegate() override;
   ash::MediaDelegate* CreateMediaDelegate() override;
+  std::unique_ptr<ash::PaletteDelegate> CreatePaletteDelegate() override;
   std::unique_ptr<ash::PointerWatcherDelegate> CreatePointerWatcherDelegate()
       override;
   ui::MenuModel* CreateContextMenu(ash::WmShelf* wm_shelf,
                                    const ash::ShelfItem* item) override;
   ash::GPUSupport* CreateGPUSupport() override;
   base::string16 GetProductName() const override;
   void OpenKeyboardShortcutHelpPage() const override;
   gfx::Image GetDeprecatedAcceleratorImage() const override;
   void ToggleTouchpad() override;
   void ToggleTouchscreen() override;
@@ skipping 13 matching lines @@
   // Proxies events from chrome/browser to ash::UserMetricsRecorder.
   std::unique_ptr<ChromeUserMetricsRecorder> chrome_user_metrics_recorder_;
 
   std::unique_ptr<chromeos::DisplayConfigurationObserver>
       display_configuration_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeShellDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_