[MD] Implement incognito colors as a NativeTheme (for Aura).

chrome/browser/ui/views/frame/browser_frame.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_VIEWS_FRAME_BROWSER_FRAME_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_H_
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 84 matching lines @@
   // Retrieves the window placement (show state and bounds) for restoring.
   void GetWindowPlacement(gfx::Rect* bounds,
                           ui::WindowShowState* show_state) const;
 
   // Overridden from views::Widget:
   views::internal::RootView* CreateRootView() override;
   views::NonClientFrameView* CreateNonClientFrameView() override;
   bool GetAccelerator(int command_id,
                       ui::Accelerator* accelerator) const override;
   ui::ThemeProvider* GetThemeProvider() const override;
+  const ui::NativeTheme* GetNativeTheme() const override;
   void SchedulePaintInRect(const gfx::Rect& rect) override;
   void OnNativeWidgetActivationChanged(bool active) override;
 
   // Overridden from views::ContextMenuController:
   void ShowContextMenuForView(views::View* source,
                               const gfx::Point& p,
                               ui::MenuSourceType source_type) override;
 
   AvatarMenuButton* GetAvatarMenuButton();
 
@@ skipping 31 matching lines @@
   // externally).
   scoped_ptr<ui::ThemeProvider> owned_theme_provider_;
   ui::ThemeProvider* theme_provider_;
 
   scoped_ptr<ui::EventHandler> browser_command_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserFrame);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_H_