[Chrome OS MD] Implement accessibility detailed view for the MD Ash system menu

ash/common/system/tray_accessibility.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_ACCESSIBILITY_H_
 #define ASH_COMMON_SYSTEM_TRAY_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include "ash/common/accessibility_delegate.h"
@@ skipping 48 matching lines @@
   void HandleViewClicked(views::View* view) override;
   void HandleButtonPressed(views::Button* sender,
                            const ui::Event& event) override;
 
   // Add the accessibility feature list.
   void AppendAccessibilityList();
 
   // Add help entries.
   void AppendHelpEntries();
 
+  // Helper functions to create entries in the detailed accessibility view.
   HoverHighlightView* AddScrollListItem(const base::string16& text,
                                         bool highlight,
                                         bool checked);
+  HoverHighlightView* AddScrollListItemMD(const base::string16& text,
+                                          bool highlight,
+                                          bool checked,
+                                          const gfx::ImageSkia& image);
 
   views::View* spoken_feedback_view_;
   views::View* high_contrast_view_;
   views::View* screen_magnifier_view_;
   views::View* large_cursor_view_;
   views::View* help_view_;
   views::View* settings_view_;
   views::View* autoclick_view_;
   views::View* virtual_keyboard_view_;
 
@@ skipping 49 matching lines @@
   // A11y feature status on just entering the lock screen.
   bool show_a11y_menu_on_lock_screen_;
 
   friend class chromeos::TrayAccessibilityTest;
   DISALLOW_COPY_AND_ASSIGN(TrayAccessibility);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_ACCESSIBILITY_H_