Large Cursor: Add the toggle menuitem to a11y menu in uber tray

ash/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 ASH_SHELL_DELEGATE_H_
 #define ASH_SHELL_DELEGATE_H_
 
 #include <string>
 
 #include "ash/ash_export.h"
@@ skipping 164 matching lines @@
 
   // Invoked to change the type of the screen magnifier.
   virtual void SetMagnifierType(MagnifierType type) = 0;
 
   // Returns if the screen magnifier is enabled or not.
   virtual bool IsMagnifierEnabled() const = 0;
 
   // Returns the current screen magnifier mode.
   virtual MagnifierType GetMagnifierType() const = 0;
 
+  // Invoked to enable Large Cursor.
+  virtual void SetLargeCursorEnabled(bool enabled) = 0;
+
+  // Returns if Large Cursor is enabled or not.
+  virtual bool IsLargeCursorEnabled() const = 0;
+
   // Returns true if the user want to show accesibility menu even when all the
   // accessibility features are disabled.
   virtual bool ShouldAlwaysShowAccessibilityMenu() const = 0;
 
   // Cancel all current and queued speech immediately.
   virtual void SilenceSpokenFeedback() const = 0;
 
   // Invoked to create an AppListViewDelegate. Shell takes the ownership of
   // the created delegate.
   virtual app_list::AppListViewDelegate* CreateAppListViewDelegate() = 0;
@@ skipping 55 matching lines @@
   // value.
   virtual RootWindowHostFactory* CreateRootWindowHostFactory() = 0;
 
   // Get the product name.
   virtual base::string16 GetProductName() const = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_