A11y: Introduce High Contrast Mode and Screen Magnifier to ubar 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 <vector>
 
 #include "ash/ash_export.h"
+#include "ash/magnifier/magnifier_constants.h"
 #include "ash/shell.h"
 #include "base/callback.h"
 #include "base/string16.h"
 #include "base/time.h"
 
 namespace app_list {
 class AppListViewDelegate;
 }
 
 namespace aura {
@@ skipping 101 matching lines @@
 
   // Shows the keyboard shortcut overlay.
   virtual void ShowKeyboardOverlay() = 0;
 
   // Shows the task manager window.
   virtual void ShowTaskManager() = 0;
 
   // Get the current browser context. This will get us the current profile.
   virtual content::BrowserContext* GetCurrentBrowserContext() = 0;
 
-  // Invoked when the user presses a shortcut to toggle spoken feedback
-  // for accessibility.
+  // Invoked to toggle spoken feedback for accessibility
   virtual void ToggleSpokenFeedback() = 0;
 
   // Returns true if spoken feedback is enabled.
   virtual bool IsSpokenFeedbackEnabled() const = 0;
 
+  // Invoked to toggle high contrast for accessibility.
+  virtual void ToggleHighContrast() = 0;
+
+  // Returns true if high contrast mode is enabled.
+  virtual bool IsHighContrastEnabled() const = 0;
+
+  // Invoked to change the mode of the screen magnifier.
+  virtual void SetMagnifier(MagnifierType type) = 0;
+
+  // Returns the current screen magnifier mode.
+  virtual MagnifierType GetMagnifierType() 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;
+
   // Invoked to create an AppListViewDelegate. Shell takes the ownership of
   // the created delegate.
   virtual app_list::AppListViewDelegate* CreateAppListViewDelegate() = 0;
 
   // Creates a new LauncherDelegate. Shell takes ownership of the returned
   // value.
   virtual LauncherDelegate* CreateLauncherDelegate(
       ash::LauncherModel* model) = 0;
 
   // Creates a system-tray delegate. Shell takes ownership of the delegate.
@@ skipping 45 matching lines @@
   virtual aura::client::StackingClient* CreateStackingClient() = 0;
 
   // True if the user's preferences have the Search key acting as a Function key
   // modifier for accessing extended keyboard shortcuts.
   virtual bool IsSearchKeyActingAsFunctionKey() const = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_