A11y: Introduce High Contrast Mode and Screen Magnifier to ubar tray.

ash/shell/shell_delegate_impl.h

Index: ash/shell/shell_delegate_impl.h
diff --git a/ash/shell/shell_delegate_impl.h b/ash/shell/shell_delegate_impl.h
index 9e34aff893318d4206aab89addee2585b2012a08..e70ee629e5cfc336b95a56b038d66a6011cf2e27 100644
--- a/ash/shell/shell_delegate_impl.h
+++ b/ash/shell/shell_delegate_impl.h
@@ -43,6 +43,11 @@ class ShellDelegateImpl : public ash::ShellDelegate {
   virtual content::BrowserContext* GetCurrentBrowserContext() OVERRIDE;
   virtual void ToggleSpokenFeedback() OVERRIDE;
   virtual bool IsSpokenFeedbackEnabled() const OVERRIDE;
+  virtual void ToggleHighContrast() OVERRIDE;
+  virtual bool IsHighContrastEnabled() const OVERRIDE;
+  virtual void SetScreenMagnifier(MagnifierType type) OVERRIDE;
+  virtual MagnifierType GetMagnifierType() const OVERRIDE;
+  virtual bool ShouldAlwaysShowAccessibilityMenu() const OVERRIDE;
   virtual app_list::AppListViewDelegate* CreateAppListViewDelegate() OVERRIDE;
   virtual ash::LauncherDelegate* CreateLauncherDelegate(
       ash::LauncherModel* model) OVERRIDE;
@@ -70,6 +75,8 @@ class ShellDelegateImpl : public ash::ShellDelegate {
 
   bool locked_;
   bool spoken_feedback_enabled_;
+  bool high_contrast_enabled_;
+  MagnifierType screen_magnifier_type_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDelegateImpl);
 };