Add 5 experimental accessibility features on Chrome OS.

ash/default_accessibility_delegate.h

Index: ash/default_accessibility_delegate.h
diff --git a/ash/default_accessibility_delegate.h b/ash/default_accessibility_delegate.h
index e973f56d056c04b771e7f42655ec8c1e5bb8e1c2..91aafdfecfe6141acc048c45cd43b9feac9f5ebf 100644
--- a/ash/default_accessibility_delegate.h
+++ b/ash/default_accessibility_delegate.h
@@ -30,6 +30,16 @@ class ASH_EXPORT DefaultAccessibilityDelegate : public AccessibilityDelegate {
   bool IsAutoclickEnabled() const override;
   void SetVirtualKeyboardEnabled(bool enabled) override;
   bool IsVirtualKeyboardEnabled() const override;
+  void SetCaretHighlightEnabled(bool enabled) override;
+  bool IsCaretHighlightEnabled() const override;
+  void SetCursorHighlightEnabled(bool enabled) override;
+  bool IsCursorHighlightEnabled() const override;
+  void SetFocusHighlightEnabled(bool enabled) override;
+  bool IsFocusHighlightEnabled() const override;
+  void SetSelectToSpeakEnabled(bool enabled) override;
+  bool IsSelectToSpeakEnabled() const override;
+  void SetSwitchAccessEnabled(bool enabled) override;
+  bool IsSwitchAccessEnabled() const override;
   bool ShouldShowAccessibilityMenu() const override;
   bool IsBrailleDisplayConnected() const override;
   void SilenceSpokenFeedback() const override;
@@ -50,6 +60,11 @@ class ASH_EXPORT DefaultAccessibilityDelegate : public AccessibilityDelegate {
   bool large_cursor_enabled_;
   bool autoclick_enabled_;
   bool virtual_keyboard_enabled_;
+  bool caret_highlight_enabled_;
+  bool cursor_highlight_enabled_;
+  bool focus_highligh_enabled_;
+  bool select_to_speak_enabled_;
+  bool switch_access_enabled_;
   ui::AccessibilityAlert accessibility_alert_;
   DISALLOW_COPY_AND_ASSIGN(DefaultAccessibilityDelegate);
 };