Add a11y on-screen keyboard to accessibility menu on system tray.

chrome/browser/ui/ash/chrome_shell_delegate_views.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate_views.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate_views.cc b/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
index 0580ea4239cd33b5cfa5e0745f293f0c922b637d..7a96d7256a09e354dbe6c0392fb7172d1dfd0ea5 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate_views.cc
@@ -123,6 +123,9 @@ class EmptyAccessibilityDelegate : public ash::AccessibilityDelegate {
   virtual void SilenceSpokenFeedback() const OVERRIDE {
   }
 
+  virtual void SetVirtualKeyboardEnabled(bool enabled) OVERRIDE {
+  }
+
   virtual bool IsVirtualKeyboardEnabled() const OVERRIDE {
     return false;
   }