Show ChromeVox caption panel when spoken feedback is enabled.

chrome/browser/ui/ash/chrome_shell_delegate_views.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/ui/ash/chrome_shell_delegate.h"
 
 #include <vector>
 
 #include "ash/accessibility_delegate.h"
 #include "ash/media_delegate.h"
@@ skipping 107 matching lines @@
   ui::AccessibilityAlert GetLastAccessibilityAlert() override {
     return ui::A11Y_ALERT_NONE;
   }
 
   void PlayEarcon(int sound_key) override {}
 
   base::TimeDelta PlayShutdownSound() const override {
     return base::TimeDelta();
   }
 
+  void ComputeWorkAreaInsets(aura::Window* root_window,
+                             gfx::Insets* out_insets) const override {}
+
  private:
   DISALLOW_COPY_AND_ASSIGN(EmptyAccessibilityDelegate);
 };
 
 }  // namespace
 
 bool ChromeShellDelegate::IsFirstRunAfterBoot() const {
   return false;
 }
 
@@ skipping 105 matching lines @@
                  chrome::NOTIFICATION_PROFILE_ADDED,
                  content::NotificationService::AllSources());
   registrar_.Add(this,
                  chrome::NOTIFICATION_ASH_SESSION_STARTED,
                  content::NotificationService::AllSources());
   registrar_.Add(this,
                  chrome::NOTIFICATION_ASH_SESSION_ENDED,
                  content::NotificationService::AllSources());
 #endif
 }