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diff --git a/chrome/browser/accessibility/accessibility_extension_api.h b/chrome/browser/accessibility/accessibility_extension_api.h
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+// Copyright (c) 2011 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 CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_H_
+#define CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_H_
+#pragma once
+
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
+#include "base/values.h"
+#include "chrome/browser/accessibility_events.h"
+#include "chrome/browser/extensions/extension_function.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+// Observes the profile and routes accessibility notifications as events
+// to the extension system.
+class ExtensionAccessibilityEventRouter : public content::NotificationObserver {
+ public:
+  // Single instance of the event router.
+  static ExtensionAccessibilityEventRouter* GetInstance();
+
+  // Get the dict representing the last control that received an
+  // OnControlFocus event.
+  DictionaryValue* last_focused_control_dict() {
+    return &last_focused_control_dict_;
+  }
+
+  // Accessibility support is disabled until an extension expicitly enables
+  // it, so that this extension api has no impact on Chrome's performance
+  // otherwise.  These methods handle enabling, disabling, and querying the
+  // status.
+  void SetAccessibilityEnabled(bool enabled);
+  bool IsAccessibilityEnabled() const;
+
+ private:
+  friend struct DefaultSingletonTraits<ExtensionAccessibilityEventRouter>;
+
+  ExtensionAccessibilityEventRouter();
+  virtual ~ExtensionAccessibilityEventRouter();
+
+  // content::NotificationObserver::Observe.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  void OnWindowOpened(const AccessibilityWindowInfo* details);
+  void OnWindowClosed(const AccessibilityWindowInfo* details);
+  void OnControlFocused(const AccessibilityControlInfo* details);
+  void OnControlAction(const AccessibilityControlInfo* details);
+  void OnTextChanged(const AccessibilityControlInfo* details);
+  void OnMenuOpened(const AccessibilityMenuInfo* details);
+  void OnMenuClosed(const AccessibilityMenuInfo* details);
+  void OnVolumeChanged(const AccessibilityVolumeInfo* details);
+  void OnScreenUnlocked(const ScreenUnlockedEventInfo* details);
+  void OnWokeUp(const WokeUpEventInfo* details);
+
+  void DispatchEvent(Profile* profile,
+                     const char* event_name,
+                     const std::string& json_args);
+
+  // Used for tracking registrations to history service notifications.
+  content::NotificationRegistrar registrar_;
+
+  DictionaryValue last_focused_control_dict_;
+
+  bool enabled_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionAccessibilityEventRouter);
+};
+
+// API function that enables or disables accessibility support.  Event
+// listeners are only installed when accessibility support is enabled, to
+// minimize the impact.
+class SetAccessibilityEnabledFunction : public SyncExtensionFunction {
+  virtual ~SetAccessibilityEnabledFunction() {}
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME(
+      "experimental.accessibility.setAccessibilityEnabled")
+};
+
+// API function that returns the most recent focused control.
+class GetFocusedControlFunction : public SyncExtensionFunction {
+  virtual ~GetFocusedControlFunction() {}
+  virtual bool RunImpl() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION_NAME(
+      "experimental.accessibility.getFocusedControl")
+};
+
+#endif  // CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_H_