Set keys for SwitchAccessEventHandler to capture using accessibiltyPrivate API

chrome/browser/accessibility/accessibility_extension_api.h

 // Copyright (c) 2012 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_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 32 matching lines @@
 
 // API function that darkens or undarkens the screen.
 class AccessibilityPrivateDarkenScreenFunction
     : public UIThreadExtensionFunction {
   ~AccessibilityPrivateDarkenScreenFunction() override {}
   ResponseAction Run() override;
   DECLARE_EXTENSION_FUNCTION("accessibilityPrivate.darkenScreen",
                              ACCESSIBILITY_PRIVATE_DARKENSCREEN)
 };
 
+// API function that sets the keys to be captured by Switch Access.

[Devlin, 2017/05/31 20:41:15]

We should be able to have this declaration only on CrOS.

[elichtenberg, 2017/06/01 19:55:27]

Done.

+class AccessibilityPrivateSetSwitchAccessKeysFunction
+    : public UIThreadExtensionFunction {
+  ~AccessibilityPrivateSetSwitchAccessKeysFunction() override {}
+  ResponseAction Run() override;
+  DECLARE_EXTENSION_FUNCTION("accessibilityPrivate.setSwitchAccessKeys",
+                             ACCESSIBILITY_PRIVATE_SETSWITCHACCESSKEYS)
+};
+
 #endif  // CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_H_