Add an accessibility API for events raised outside of the web content.

chrome/renderer/resources/extension_process_bindings.js

 // Copyright (c) 2009 The chrome Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This script contains privileged chrome extension related javascript APIs.
 // It is loaded by pages whose URL has the chrome-extension protocol.
 
 var chrome = chrome || {};
 (function() {
   native function GetExtensionAPIDefinition();
@@ skipping 533 matching lines @@
 
     setupBrowserActionEvent(extensionId);
     setupPageActionEvents(extensionId);
     setupToolstripEvents(GetRenderViewId());
     setupPopupEvents(GetRenderViewId());
   });
 
   if (!chrome.experimental)
     chrome.experimental = {};
 
+  if (!chrome.experimental.accessibility)
+    chrome.experimental.accessibility = {};
+
   if (!chrome.experimental.history)
     chrome.experimental.history = {};
 
   chrome.experimental.history.transistionType = {
     LINK: 0,
     TYPED: 1,
     AUTO_BOOKMARK: 2,
     AUTO_SUBFRAME: 3,
     MANUAL_SUBFRAME: 4,
     GENERATED: 5,
     START_PAGE: 6,
     FORM_SUBMIT: 7,
     RELOAD: 8,
     KEYWORD: 9,
     KEYWORD_GENERATED: 10
   };
 })();