Multi-monitor extension API.

chrome/renderer/resources/extensions/system_info_display_custom_bindings.js

+// Copyright (c) 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.
+
+// Custom bindings for the Bluetooth API.
+
+var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
+var sendRequest = require('sendRequest').sendRequest;
+var lastError = require('lastError');
+
+// Use custom bindings to create an undocumented event listener that will
+// receive events about device discovery and call the event listener that was
+// provided with the request to begin discovery.
+chromeHidden.registerCustomHook('systemInfo.display', function(api) {
+  chromeHidden.display = {};
+  chromeHidden.display.onDisplayChanged =
+      new chrome.Event("systemInfo.display.onDisplayChanged");
+});