Bluetooth Extension API: Add a discovery API

chrome/renderer/resources/extensions/experimental.bluetooth_custom_bindings.js

+// 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.
+
+// Custom bindings for the Bluetooth API.
+
+var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
+var sendRequest = require('sendRequest').sendRequest;
+
+// 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('experimental.bluetooth', function(api) {
+  var apiFunctions = api.apiFunctions;
+
+  chromeHidden.bluetooth = {};
+  chromeHidden.bluetooth.handler = null;
+  chromeHidden.bluetooth.onDeviceDiscovered =
+      new chrome.Event("experimental.bluetooth.onDeviceDiscovered");
+
+  function deviceDiscoveredListener(device) {
+    if (chromeHidden.bluetooth.handler != null)
+      chromeHidden.bluetooth.handler(device);
+  }
+  chromeHidden.bluetooth.onDeviceDiscovered.addListener(
+      deviceDiscoveredListener);
+
+  apiFunctions.setHandleRequest('startDiscovery', function() {
+    var args = arguments;
+    if (args.length > 0 && args[0] && args[0].deviceCallback) {
+      chromeHidden.bluetooth.handler = args[0].deviceCallback;
+    }
+    sendRequest(this.name, args, this.definition.parameters);
+  });
+  apiFunctions.setHandleRequest('stopDiscovery', function() {
+    chromeHidden.bluetooth.handler = null;
+    sendRequest(this.name, args, this.definition.parameters);
+  });
+});