Implement create attribute API functions for BTLE.

chrome/test/data/extensions/api_test/bluetooth_low_energy/create_service/runtest.js

+// Copyright 2016 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.
+
+function failOnError(result) {
+  if (chrome.runtime.lastError || !result) {
+    chrome.test.fail(chrome.runtime.lastError.message);
+    return true;
+  }
+  return false;
+}
+
+var service = { uuid: '00001234-0000-1000-8000-00805f9b34fb', isPrimary: true }
+chrome.bluetoothLowEnergy.createService(service, function(result) {
+  if (failOnError(result))
+    return;
+  chrome.test.succeed();
+});