[Extensions Bindings] Add a bridge to use current custom bindings

chrome/test/data/extensions/api_test/native_bindings/background.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.
+
+if (!chrome || !chrome.test)
+  throw new Error('chrome.test is undefined');
+
+// This is a good end-to-end test for two reasons. The first is obvious - it
+// tests a simple API and makes sure it behaves as expected, as well as testing
+// that other APIs are unavailable.
+// The second is that chrome.test is itself an extension API, and a rather
+// complex one. It requires both traditional bindings (renderer parses args,
+// passes info to browser process, browser process does work and responds, re-
+// enters JS) and custom JS bindings (in order to have our runTests, assert*
+// methods, etc). If any of these stages failed, the test itself would also
+// fail.
+chrome.test.runTests([
+  function idleApi() {
+    chrome.test.assertTrue(!!chrome.idle);
+    chrome.test.assertTrue(!!chrome.idle.queryState);
+    chrome.idle.queryState(1000, function(state) {
+      // TODO(devlin): Update this to use chrome.idle.IdleState.ACTIVE when we
+      // have enums in native bindings.
+      chrome.test.assertEq('active', state);
+      chrome.test.succeed();
+    });
+  },
+  function nonexistentApi() {
+    chrome.test.assertFalse(!!chrome.nonexistent);
+    chrome.test.succeed();
+  },
+  function disallowedApi() {
+    chrome.test.assertFalse(!!chrome.power);
+    chrome.test.succeed();
+  },
+]);