Added method getCaptivePortalStatus to networkingPrivate extension.

chrome/test/data/extensions/api_test/networking/test.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.
 
 var callbackPass = chrome.test.callbackPass;
 var callbackFail = chrome.test.callbackFail;
 var assertTrue = chrome.test.assertTrue;
 var assertFalse = chrome.test.assertFalse;
 var assertEq = chrome.test.assertEq;
 
@@ skipping 363 matching lines @@
       callbackPass(function(result) {
         assertEq("Connected", result);
       }));
   },
   function getWifiTDLSStatus() {
     chrome.networkingPrivate.getWifiTDLSStatus(
       "aa:bb:cc:dd:ee:ff",
       callbackPass(function(result) {
         assertEq("Connected", result);
       }));
+  },
+  function getCaptivePortalStatus() {
+    var networks = [['stub_ethernet', 'Online'],
+                    ['stub_wifi1', 'Offline'],
+                    ['stub_wifi2', 'Portal'],
+                    ['stub_cellular1', 'ProxyAuthRequired'],
+                    ['stub_vpn1', 'Unknown']];
+    networks.forEach(function(network) {
+      var servicePath = network[0];
+      var expectedStatus = network[1];
+      chrome.networkingPrivate.getCaptivePortalStatus(
+        servicePath,
+        callbackPass(function(status) {
+          assertEq(expectedStatus, status);
+        }));
+    });
   }
 ];
 
 var testToRun = window.location.search.substring(1);
 chrome.test.runTests(availableTests.filter(function(op) {
   return op.name == testToRun;
 }));