Added method getCaptivePortalStatus to networkingPrivate extension.

chrome/common/extensions/api/networking_private.json

 // 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.
 
 [
   {
     "namespace":"networkingPrivate",
     "description": "none",
     "compiler_options": {
       "implemented_in": "chrome/browser/extensions/api/networking_private/networking_private_api.h"
@@ skipping 41 matching lines @@
           "deviceBssid": {
             "type": "string",
             "description": "A string containing the BSSID of the device.  Only set if the device has already been setup."
           }
         }
       },
       {
         "id": "NetworkType",
         "type": "string",
         "enum": ["Ethernet", "WiFi", "Cellular"]
+      },
+      {
+        "id": "CaptivePortalStatus",
+        "type": "string",
+        "enum": ["Unknown", "Offline", "Online", "Portal", "ProxyAuthRequired"]
       }
     ],
     "functions": [
       {
         "name": "getProperties",
         "description": "Gets all the properties of the network with id networkGuid.  Includes all properties of the network (read-only and read/write values).",
         "parameters": [
           {
             "name": "networkGuid",
             "type": "string",
@@ skipping 323 matching lines @@
             "type": "function",
             "parameters": [
               {
                 "name": "status",
                 "type": "string"
               }
             ],
             "description": "A callback function that receives a string with the current TDLS status which can be 'Connected', 'Disabled', 'Disconnected', 'Nonexistent', or 'Unknown'"
           }
         ]
+      },
+      {
+        "name": "getCaptivePortalStatus",
+        "description": "Returns captive portal status for the network with networkGuid.",
+        "parameters": [
+          {
+            "name": "networkGuid",
+            "type": "string",
+            "description": "The unique identifier of the network to get captive portal status."
+          },
+          {
+            "name": "callback",
+            "type": "function",
+            "parameters": [
+              {
+                "name": "status",
+                "$ref": "CaptivePortalStatus",
+                "description": "Results of the query for network captive portal status."
+              }
+            ]
+          }
+        ]
       }
     ],
     "events": [
       {
         "name": "onNetworksChanged",
         "type": "function",
         "description": "Fired when the properties change on any of the networks.  Sends a list of identifiers for networks whose properties have changed.",
         "parameters": [
           {
             "name": "changes",
@@ skipping 10 matching lines @@
           {
             "name": "changes",
             "type": "array",
             "items": { "type": "string" }
           }
         ]
       }
     ]
   }
 ]