ChromeOS: Expose 'device type' signal

chrome/test/data/extensions/api_test/chromeos_info_private/extended/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.
 
 chrome.app.runtime.onLaunched.addListener(function() {
   chrome.test.getConfig(function(config) {
     var testName = config.customArg;
     if (!testName) {
       chrome.test.fail("Missing test name.");
       return;
     }
     chrome.chromeosInfoPrivate.get([
       'sessionType',
       'playStoreStatus',
-      'managedDeviceStatus'
+      'managedDeviceStatus',
+      'deviceType'
     ], chrome.test.callbackPass(function(values) {
           switch (testName) {
             case 'kiosk':
               chrome.test.assertEq('kiosk', values['sessionType']);
               break;
             case 'arc not-available':
               chrome.test.assertEq('not available', values['playStoreStatus']);
               break;
             case 'arc available':
               chrome.test.assertEq('available', values['playStoreStatus']);
               break;
             case 'arc enabled':
               chrome.test.assertEq('enabled', values['playStoreStatus']);
               break;
             case 'managed':
               chrome.test.assertEq('managed', values['managedDeviceStatus']);
+              break;
+            case 'chromebase':
+              chrome.test.assertEq('chromebase', values['deviceType']);
+              break;
+            case 'chromebit':
+              chrome.test.assertEq('chromebit', values['deviceType']);
+              break;
+            case 'chromebook':
+              chrome.test.assertEq('chromebook', values['deviceType']);
+              break;
+            case 'chromebox':
+              chrome.test.assertEq('chromebox', values['deviceType']);
+              break;
+            case 'unknown device type':
+              chrome.test.assertEq('chromedevice', values['deviceType']);
           }
         }));
   });
 });