Update chrome.settingsPrivate to support CrOS-only settings.

chrome/test/data/extensions/api_test/settings_private/test.js

Index: chrome/test/data/extensions/api_test/settings_private/test.js
diff --git a/chrome/test/data/extensions/api_test/settings_private/test.js b/chrome/test/data/extensions/api_test/settings_private/test.js
index 28ac7f644ab45427c87e58512b6766ee265e1206..e61166889368df9ef8a70d96697f4060fb3dc388 100644
--- a/chrome/test/data/extensions/api_test/settings_private/test.js
+++ b/chrome/test/data/extensions/api_test/settings_private/test.js
@@ -28,6 +28,16 @@ var availableTests = [
           chrome.test.succeed();
         });
   },
+  function setPref_CrOSSetting() {
+    chrome.settingsPrivate.setPref(
+        'cros.accounts.allowBWSI',
+        false,
+        kTestPageId,
+        function(success) {
+          callbackResult(success);
+          chrome.test.succeed();
+        });
+  },
   function getPref() {
     chrome.settingsPrivate.getPref(
         kTestPrefName,
@@ -37,6 +47,15 @@ var availableTests = [
           chrome.test.succeed();
         });
   },
+  function getPref_CrOSSetting() {
+    chrome.settingsPrivate.getPref(
+        'cros.accounts.allowBWSI',
+        function(value) {
+          chrome.test.assertTrue(value !== null);
+          callbackResult(true);
+          chrome.test.succeed();
+        });
+  },
   function getAllPrefs() {
     chrome.settingsPrivate.getAllPrefs(
         function(prefs) {
@@ -60,6 +79,21 @@ var availableTests = [
         kTestPageId,
         function() {});
   },
+  function onPrefsChanged_CrOSSetting() {
+    chrome.settingsPrivate.onPrefsChanged.addListener(function(prefs) {
+      chrome.test.assertTrue(prefs.length > 0);
+      chrome.test.assertEq('cros.accounts.allowBWSI', prefs[0].key);
+      chrome.test.assertEq(false, prefs[0].value);
+      callbackResult(true);
+      chrome.test.succeed();
+    });
+
+    chrome.settingsPrivate.setPref(
+        'cros.accounts.allowBWSI',
+        false,
+        kTestPageId,
+        function() {});
+  },
 ];
 
 var testToRun = window.location.search.substring(1);