Add getGlobalPolicy to networkingPrivate API.

chrome/test/data/extensions/api_test/networking_private/chromeos/test.js

Index: chrome/test/data/extensions/api_test/networking_private/chromeos/test.js
diff --git a/chrome/test/data/extensions/api_test/networking_private/chromeos/test.js b/chrome/test/data/extensions/api_test/networking_private/chromeos/test.js
index 51c3de117d0fb3809499b4fbca96c31ddfd589c5..28bca7f5064c15f4b000791e904bc2b28675d46f 100644
--- a/chrome/test/data/extensions/api_test/networking_private/chromeos/test.js
+++ b/chrome/test/data/extensions/api_test/networking_private/chromeos/test.js
@@ -873,7 +873,15 @@ var availableTests = [
                 }));
           }));
     })));
-  }
+  },
+  function getGlobalPolicy() {
+    chrome.networkingPrivate.getGlobalPolicy(callbackPass(function(result) {
+      assertEq({
+        AllowOnlyPolicyNetworksToAutoconnect: true,
+        AllowOnlyPolicyNetworksToConnect: false,
+      }, result);
+    }));
+  },
 ];
 
 chrome.test.getConfig(function(config) {