Implementation of getCurrentProxySettings for proxy settings API.

chrome/test/data/extensions/api_test/proxy/auto/test.js

 // Copyright (c) 2010 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.
 
 // proxy api test
 // browser_tests.exe --gtest_filter=ExtensionApiTest.ProxyAutoSettings
 
+function expect(expected, message) {
+  return chrome.test.callbackPass(function(value) {
+    chrome.test.assertEq(expected, value, message);
+  });
+}
+
 chrome.test.runTests([
   function setAutoSettings() {
     var config = {
-      mode: "auto_detect",
+      mode: "auto_detect"
     };
     chrome.experimental.proxy.useCustomProxySettings(config);
-    chrome.test.succeed();
+    chrome.experimental.proxy.getCurrentProxySettings(
+        false,
+        expect(config, "invalid proxy settings"));
+    chrome.experimental.proxy.getCurrentProxySettings(
+        true,
+        expect(config, "invalid proxy settings"));
   }
 ]);