Extract ResultCatcher from ExtensionApiTest. Use it in ShellApiTest.

extensions/test/data/api_test/dns/api/background.js

 // Copyright (c) 2012 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.
 
+console.log('background loaded test test DEBUGYOZ');

[James Cook, 2014/09/03 18:08:41]

do you still need this line?

[Yoyo Zhou, 2014/09/04 21:57:42]

No.

+
 var testIPLiteralResolution = function() {
   var callback = function(resolveInfo) {
     chrome.test.assertEq(0, resolveInfo.resultCode);
     chrome.test.assertEq("127.0.0.1", resolveInfo.address);
     chrome.test.succeed("IP literal resolved");
   };
   chrome.dns.resolve("127.0.0.1", callback);
 };
 
 var testHostnameResolution = function() {
@@ skipping 10 matching lines @@
     // NET_ERROR(NAME_NOT_RESOLVED, -105)
     chrome.test.assertEq(-105, resolveInfo.resultCode);
     chrome.test.succeed("hostname correctly failed to resolve");
   };
   chrome.dns.resolve("this.hostname.is.bogus", callback);
 };
 
 chrome.test.runTests([testIPLiteralResolution,
                       testHostnameResolution,
                       testNonexistentHostnameResolution]);