Added chrome switch that lets tests override URL path, moved GAIA auth extension from CrOS

chrome/browser/resources/gaia_auth/util.js

Index: chrome/browser/resources/gaia_auth/util.js
diff --git a/chrome/browser/resources/gaia_auth/util.js b/chrome/browser/resources/gaia_auth/util.js
new file mode 100644
index 0000000000000000000000000000000000000000..787a7f2ca88ee0b5e3c35c42b106a2b63874a024
--- /dev/null
+++ b/chrome/browser/resources/gaia_auth/util.js
@@ -0,0 +1,27 @@
+// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function $(id) {
+  return document.getElementById(id);
+}
+
+function getUrlSearchParams(search) {
+  var params = {};
+
+  if (search) {
+    // Strips leading '?'
+    search = search.substring(1);
+    var pairs = search.split('&');
+    for (var i = 0; i < pairs.length; ++i) {
+      var pair = pairs[i].split('=');
+      if (pair.length == 2) {
+        params[pair[0]] = decodeURIComponent(pair[1]);
+      } else {
+        params[pair] = true;
+      }
+    }
+  }
+
+  return params;
+}