Use embedded sign in UI for inline sign in flow

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
index 33d344c2890cf833ecb67862e07eb6e9d4ec8255..3735ae7c9cf957ea7175affd9b9393f867672f01 100644
--- a/chrome/browser/resources/gaia_auth/util.js
+++ b/chrome/browser/resources/gaia_auth/util.js
@@ -25,3 +25,20 @@ function getUrlSearchParams(search) {
 
   return params;
 }
+
+/**
+ * Creates a new URL which is the old URL with a GET param of key=value.
+ * Copied from ui/webui/resources/js/util.js.
+ * @param {string} url The base URL. There is not sanity checking on the URL so
+ *     it must be passed in a proper format.
+ * @param {string} key The key of the param.
+ * @param {string} value The value of the param.
+ * @return {string} The new URL.
+ */
+function appendParam(url, key, value) {
+  var param = encodeURIComponent(key) + '=' + encodeURIComponent(value);
+
+  if (url.indexOf('?') == -1)
+    return url + '?' + param;
+  return url + '&' + param;
+}