ChromeOS: GAIA screen should support API v2.

chrome/browser/resources/chromeos/login/screen_gaia_signin.html

Index: chrome/browser/resources/chromeos/login/screen_gaia_signin.html
diff --git a/chrome/browser/resources/chromeos/login/screen_gaia_signin.html b/chrome/browser/resources/chromeos/login/screen_gaia_signin.html
index bf86215b4f9d0292d693f0b7488799a862de4941..e10aaca9ecb66c34183ea06494b18f704b83340d 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.html
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.html
@@ -2,7 +2,21 @@
 
 <div class="step right hidden no-logo" id="gaia-signin" role="group"
     aria-live="polite" hidden>
-  <div class="step-contents">
+  <link rel="stylesheet" href="oobe_dialog_parameters.css">
+  <oobe-dialog id="signin-frame-dialog" role="dialog" has-buttons no-header
+      no-footer-padding hidden>
+    <div id="signin-frame-container-v2" class="footer flex layout vertical">
+    </div>
+    <div class="bottom-buttons flex layout horizontal">
+      <oobe-back-button id="signin-back-button">
+      </oobe-back-button>
+      <div class="flex">
+      </div>
+      <oobe-next-button inverse disabled>
+      </oobe-next-button>
+    </div>
+  </oobe-dialog>
+  <div id="gaia-step-contents" class="step-contents">
     <div id="gaia-signin-form-container">
       <webview id="signin-frame" name="signin-frame" hidden></webview>
       <offline-gaia id="offline-gaia" class="fit" hidden></offline-gaia>