ChromeOS: GAIA screen should support API v2.

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

Index: chrome/browser/resources/chromeos/login/screen_gaia_signin.css
diff --git a/chrome/browser/resources/chromeos/login/screen_gaia_signin.css b/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
index e3cc80d7bed623f9ea4e9c322c053ddea5bf5446..a3211cab6967e99ec0fe3ee63baafea39bd1d914 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
@@ -12,6 +12,12 @@
   width: 562px;
 }
 
+#gaia-signin.v2 {
+  height: unset;
+  padding: unset;
+  width: unset;
+}
+
 .signin-link {
   color: rgb(37, 79, 155);
   cursor: pointer;
@@ -43,6 +49,12 @@
   transition: opacity 500ms ease-out;
 }
 
+#signin-frame-container-v2 #signin-frame {
+  height: 560px;
+  position: static;
+  width: 768px;
+}
+
 #gaia-signin .step-contents {
   -webkit-box-pack: center;
   display: -webkit-box;
@@ -107,3 +119,11 @@
   color: rgba(0, 0, 0, .54);
 }
 
+#gaia-signin.v2 #gaia-navigation,
+#gaia-signin.v2 #gaia-step-contents {
+  display: none;
+}
+
+#gaia-signin:not(.v2) #signin-frame-dialog {
+  display: none;
+}