Host Chrome OS GAIA signin page in webview

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

Index: chrome/browser/resources/chromeos/login/screen_gaia_signin.js
diff --git a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
index 89e6671656c1e7f9258a06aed4b31464307b4673..ce0cd39a614f976c57e6d5a2f6470d590702c35d 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
@@ -6,8 +6,6 @@
  * @fileoverview Oobe signin screen implementation.
  */
 
-<include src="../../gaia_auth_host/gaia_auth_host.js">
-
 login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
   // Gaia loading time after which error message must be displayed and
   // lazy portal check should be fired.
@@ -89,9 +87,48 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
      */
     samlPasswordConfirmAttempt_: 0,
 
+    /**
+     * Whether we should show webview based signin.
+     * @type {boolean}
+     * @private
+     */
+    isWebviewSignin: false,
+
     /** @override */
     decorate: function() {
-      this.gaiaAuthHost_ = new cr.login.GaiaAuthHost($('signin-frame'));
+      this.isWebviewSignin = loadTimeData.getValue('isWebviewSignin');
+      if (this.isWebviewSignin) {
+        /**
+        * A listener class for authentication events from GaiaAuthHost.
+        * @constructor
+        * @implements {cr.login.GaiaAuthHost.Listener}
+        */
+        function GaiaAuthHostListener(gaia_screen) {
+          this.gaia_screen_ = gaia_screen;
+        }
+
+        /** @override */
+        GaiaAuthHostListener.prototype.onSuccess = function(credentials) {
+          this.gaia_screen_.onAuthCompleted_(credentials);
+        };
+
+        /** @override */
+        GaiaAuthHostListener.prototype.onReady = function(e) {
+          this.gaia_screen_.onAuthReady_();
+        };
+
+        // Replace iframe with webview.
+        var webview = this.ownerDocument.createElement('webview');
+        webview.id = 'signin-frame';
+        webview.name = 'signin-frame';
+        // TODO(dpolukhin): webview doesn't load page in hidden state,
+        // use curtain instead.
+        $('signin-frame').parentNode.replaceChild(webview, $('signin-frame'));
+        this.gaiaAuthHost_ = new cr.login.GaiaAuthHost(
+            webview, new GaiaAuthHostListener(this));
+      } else {
+        this.gaiaAuthHost_ = new cr.login.GaiaAuthHost($('signin-frame'));
+      }
       this.gaiaAuthHost_.addEventListener(
           'ready', this.onAuthReady_.bind(this));
       this.gaiaAuthHost_.confirmPasswordCallback =
@@ -112,7 +149,6 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
         e.preventDefault();
       });
 
-
       this.updateLocalizedContent();
     },
 
@@ -148,7 +184,10 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
      */
     showLoadingUI_: function(show) {
       $('gaia-loading').hidden = !show;
-      this.gaiaAuthHost_.frame.hidden = show;
+      if (!this.isWebviewSignin) {
+        // TODO(dpolukhin): proper implement curtain for webview signin.
+        this.gaiaAuthHost_.frame.hidden = show;
+      }
       $('signin-right').hidden = show;
       $('enterprise-info-container').hidden = show;
       $('gaia-signin-divider').hidden = show;