Fix SAML single-password scrapping authenticating with an empty password

chrome/browser/chromeos/login/saml/saml_browsertest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cstring>
 #include <memory>
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 475 matching lines @@
                 SystemSaltGetter::ConvertRawSaltToHexString(
                     FakeCryptohomeClient::GetStubSystemSalt()));
   EXPECT_EQ(key.GetSecret(), cryptohome_client_->salted_hashed_secret());
 }
 
 // Tests the single password scraped flow.
 IN_PROC_BROWSER_TEST_F(SamlTest, ScrapedSingle) {
   fake_saml_idp()->SetLoginHTMLTemplate("saml_login.html");
   StartSamlAndWaitForIdpPageLoad(kFirstSAMLUserEmail);
 
+  // Make sure that the password is scraped correctly.
+  ASSERT_TRUE(content::ExecuteScript(
+      GetLoginUI()->GetWebContents(),
+      "$('gaia-signin').gaiaAuthHost_.addEventListener('authCompleted',"
+      "    function(e) {"
+      "      var password = e.detail.password;"
+      "      window.domAutomationController.setAutomationId(0);"
+      "      window.domAutomationController.send(password);"
+      "    });"));
+
   // Fill-in the SAML IdP form and submit.
   SetSignFormField("Email", "fake_user");
   SetSignFormField("Password", "fake_password");
 
   // Scraping a single password should finish the login and start the session.
   content::WindowedNotificationObserver session_start_waiter(
       chrome::NOTIFICATION_SESSION_STARTED,
       content::NotificationService::AllSources());
+  content::DOMMessageQueue message_queue;
   ExecuteJsInSigninFrame("document.getElementById('Submit').click();");
+  std::string message;
+  do {
+    ASSERT_TRUE(message_queue.WaitForMessage(&message));
+  } while (message != "\"fake_password\"");
+
   session_start_waiter.Wait();
 }
 
 // Tests password scraping from a dynamically created password field.
 IN_PROC_BROWSER_TEST_F(SamlTest, ScrapedDynamic) {
   fake_saml_idp()->SetLoginHTMLTemplate("saml_login.html");
   StartSamlAndWaitForIdpPageLoad(kFirstSAMLUserEmail);
 
   ExecuteJsInSigninFrame(
     "(function() {"
@@ skipping 829 matching lines @@
 
   // Scraping one password should finish login.
   content::WindowedNotificationObserver session_start_waiter(
       chrome::NOTIFICATION_SESSION_STARTED,
       content::NotificationService::AllSources());
   ExecuteJsInSigninFrame("document.getElementById('Submit').click();");
   session_start_waiter.Wait();
 }
 
 }  // namespace chromeos