Test BlockingLoginTestInstance with enabled webview

chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc

Index: chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc
index 392968018c716d363f7168a304d3e52208971dd3..c5ed8ab06a01f82da3b823723586ba6dcfcfd601 100644
--- a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc
+++ b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.cc
@@ -13,6 +13,8 @@
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/login/helper.h"
+#include "chrome/browser/chromeos/login/session/user_session_manager.h"
+#include "chrome/browser/chromeos/login/startup_utils.h"
 #include "chrome/browser/chromeos/policy/policy_oauth2_token_fetcher.h"
 #include "chrome/browser/chromeos/policy/user_cloud_policy_manager_factory_chromeos.h"
 #include "chrome/browser/chromeos/policy/wildcard_login_checker.h"
@@ -212,7 +214,13 @@ void UserCloudPolicyManagerChromeOS::OnInitializationCompleted(
   // access token is already available.
   if (!client()->is_registered()) {
     if (wait_for_policy_fetch_) {
-      FetchPolicyOAuthTokenUsingSigninContext();
+      if (chromeos::StartupUtils::IsWebviewSigninEnabled()) {
+        OnAccessTokenAvailable(chromeos::UserSessionManager::GetInstance()
+                                   ->get_user_context()
+                                   .GetAccessToken());
+      } else {
+        FetchPolicyOAuthTokenUsingSigninContext();
+      }
     } else if (!access_token_.empty()) {
       OnAccessTokenAvailable(access_token_);
     }