Upstream Chrome on iOS source code [2/11].

ios/chrome/browser/signin/signin_capability.cc

+// Copyright (c) 2013 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 "ios/chrome/browser/signin/signin_capability.h"
+
+#include "base/logging.h"
+#include "components/signin/core/browser/signin_error_controller.h"
+#include "components/signin/core/browser/signin_manager.h"
+#include "ios/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/chrome/browser/signin/signin_error_controller_factory.h"
+#include "ios/chrome/browser/signin/signin_manager_factory.h"
+
+bool CanPresentAutoLogin(ios::ChromeBrowserState* browser_state) {
+  // User must be signed in and not have an error.
+  SigninManager* signin =
+      ios::SigninManagerFactory::GetForBrowserState(browser_state);
+  DCHECK(signin);
+  std::string username = signin->GetAuthenticatedAccountInfo().email;
+  if (!username.length())
+    return false;
+  SigninErrorController* error_controller =
+      ios::SigninErrorControllerFactory::GetForBrowserState(browser_state);
+  DCHECK(error_controller);
+  return !error_controller->HasError();
+}