Implement a policy to autologin a public account.

chrome/browser/chromeos/login/mock_login_display.cc

Index: chrome/browser/chromeos/login/mock_login_display.cc
diff --git a/chrome/browser/chromeos/login/mock_login_display.cc b/chrome/browser/chromeos/login/mock_login_display.cc
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+++ b/chrome/browser/chromeos/login/mock_login_display.cc
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+// Copyright 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 "chrome/browser/chromeos/login/mock_login_display.h"
+
+#include "chrome/browser/chromeos/login/help_app_launcher.h"
+#include "chrome/browser/chromeos/login/user.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "ui/gfx/rect.h"
+
+namespace chromeos {
+
+MockLoginDisplay::MockLoginDisplay() : LoginDisplay(NULL, gfx::Rect()) {
+}
+
+MockLoginDisplay::~MockLoginDisplay() {
+}
+
+}  // namespace chromeos