Add a SigninAllowed policy.

chrome/browser/ui/webui/ntp/new_tab_page_sync_handler_browsertest.cc

+// Copyright (c) 2012 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/ui/webui/ntp/new_tab_page_sync_handler.h"
+
+#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/common/url_constants.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/testing_profile.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_ui.h"
+#include "content/public/test/browser_test_utils.h"
+#include "googleurl/src/gurl.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+using ::testing::_;
+
+class NewTabPageSyncHandlerBrowserTest : public InProcessBrowserTest {

[sail, 2013/02/08 20:18:57]

If this class doesn't do anything then just do:
  typedef InProcessBrowserTest  NewTabPageSyncHandlerBrowserTest

[Adrian Kuegel, 2013/02/11 16:47:30]

Done.

+ public:
+  NewTabPageSyncHandlerBrowserTest() {}
+};
+
+class NewTabPageSyncHandlerTest : public NewTabPageSyncHandler {

[sail, 2013/02/08 20:18:57]

I think names ending in Test are mostly reserved for tests. Rename to something
like MockNewTabPageSyncHandler.

[Adrian Kuegel, 2013/02/11 16:47:30]

Done.

+ public:
+  MOCK_METHOD3(SendSyncMessageToPage, void(MessageType type, std::string msg,
+      std::string linktext));
+  void SetWaitingForInitialPageLoad(bool waiting) {
+    waiting_for_initial_page_load_ = waiting;
+  }
+  MessageType GetHideType() {
+    return HIDE;
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(NewTabPageSyncHandlerBrowserTest,
+    ChangeSigninAllowedToFalse) {

[sail, 2013/02/08 20:18:57]

move beneath the "N" for NewTab

[Adrian Kuegel, 2013/02/11 16:47:30]

Done.

+  ui_test_utils::NavigateToURL(browser(), GURL(chrome::kChromeUINewTabURL));
+  content::WebUI* web_ui =
+      browser()->tab_strip_model()->GetActiveWebContents()->GetWebUI();
+  NewTabPageSyncHandlerTest* mock_handler = new NewTabPageSyncHandlerTest();
+  mock_handler->SetWaitingForInitialPageLoad(false);
+  web_ui->AddMessageHandler(mock_handler);
+  EXPECT_CALL(*mock_handler, SendSyncMessageToPage(
+      mock_handler->GetHideType(), _, _));
+  browser()->profile()->GetPrefs()->SetBoolean(prefs::kSigninAllowed, false);
+}