Allow navigation while a JavaScript dialog is up.

chrome/browser/ui/javascript_dialogs/javascript_dialog_browsertest.cc

+// Copyright 2016 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 "base/strings/utf_string_conversions.h"
+#include "base/test/scoped_feature_list.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/javascript_dialogs/javascript_dialog_tab_helper.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/common/chrome_features.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/test_utils.h"
+
+using JavaScriptDialogTest = InProcessBrowserTest;
+
+IN_PROC_BROWSER_TEST_F(JavaScriptDialogTest, ReloadDoesntHang) {
+  base::test::ScopedFeatureList feature_list;
+  feature_list.InitAndEnableFeature(features::kAutoDismissingDialogs);
+
+  content::WebContents* tab =
+      browser()->tab_strip_model()->GetActiveWebContents();
+  JavaScriptDialogTabHelper* js_helper =
+      JavaScriptDialogTabHelper::FromWebContents(tab);
+
+  // Show a dialog.
+
+  scoped_refptr<content::MessageLoopRunner> runner =
+      new content::MessageLoopRunner;
+  js_helper->SetDialogShownCallbackForTesting(runner->QuitClosure());
+  tab->GetMainFrame()->ExecuteJavaScriptForTests(base::UTF8ToUTF16("alert()"));
+  runner->Run();
+
+  // Try reloading.
+
+  tab->GetController().Reload(false);
+  content::WaitForLoadStop(tab);
+
+  // If the WaitForLoadStop doesn't hang forever, we've passed.
+}