PlzNavigate: cancel any navigations if DispatchBeforeUnload is called (other than for starting a ...

content/browser/browser_side_navigation_browsertest.cc

 // Copyright 2014 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 <stdint.h>
 
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/site_isolation_policy.h"
+#include "content/public/browser/notification_types.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/public/test/test_navigation_observer.h"
 #include "content/shell/browser/shell.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
@@ skipping 242 matching lines @@
   console_delegate->Wait();
   // Original page shouldn't navigate away.
   EXPECT_EQ(kUrl, shell()->web_contents()->GetURL());
   EXPECT_FALSE(shell()
                    ->web_contents()
                    ->GetController()
                    .GetLastCommittedEntry()
                    ->IsViewSourceMode());
 }
 
+// Ensure that closing a page by running its beforeunload handler doesn't hang
+// if there's an ongoing navigation.
+IN_PROC_BROWSER_TEST_F(BrowserSideNavigationBrowserTest,
+                       UnloadDuringNavigation) {
+  content::WindowedNotificationObserver close_observer(
+      content::NOTIFICATION_WEB_CONTENTS_DESTROYED,
+      content::Source<content::WebContents>(shell()->web_contents()));
+  shell()->LoadURL(GURL("chrome://resources/css/tabs.css"));
+  shell()->web_contents()->DispatchBeforeUnload();
+  close_observer.Wait();
+}
+
 }  // namespace content