[page_load_metrics] Add a NavigationThrottle for richer abort metrics

content/browser/web_contents/web_contents_impl_browsertest.cc

 // 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 "base/macros.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "content/browser/frame_host/navigation_entry_impl.h"
@@ skipping 904 matching lines @@
   const GURL kCrossSiteURL(
       embedded_test_server()->GetURL("bar.com", "/title1.html"));
 
   // Navigate to a first web page with a BeforeUnload event listener.
   EXPECT_TRUE(NavigateToURL(shell(), kStartURL));
 
   // Start a cross-site navigation that will not commit for the moment.
   TestNavigationManager cross_site_delayer(shell()->web_contents(),
                                            kCrossSiteURL);
   shell()->LoadURL(kCrossSiteURL);
-  cross_site_delayer.WaitForWillStartRequest();
+  EXPECT_TRUE(cross_site_delayer.WaitForWillStartRequest());
 
   // Click on a link in the page. This will show the BeforeUnload dialog.
   // Ensure the dialog is not dismissed, which will cause it to still be
   // present when the cross-site navigation later commits.
   // Note: the javascript function executed will not do the link click but
   // schedule it for afterwards. Since the BeforeUnload event is synchronous,
   // clicking on the link right away would cause the ExecuteScript to never
   // return.
   SetShouldProceedOnBeforeUnload(shell(), false);
   EXPECT_TRUE(ExecuteScript(shell(), "clickLinkSoon()"));
@@ skipping 307 matching lines @@
   shell()->LoadURL(GURL("about:blank"));
   base::RunLoop run_loop;
   shell()->web_contents()->DownloadImage(
       kImageUrl, false, 2, false,
       base::Bind(&ExpectNoValidImageCallback, run_loop.QuitClosure()));
 
   run_loop.Run();
 }
 
 }  // namespace content