Add base::RunLoop and update ui_test_utils to use it to reduce flakiness

chrome/browser/crash_recovery_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 "base/file_path.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
@@ skipping 57 matching lines @@
 IN_PROC_BROWSER_TEST_F(CrashRecoveryBrowserTest, LoadInNewTab) {
   const FilePath::CharType* kTitle2File = FILE_PATH_LITERAL("title2.html");
 
   ui_test_utils::NavigateToURL(browser(),
       ui_test_utils::GetTestUrl(FilePath(FilePath::kCurrentDirectory),
                                 FilePath(kTitle2File)));
 
   string16 title_before_crash;
   string16 title_after_crash;
 
+  // Wait for MessageLoop to go idle to make sure title is set.
+  ui_test_utils::RunAllPendingInMessageLoop();
   ASSERT_TRUE(ui_test_utils::GetCurrentTabTitle(browser(),
                                                 &title_before_crash));
   SimulateRendererCrash(browser());
   ui_test_utils::WindowedNotificationObserver observer(
       content::NOTIFICATION_LOAD_STOP,
       content::Source<NavigationController>(
           &browser()->GetActiveWebContents()->GetController()));
   browser()->Reload(CURRENT_TAB);
   observer.Wait();
+
+  // Wait for MessageLoop to go idle to make sure title is set.
+  ui_test_utils::RunAllPendingInMessageLoop();
   ASSERT_TRUE(ui_test_utils::GetCurrentTabTitle(browser(),
                                                 &title_after_crash));
   EXPECT_EQ(title_before_crash, title_after_crash);
 }