Add PrerenderUnload browser test

chrome/test/ui_test_utils.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_TEST_UI_TEST_UTILS_H_
 #define CHROME_TEST_UI_TEST_UTILS_H_
 #pragma once
 
 #include <map>
 #include <queue>
@@ skipping 453 matching lines @@
       details_[source.map_key()] = *details_ptr;
     WindowedNotificationObserver::Observe(type, source, details);
   }
 
  private:
   std::map<uintptr_t, U> details_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowedNotificationObserverWithDetails);
 };
 
+// Watches title changes on a tab, blocking until an expected title is set.
+class TitleWatcher : public NotificationObserver {
+ public:
+  // |tab_contents| must be non-NULL and needs to stay alive for the
+  // entire lifetime of |this|. |expected_title| is the title that |this|
+  // will wait for.
+  TitleWatcher(TabContents* tab_contents, const string16& expected_title);
+  ~TitleWatcher();
+
+  // Waits until the title for the tab is set to the |expected_title|
+  // passed into the constructor.
+  bool Wait() WARN_UNUSED_RESULT;
+
+ private:
+  // NotificationObserver
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details) OVERRIDE;
+
+  TabContents* expected_tab_;
+  string16 expected_title_;
+  NotificationRegistrar notification_registrar_;
+  bool title_observed_;
+  bool quit_loop_on_observation_;
+
+  DISALLOW_COPY_AND_ASSIGN(TitleWatcher);
+};
+
 // See SendKeyPressAndWait.  This function additionally performs a check on the
 // NotificationDetails using the provided Details<U>.
 template <class U>
 bool SendKeyPressAndWaitWithDetails(
     const Browser* browser,
     ui::KeyboardCode key,
     bool control,
     bool shift,
     bool alt,
     bool command,
@@ skipping 67 matching lines @@
 
 // Takes a snapshot of the entire page, according to the width and height
 // properties of the DOM's document. Returns true on success. DOMAutomation
 // must be enabled.
 bool TakeEntirePageSnapshot(RenderViewHost* rvh,
                             SkBitmap* bitmap) WARN_UNUSED_RESULT;
 
 }  // namespace ui_test_utils
 
 #endif  // CHROME_TEST_UI_TEST_UTILS_H_