Add a test that is a repro case for bug 444945.

content/public/test/browser_test_utils.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 #define CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_
 
 #include <queue>
 #include <string>
 #include <vector>
@@ skipping 333 matching lines @@
                const NotificationDetails& details) override;
 
  private:
   NotificationRegistrar registrar_;
   std::queue<std::string> message_queue_;
   scoped_refptr<MessageLoopRunner> message_loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(DOMMessageQueue);
 };
 
+// Used to wait for a new WebContents to be created. Instantiate this object
+// before the operation that will create the window.
+class WebContentsAddedObserver {
+ public:
+  WebContentsAddedObserver();
+  ~WebContentsAddedObserver();
+
+  // Will run a message loop to wait for the new window if it hasn't been
+  // created since the constructor
+  WebContents* GetWebContents();
+
+  // Will tell whether RenderViewCreated Callback has invoked
+  bool RenderViewCreatedCalled();
+
+ private:
+  class RenderViewCreatedObserver;
+
+  void WebContentsCreated(WebContents* web_contents);
+
+  // Callback to WebContentCreated(). Cached so that we can unregister it.
+  base::Callback<void(WebContents*)> web_contents_created_callback_;
+
+  WebContents* web_contents_;
+  scoped_ptr<RenderViewCreatedObserver> child_observer_;
+  scoped_refptr<MessageLoopRunner> runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebContentsAddedObserver);
+};
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_BROWSER_TEST_UTILS_H_