Add regression test for bug 7900 and necessary infrastructure....

chrome/test/automation/automation_proxy.h

 // Copyright (c) 2006-2008 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_AUTOMATION_AUTOMATION_PROXY_H__
 #define CHROME_TEST_AUTOMATION_AUTOMATION_PROXY_H__
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 101 matching lines @@
                                 views::DialogDelegate::DialogButton* button);
 
   // Simulates a click on a dialog button.
   bool ClickAppModalDialogButton(views::DialogDelegate::DialogButton button);
 #endif  // defined(OS_WIN)
 
   // Block the thread until a modal dialog is displayed. Returns true on
   // success.
   bool WaitForAppModalDialog(int wait_timeout);
 
+  // Block the thread until one of the tabs in any window (including windows
+  // opened after the call) displays given url. Returns true on success.
+  bool WaitForURLDisplayed(GURL url, int wait_timeout);
+
   // Returns the BrowserProxy for the browser window at the given index,
   // transferring ownership of the pointer to the caller.
   // On failure, returns NULL.
   //
   // Use GetBrowserWindowCount to see how many browser windows you can ask for.
   // Window numbers are 0-based.
   BrowserProxy* GetBrowserWindow(int window_index);
 
   // Returns the BrowserProxy for the browser window which was last active,
   // transferring ownership of the pointer to the caller.
@@ skipping 82 matching lines @@
 
   AutomationRequest* current_request_;
 
   // Delay to let the browser execute the command.
   base::TimeDelta command_execution_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(AutomationProxy);
 };
 
 #endif  // CHROME_TEST_AUTOMATION_AUTOMATION_PROXY_H__