Fix for flakiness in pyauto automation hook WaitForDownloadsToComplete.

chrome/test/functional/translate.py

 #!/usr/bin/python
 # 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.
 
 import glob
 import logging
 import os
 import shutil
 import tempfile
@@ skipping 414 matching lines @@
     # be given unicode strings to "do the right thing" on win.
     # Ref: http://boodebr.org/main/python/all-about-python-and-unicode
     try:
       for filename in crazy_filenames:  # filename is unicode.
         utf8_filename = filename.encode('utf-8')
         file_path = os.path.join(temp_dir, utf8_filename)
         _CreateFile(os.path.join(temp_dir, filename))  # unicode file.
         file_url = self.GetFileURLForPath(file_path)
         downloaded_file = os.path.join(download_dir, filename)
         os.path.exists(downloaded_file) and os.remove(downloaded_file)
+        pre_download_ids = [x['id']
+                            for x in self.GetDownloadsInfo().Downloads()]
         self.DownloadAndWaitForStart(file_url)
         # Wait for files and remove them as we go.
-        self.WaitForAllDownloadsToComplete()
+        self.WaitForAllDownloadsToComplete(pre_download_ids)
         os.path.exists(downloaded_file) and os.remove(downloaded_file)
     finally:
       shutil.rmtree(unicode(temp_dir))  # unicode so that win treats nicely.
 
   def testHistoryNotTranslated(self):
     """Tests navigating to History page with other languages."""
     # Build the history with non-English content.
     history_file = os.path.join(
         self.DataDir(), 'translate', 'crazy_history.txt')
     history_items = self.EvalDataFrom(history_file)
@@ skipping 63 matching lines @@
   def testNoTranslateInfobarAfterNeverTranslate(self):
     """Verify Translate Info bar should not stay on the page after opting
        Never translate the page"""
     url = self._GetDefaultSpanishURL()
     self._NavigateAndWaitForBar(url)
     self.SelectTranslateOption('never_translate_language')
     self.assertFalse(self.GetBrowserInfo()['windows'][0]['tabs'][0]['infobars'])
 
 if __name__ == '__main__':
   pyauto_functional.Main()