Adding HTML5 track(caption) test case in PyAuto media functional tests.

chrome/test/functional/media/media_test_base.py

Index: chrome/test/functional/media/media_test_base.py
diff --git a/chrome/test/functional/media/media_test_base.py b/chrome/test/functional/media/media_test_base.py
index 59f6cbe93e6c9b2868a4167fe48019d92789528d..e18f682e2ed362c2e8b1de83701c82f77f74ce3c 100755
--- a/chrome/test/functional/media/media_test_base.py
+++ b/chrome/test/functional/media/media_test_base.py
@@ -13,6 +13,7 @@ media_test_runner.py is used for generating these variables
 """
 
 import csv
+import logging
 import os
 import time
 
@@ -145,6 +146,7 @@ class MediaTestBase(pyauto.PyUITest):
       url = self.url
       if self._test_scenarios:
         url += '&actions=' + self.test_scenarios[run_counter]
+      logging.debug('Navigate to %s', url)
       self.NavigateToURL(url)
       self.WaitUntil(lambda: _VideoEnded(),
                      self.TIMEOUT)