[chromeos] Make testProfilePreservedBetweenLogins test robust

chrome/test/functional/chromeos_login.py

Index: chrome/test/functional/chromeos_login.py
diff --git a/chrome/test/functional/chromeos_login.py b/chrome/test/functional/chromeos_login.py
index db4995184094e5bacc9e09f266601a97d4221173..cfe0dbfe9f5dcfb938bc498431cf2f810be116d4 100755
--- a/chrome/test/functional/chromeos_login.py
+++ b/chrome/test/functional/chromeos_login.py
@@ -206,7 +206,12 @@ class ChromeosLogin(pyauto.PyUITest):
 
     # Build up some history and setup state in "Local State".
     url = self.GetHttpURLForDataPath('title2.html')
-    self.NavigateToURL(url)
+    def _NavigateAndRecord():
+      self.NavigateToURL(url)

[craigdh, 2012/08/17 00:29:49]

Do you need to navigate every time you try this? Or can you navigate once and
then just wait for the navigation to register?

[Nirnimesh, 2012/08/17 00:39:19]

Done.

+      return len(self.GetHistoryInfo().History())
+    # chromeos often takes a while to register URLs into history.
+    self.assertTrue(self.WaitUntil(_NavigateAndRecord),
+                    msg='Could not open %s successfully' % url)
     open('/home/chronos/__magic__', 'w').close()
     open('/home/chronos/user/__magic__', 'w').close()