Add support for --proxy_port.

autoupdate_unittest.py

Index: autoupdate_unittest.py
diff --git a/autoupdate_unittest.py b/autoupdate_unittest.py
index 029f1c9302e380661a33fd86ec167e0a781758eb..c1bfcee2a970f42f9fb9dcda5b7de43a673dc055 100755
--- a/autoupdate_unittest.py
+++ b/autoupdate_unittest.py
@@ -124,6 +124,19 @@ class AutoupdateTest(mox.MoxTestBase):
     self.assertEqual(au_mock.HandleUpdatePing(test_data), self.payload)
     self.mox.VerifyAll()
 
+  def testChangeUrlPort(self):
+    r = autoupdate._ChangeUrlPort('http://fuzzy:8080/static', 8085)
+    self.assertEqual(r, 'http://fuzzy:8085/static')
+
+    r = autoupdate._ChangeUrlPort('http://fuzzy/static', 8085)
+    self.assertEqual(r, 'http://fuzzy:8085/static')
+
+    r = autoupdate._ChangeUrlPort('ftp://fuzzy/static', 8085)
+    self.assertEqual(r, 'ftp://fuzzy:8085/static')
+
+    r = autoupdate._ChangeUrlPort('ftp://fuzzy', 8085)
+    self.assertEqual(r, 'ftp://fuzzy:8085')
+
 
 if __name__ == '__main__':
   unittest.main()