sandwich: Fixes some failures in request_track.py

tools/android/loading/request_track_unittest.py

Index: tools/android/loading/request_track_unittest.py
diff --git a/tools/android/loading/request_track_unittest.py b/tools/android/loading/request_track_unittest.py
index 64d3e77f1b0e1fea100190148588f5ea8b817244..3f0baeace033c23d125df2bd9f4e78514edcbcb0 100644
--- a/tools/android/loading/request_track_unittest.py
+++ b/tools/android/loading/request_track_unittest.py
@@ -492,6 +492,17 @@ class RequestTrackTestCase(unittest.TestCase):
     with self.assertRaises(AssertionError):
       self.request_track.Handle('Network.requestWillBeSent', msg)
 
+  def testIgnoreCompletedDuplicates(self):
+    self.request_track.Handle('Network.requestWillBeSent',
+                              RequestTrackTestCase._REQUEST_WILL_BE_SENT)
+    self.request_track.Handle('Network.responseReceived',
+                              RequestTrackTestCase._RESPONSE_RECEIVED)
+    self.request_track.Handle('Network.loadingFinished',
+                              RequestTrackTestCase._LOADING_FINISHED)
+    # Should not raise an AssertionError.
+    self.request_track.Handle('Network.requestWillBeSent',
+                              RequestTrackTestCase._REQUEST_WILL_BE_SENT)
+
   def testSequenceOfGeneratedResponse(self):
     self.request_track.Handle('Network.requestServedFromCache',
                               RequestTrackTestCase._SERVED_FROM_CACHE)