Ignore extra arguments in low_bandwidth_audio_test.

R=phoglund@webrtc.org
TBR=solenberg@webrtc.org

Bug: chromium:755660
Change-Id: I39488f6905875bdc08b006619b972d3f1af2fce1
Reviewed-on: https://webrtc-review.googlesource.com/39924
Reviewed-by: Edward Lemur <ehmaldonado@webrtc.org>
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21641}
diff --git a/audio/test/low_bandwidth_audio_test.py b/audio/test/low_bandwidth_audio_test.py
index 9e25977..aa2bbf3 100755
--- a/audio/test/low_bandwidth_audio_test.py
+++ b/audio/test/low_bandwidth_audio_test.py
@@ -63,6 +63,8 @@
                       type=str, default=None)
   parser.add_argument('--isolated-script-test-perf-output',
                       type=str, default=None)
+  parser.add_argument('--test-launcher-summary-output',
+                      type=str, default=None)
   args = parser.parse_args()
 
   return args