Add retry functionality to WebRTC integration tests.

BUG=None
TEST=None

Change-Id: Ibc6d337f9baaf95eed9c61b65a054b76b9260016
Previous-Reviewed-on: https://gerrit.chromium.org/gerrit/45731
(cherry picked from commit ef731cd110713cae7c390bf8a757cbb44a2166ab)
Reviewed-on: https://gerrit.chromium.org/gerrit/46406
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Tested-by: Scott Zawalski <scottz@chromium.org>
diff --git a/client/site_tests/desktopui_WebRTC/control b/client/site_tests/desktopui_WebRTC/control
index 02c4024..fb7be3d 100644
--- a/client/site_tests/desktopui_WebRTC/control
+++ b/client/site_tests/desktopui_WebRTC/control
@@ -10,6 +10,7 @@
 TEST_TYPE = "client"
 SUITE = "regression"
 DEPENDENCIES = "webcam"
+RETRIES=5
 
 DOC = """
 Run the pyauto WebRTC test suite.