Implement generate_test_launcher_retry_limit_args for Telemetry unittest script

Bug: 894261
Change-Id: I6d161b6e1c7b7cbfe039fc15747f71acb3042f70
Reviewed-on: https://chromium-review.googlesource.com/c/1281170Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#599962}

testing/scripts/common.py

@@ -231,7 +231,7 @@ class BaseIsolatedScriptArgsAdapter(object):
         '--isolated-script-test-repeat', type=str,
         required=False)
     self._parser.add_argument(
-        '--isolated-script-test-launcher-retry-limit', type=str,
+        '--isolated-script-test-launcher-retry-limit', type=int,
         required=False)
     self._parser.add_argument(
         '--isolated-script-test-also-run-disabled-tests',

testing/scripts/run_telemetry_as_googletest.py

@@ -48,6 +48,9 @@ class TelemetryUnittestAdapter(common.BaseIsolatedScriptArgsAdapter):
     return ['--total-shards=%d' % total_shards,
             '--shard-index=%d' % shard_index]
 
+  def generate_test_launcher_retry_limit_args(self, retry_limit):
+    return ['--retry-limit=%d' % retry_limit]
+
 
 def main():
   adapter = TelemetryUnittestAdapter()