Fix result parsing for gradle benchmarks

Change-Id: I014b4b7bfe91c1273fd4e9c08bf287c8d020ddbc
diff --git a/tools/test_gradle_benchmarks.py b/tools/test_gradle_benchmarks.py
index 8d9182c..0c976a3 100755
--- a/tools/test_gradle_benchmarks.py
+++ b/tools/test_gradle_benchmarks.py
@@ -18,7 +18,7 @@
     description='Run D8 or DX on gradle apps located in'
                 ' third_party/benchmarks/.'
                 ' Report Golem-compatible RunTimeRaw values.')
-  result.add_option('--skip_download',
+  parser.add_argument('--skip_download',
                     help='Don\'t automatically pull down dependencies.',
                     default=False, action='store_true')
   parser.add_argument('--tool',