Only parse known args for monochrome_apk_checker

monochrome_apk_checker.py gets called from bots and sometimes extra
arguments are passed in that are not relevant for this script. This cl
just changes the parser behaviour to ignore unknown arguments.

Bug: 1084351
Change-Id: I9b574bd6ae8f16e3c097baa7b50811557a2e773b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209115Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Auto-Submit: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772286}

chrome/android/monochrome/scripts/monochrome_apk_checker.py

@@ -245,7 +245,11 @@ def ParseArgs(args):
   parser.add_argument(
       '--system-webview-pathmap',
       help='The system webview APK resources pathmap path.')
-  return parser.parse_args(args)
+
+  # This script is called from test bots that sometimes would add extra unneeded
+  # arguments. Just ignore unknown ones. crbug.com/1084351
+  parsed, _ = parser.parse_known_args(args)
+  return parsed
 
 
 def main():