Run config upgrade tool on Linux

This updates the Python script to run the upgrade tool each time it is
started.

Bug: 954427
Change-Id: If4fc566698ecc443ef06840385c90ff0be43808f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1629489Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664317}

remoting/host/linux/linux_me2me_host.py

@@ -1419,6 +1419,9 @@ Web Store: https://chrome.google.com/remotedesktop"""
   parser.add_argument("--watch-resolution", dest="watch_resolution",
                       type=int, nargs=2, default=False, action="store",
                       help=argparse.SUPPRESS)
+  parser.add_argument("--skip-config-upgrade", dest="skip_config_upgrade",
+                      default=False, action="store_true",
+                      help="Skip running the config upgrade tool.")
   parser.add_argument(dest="args", nargs="*", help=argparse.SUPPRESS)
   options = parser.parse_args()
 
@@ -1585,6 +1588,15 @@ Web Store: https://chrome.google.com/remotedesktop"""
   # Register an exit handler to clean up session process and the PID file.
   atexit.register(cleanup)
 
+  # Run the config upgrade tool, to update the refresh token if needed.
+  # TODO(lambroslambrou): Respect CHROME_REMOTE_DESKTOP_HOST_EXTRA_PARAMS
+  # and the GOOGLE_CLIENT... variables, and fix the tool to work in a
+  # test environment.
+  if not options.skip_config_upgrade:
+    args = [HOST_BINARY_PATH, "--upgrade-token",
+            "--host-config=%s" % config_file]
+    subprocess.check_call(args);
+
   # Load the initial host configuration.
   host_config = Config(config_file)
   try: