Blink/Layout Tests/Scripts - applied the additional driver flags to t…

…he check-sys-deps run as well.

When you must disable the sandbox, you want to disable it for any
content_shell run, including check-sys-deps runs, instead of using
--nocheck-sys-deps.

Bug: None
Change-Id: I90be01ad4034e5c93335ca55430ba550c389380d
Reviewed-on: https://chromium-review.googlesource.com/964741
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543658}

AUTHORS

@@ -646,6 +646,7 @@ Philipp Hancke <fippo@andyet.net>
 Philipp Hancke <philipp.hancke@googlemail.com>
 Philippe Beauchamp <philippe.beauchamp@gmail.com>
 Philippe Beaudoin <philippe.beaudoin@gmail.com>
+PhistucK <phistuck@gmail.com>
 Pierre Neter <pierreneter@gmail.com>
 Pierre-Antoine LaFayette <pierre.lafayette@gmail.com>
 Po-Chun Chang <pochang0403@gmail.com>

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base.py

@@ -428,6 +428,10 @@ def check_sys_deps(self, needs_http):
         """
         cmd = [self._path_to_driver(), '--check-layout-test-sys-deps']
 
+        additional_flags = self.get_option('additional_driver_flag', [])
+        if additional_flags:
+            cmd.append(additional_flags[0])
+
         local_error = ScriptError()
 
         def error_handler(script_error):