GitLab

iOS swarming arguments doesn't contain isolate args, which are separated
by '--' from the swarming trigger arguments.  Remove the '--' assert in
the script which blocks iOS tasks to use the custom swarming trigger logic.
Other platforms:
<args to swarming.py trigger> -- <args to bot running isolate>

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I49bb5a1c0abf78a5aa775d139f9dc60c60adeb09
Reviewed-on: https://chromium-review.googlesource.com/953251Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Menglu Huang <huangml@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541631}