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Nodir says we need to just add *args, **kwargs to CorsHandler.options:
https://chromium.googlesource.com/infra/luci/luci-py/+/0355ec5caef0132e1052e3fd4ec90845290488a9/appengine/components/components/endpoints_webapp2/adapter.py#100

I tried this and it seems to allow try jobs to be scheduled again.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/luci/luci-py.git/+/e0a8a5640c4104e5c90781d833168aa8a8d1f24d

commit e0a8a5640c4104e5c90781d833168aa8a8d1f24d
Author: smut <smut@google.com>
Date: Fri Jun 01 23:42:56 2018

[webapp2 adapter] Fix method signature for CorsHandler.options

Bug:  848950 
Change-Id: Ibed95782ce70646276005ee959af0fa4c8aa191f
Reviewed-on: https://chromium-review.googlesource.com/1083840
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: smut <smut@google.com>

[modify] https://crrev.com/e0a8a5640c4104e5c90781d833168aa8a8d1f24d/appengine/components/components/endpoints_webapp2/adapter.py

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/2deea1aa314694a7f128582b5a6355c3b75ba7de

commit 2deea1aa314694a7f128582b5a6355c3b75ba7de
Author: smut <smut@google.com>
Date: Sat Jun 02 00:07:39 2018

Roll luci-py to e0a8a5640c4104e5c90781d833168aa8a8d1f24d

Changes:
e0a8a564 [webapp2 adapter] Fix method signature for CorsHandler.options
0355ec5c [Swarming] Update clients to hit /_ah/api instead of /api

Bug:  848950 
Change-Id: Ib14c5aac48b21144c1cc5d92dc535b8bb3dada52
Reviewed-on: https://chromium-review.googlesource.com/1083846
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: smut <smut@google.com>

[modify] https://crrev.com/2deea1aa314694a7f128582b5a6355c3b75ba7de/DEPS