The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build/+/562b4469a95198f148e15b4b038458e3c0f3b25f

commit 562b4469a95198f148e15b4b038458e3c0f3b25f
Author: Edward Lemur <ehmaldonado@chromium.org>
Date: Thu Jul 27 10:00:00 2017

Run calculate_targets in checkout.

It fails when executed on LUCI emulation mode with:
gn.py: Could not find checkout in any parent of the current path.
This must be run inside a checkout.

See for example: https://build.chromium.org/p/tryserver.webrtc/builders/linux_libfuzzer_rel/builds/14520/steps/calculate%20targets/logs/stdio

Bug:  chromium:749456 
Change-Id: Ia8fdf3d33e25736528d27bd02b3331256bd46dab
Reviewed-on: https://chromium-review.googlesource.com/589127
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

[modify] https://crrev.com/562b4469a95198f148e15b4b038458e3c0f3b25f/scripts/slave/README.recipes.md
[modify] https://crrev.com/562b4469a95198f148e15b4b038458e3c0f3b25f/scripts/slave/recipes/webrtc/libfuzzer.expected/full_client_webrtc_Linux64_Release__Libfuzzer_.json
[modify] https://crrev.com/562b4469a95198f148e15b4b038458e3c0f3b25f/scripts/slave/recipes/webrtc/libfuzzer.expected/full_tryserver_webrtc_linux_libfuzzer_rel.json
[modify] https://crrev.com/562b4469a95198f148e15b4b038458e3c0f3b25f/scripts/slave/recipes/webrtc/libfuzzer.py