Scheduler: Add routing header to method metadata (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/scheduler/synth.py. synthtool > Ensuring dependencies. synthtool > Pulling artman image. latest: Pulling from googleapis/artman Digest: sha256:e3c054a2fb85a12481c722af616c7fb6f1d02d862248385eecbec3e4240ebd1e Status: Image is up to date for googleapis/artman:latest synthtool > Cloning googleapis. synthtool > Running generator for google/cloud/scheduler/artman_cloudscheduler_v1beta1.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/cloudscheduler-v1beta1. synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/scheduler/v1beta1/job.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/cloudscheduler-v1beta1/google/cloud/scheduler_v1beta1/proto/job.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/scheduler/v1beta1/cloudscheduler.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/cloudscheduler-v1beta1/google/cloud/scheduler_v1beta1/proto/cloudscheduler.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/scheduler/v1beta1/target.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/cloudscheduler-v1beta1/google/cloud/scheduler_v1beta1/proto/target.proto synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/cloudscheduler-v1beta1/google/cloud/scheduler_v1beta1/proto. synthtool > Replaced 'google-cloud-cloudscheduler' in google/cloud/scheduler_v1beta1/gapic/cloud_scheduler_client.py. .coveragerc .flake8 MANIFEST.in noxfile.py.j2 setup.cfg Running session blacken Creating virtualenv using python3.6 in /tmpfs/src/git/autosynth/working_repo/scheduler/.nox/blacken pip install --upgrade black black google tests docs reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/gapic/enums.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/gapic/cloud_scheduler_client_config.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/gapic/transports/cloud_scheduler_grpc_transport.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/proto/cloudscheduler_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/proto/job_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/proto/cloudscheduler_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/proto/target_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/types.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/gapic/cloud_scheduler_client.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/proto/job_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/google/cloud/scheduler_v1beta1/proto/target_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/scheduler/tests/unit/gapic/v1beta1/test_cloud_scheduler_client_v1beta1.py All done! ✨ 🍰 ✨ 16 files reformatted, 4 files left unchanged. Session blacken was successful. synthtool > Cleaned up 2 temporary directories. synthtool > Wrote metadata to synth.metadata.