[infra] Add pubsub emulator to gcloud asset

Bug: skia:
Change-Id: I41d45b2577104d5a172cf06e5241c4a33e6d8e19
Reviewed-on: https://skia-review.googlesource.com/154181
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Stephan Altmueller <stephana@google.com>
2 files changed