[task scheduler] Specs helpers for gen_tasks.go changes
[task scheduler] Specs helpers for gen_tasks.go changes

BUG=skia:6070

Change-Id: Iff62bf916d3ecd68358c651021cf1acc1fbc940e
Reviewed-on: https://skia-review.googlesource.com/7884
Reviewed-by: Ben Wagner <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot