The base CL landed as https://chromium-review.googlesource.com/c/infra/infra/+/648006

Next step is to improve the async pipeline in the context of pubsub notifications from Swarming and Buildbucket.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/e526efd493e6d4174928978d97398dfcc6984927

commit e526efd493e6d4174928978d97398dfcc6984927
Author: Shuotao Gao <stgao@chromium.org>
Date: Tue Sep 19 00:16:12 2017

[Findit] Add mocking functions for new base pipelines.

Bug:  764496 
Change-Id: I79404c1bce98b5ae9a872c6a6578e012a3b82380
Reviewed-on: https://chromium-review.googlesource.com/671538
Commit-Queue: Shuotao Gao <stgao@chromium.org>
Reviewed-by: Roberto Carrillo <robertocn@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>

[modify] https://crrev.com/e526efd493e6d4174928978d97398dfcc6984927/appengine/findit/libs/structured_object.py
[modify] https://crrev.com/e526efd493e6d4174928978d97398dfcc6984927/appengine/findit/gae_libs/testcase.py
[modify] https://crrev.com/e526efd493e6d4174928978d97398dfcc6984927/appengine/findit/gae_libs/pipeline_wrapper.py
[modify] https://crrev.com/e526efd493e6d4174928978d97398dfcc6984927/appengine/findit/gae_libs/pipelines.py
[modify] https://crrev.com/e526efd493e6d4174928978d97398dfcc6984927/appengine/findit/libs/test/structured_object_test.py

Remaining work is being handled in  bug 811632