Tasks here:

1. Add a dashboard to show failed WfAnalysis, and support query by a date range like the try-job-dashboard.
2. Use ts_mon to capture the number of failed analysis pipelines with a field called 'pipeline' whose value is the name of the pipeline (could be class name).

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/f23ba79ce4fd978bfed2bce8540dbb01f268147a

commit f23ba79ce4fd978bfed2bce8540dbb01f268147a
Author: Chan <chanli@chromium.org>
Date: Wed Mar 15 17:22:55 2017

[Findit] Add ndb model for revert CLs' metadata.

BUG= 700639 ,  700988 

Change-Id: I9b3f7fd173e1d1390de6e876ad2cb947994b6f32
Reviewed-on: https://chromium-review.googlesource.com/454298
Commit-Queue: Chan Li <chanli@chromium.org>
Reviewed-by: Jeffrey Li <lijeffrey@chromium.org>

[add] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/model/revert_cl_status.py
[modify] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/model/test/base_suspected_cl_test.py
[modify] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/waterfall/send_notification_for_culprit_pipeline.py
[modify] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/waterfall/test/send_notification_for_culprit_pipeline_test.py
[delete] https://crrev.com/5446b25c45b7f42243bae8323b34beb19b0040d2/appengine/findit/model/test/wf_culprit_test.py
[modify] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/handlers/test/culprit_test.py
[modify] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/model/wf_suspected_cl.py
[modify] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/model/test/wf_suspected_cl_test.py
[modify] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/handlers/culprit.py
[delete] https://crrev.com/5446b25c45b7f42243bae8323b34beb19b0040d2/appengine/findit/model/wf_culprit.py
[modify] https://crrev.com/f23ba79ce4fd978bfed2bce8540dbb01f268147a/appengine/findit/model/base_suspected_cl.py

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/326fcfe25e27c8e71b32d51bb723ba02fe8d2811

commit 326fcfe25e27c8e71b32d51bb723ba02fe8d2811
Author: Shuotao Gao <stgao@chromium.org>
Date: Thu Mar 16 20:36:48 2017

[Findit] Record aborted analysis.

BUG= 700988 

Change-Id: I6718a81cb1718c5e63ab0596b2c97bf7f4d787a6
Reviewed-on: https://chromium-review.googlesource.com/456644
Reviewed-by: Jeffrey Li <lijeffrey@chromium.org>
Commit-Queue: Shuotao Gao <stgao@chromium.org>

[modify] https://crrev.com/326fcfe25e27c8e71b32d51bb723ba02fe8d2811/appengine/findit/waterfall/analyze_build_failure_pipeline.py
[modify] https://crrev.com/326fcfe25e27c8e71b32d51bb723ba02fe8d2811/appengine/findit/waterfall/test/analyze_build_failure_pipeline_test.py
[modify] https://crrev.com/326fcfe25e27c8e71b32d51bb723ba02fe8d2811/appengine/findit/model/wf_analysis.py
[modify] https://crrev.com/326fcfe25e27c8e71b32d51bb723ba02fe8d2811/appengine/findit/index.yaml

Jeff, we still need a simple dashboard to show the failed analyses.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/dd219a91ac4617267a3ea8a9a8ba18be5ea8f0ec

commit dd219a91ac4617267a3ea8a9a8ba18be5ea8f0ec
Author: Jeffrey Li <lijeffrey@chromium.org>
Date: Mon Mar 20 21:25:49 2017

[Findit] Adding dashboard for aborted analyses

Sample dashboard: http://lijeffrey-dot-findit-for-me.appspot.com/waterfall/pipeline-errors-dashboard

BUG= 700988 

Change-Id: Ifc681949ed11fab2c4cd0f0610f96d3d04f2789f
Reviewed-on: https://chromium-review.googlesource.com/457080
Reviewed-by: Chan Li <chanli@chromium.org>
Reviewed-by: Roberto Carrillo <robertocn@chromium.org>
Commit-Queue: Jeffrey Li <lijeffrey@chromium.org>

[add] https://crrev.com/dd219a91ac4617267a3ea8a9a8ba18be5ea8f0ec/appengine/findit/templates/pipeline_errors_dashboard.html
[modify] https://crrev.com/dd219a91ac4617267a3ea8a9a8ba18be5ea8f0ec/appengine/findit/main.py
[add] https://crrev.com/dd219a91ac4617267a3ea8a9a8ba18be5ea8f0ec/appengine/findit/handlers/pipeline_errors_dashboard.py
[add] https://crrev.com/dd219a91ac4617267a3ea8a9a8ba18be5ea8f0ec/appengine/findit/handlers/test/pipeline_errors_dashboard_test.py