[Findit] Adding metadata for manually vs automatically triggered flake analyses

appengine/findit/waterfall/flake/trigger_flake_analyses_pipeline.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import logging
 
-from common import constants
 from common import time_util
 from common.pipeline_wrapper import BasePipeline
 from model.flake. flake_analysis_request import FlakeAnalysisRequest
 from model.wf_analysis import WfAnalysis
 from model.wf_swarming_task import WfSwarmingTask
 from waterfall.flake import flake_analysis_service
+from waterfall.flake import triggering_sources
 
 
 class TriggerFlakeAnalysesPipeline(BasePipeline):
   """A pipeline that automatically triggers flake analyses."""
 
   # Arguments number differs from overridden method - pylint: disable=W0221
   def run(self, master_name, builder_name, build_number):
     """Triggers flake analyses for flaky tests found by build failure analysis.
 
     Args:
@@ skipping 24 matching lines @@
       # within reasonable limits. For experimentation with automatic flakiness
       # checking, only run 1 test per anaysis to avoid excessive load on the
       # swarming server in case there are too many flaky tests per analysis for
       # now.
       test_name = flaky_tests[0]
       request = FlakeAnalysisRequest.Create(test_name, False, None)
       request.AddBuildStep(
           master_name, builder_name, build_number, step,
           time_util.GetUTCNow())
       scheduled = flake_analysis_service.ScheduleAnalysisForFlake(
-          request, 'findit-for-me@appspot.gserviceaccount.com', False)
+          request, 'findit-for-me@appspot.gserviceaccount.com', False,
+          triggering_sources.FINDIT_PIPELINE)
 
       if scheduled:  # pragma: no branch
         logging.info('%s/%s/%s has %s flaky tests.',
                      master_name, builder_name, build_number, len(flaky_tests))
         logging.info('A flake analysis has been triggered for %s', test_name)