[Findit] Add three sub-pipelines to analyze build failure.

appengine/findit/model/build_analysis.py

Index: appengine/findit/model/build_analysis.py
diff --git a/appengine/findit/model/build_analysis.py b/appengine/findit/model/build_analysis.py
index 78dba6bfa7c6402d45961d6f71eabf62eb90d811..eed6c8eaecea7863a5085b5f56e96014e7436cd5 100644
--- a/appengine/findit/model/build_analysis.py
+++ b/appengine/findit/model/build_analysis.py
@@ -39,7 +39,7 @@ class BuildAnalysis(BaseBuildModel):
     return self.status == BuildAnalysisStatus.ERROR
 
   def Reset(self):  # pragma: no cover
-    """Reset to the state as if no analysis is run."""
+    """Resets to the state as if no analysis is run."""
     self.pipeline_url = None
     self.status = BuildAnalysisStatus.PENDING
     self.start_time = None
@@ -53,3 +53,6 @@ class BuildAnalysis(BaseBuildModel):
       default=BuildAnalysisStatus.PENDING, indexed=False)
   start_time = ndb.DateTimeProperty(indexed=False)
   updated_time = ndb.DateTimeProperty(indexed=False, auto_now=True)
+
+  # Analysis result.
+  result = ndb.JsonProperty(indexed=False, compressed=True)