[Findit] Adding improved error detection to MonitorTryJobPipeline

appengine/findit/common/waterfall/try_job_error.py

Index: appengine/findit/common/waterfall/try_job_error.py
diff --git a/appengine/findit/common/waterfall/try_job_error.py b/appengine/findit/common/waterfall/try_job_error.py
new file mode 100644
index 0000000000000000000000000000000000000000..1ba8b19dd5a13c976c65f8fdc263e1e608863431
--- /dev/null
+++ b/appengine/findit/common/waterfall/try_job_error.py
@@ -0,0 +1,18 @@
+# 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.
+
+"""Represents possible error codes for what can go wrong during try jobs."""
+
+# An error was detected but the root cause unknown. Cases resulting in this
+# should be investigated individually and common root causes added to this
+# module as dedicated error codes.
+UNKNOWN = 10
+# The try job did not finish within the required time and was abandoned.
+TIMEOUT = 20
+# An error was returned directly when making a request buildbucket.
+BUILDBUCKET_REQUEST_ERROR = 30
+# Buildbucket ran the try job and reported an error.
+CI_REPORTED_ERROR = 40
+# An infra failure occurred according to the recipe report.
+INFRA_FAILURE = 50