dispatcher: updates go/infra/monitoring/messages to parse some more json formats

go/src/infra/monitoring/messages/alerts.go

 // Copyright 2015 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.
 
 // Package alerts contains structs defined to implement the json format:
 // https://docs.google.com/document/d/10MESGzRy9uAy3Y3-PxUcjiuF3BD3FGGmCNvCjqm3WQQ/preview
 
 package messages
 
 import (
@@ skipping 58 matching lines @@
 }
 
 // Link can be attached to an alert to provide more context to the sheriff.
 type Link struct {
         Title string
         Href  string
 }
 
 // BuildFailure is an Extension.
 type BuildFailure struct {
-        Builders         []Builder
+        TreeCloser       bool
+        Builders         []AlertedBuilder
         Reasons          []Reason
         RegressionRanges []RegressionRange `json:"regression_ranges"`
 }
 
-// Builder represents an individual builder.
-type Builder struct {
+// AlertedBuilder represents an individual builder.
+type AlertedBuilder struct {
         Name          string
         URL           string
         FirstFailure  EpochTime `json:"first_failure"`
         LatestFailure EpochTime `json:"latest_failure"`
 }
 
 // Reason contains information about why the Alert was triggered.
 type Reason struct {
         TestName string
         Step     string
         URL      string
 }
 
 // RegressionRange identifies the bounds of the location of a regression.
 type RegressionRange struct {
         Repo      string
         URL       string
         Revisions []string
 }