Milo buildbot: Add in the rest of the blame/commits information.

milo/appengine/buildbucket/expectations/master.tryserver.infra/InfraPresubmit.json

 {
   "Name": "InfraPresubmit",
   "Warning": "",
   "CurrentBuilds": [
     {
       "Link": {
         "Label": "2862",
         "URL": "https://build.chromium.org/p/tryserver.infra/builders/Infra%20Presubmit/builds/2862"
       },
       "Status": "Running",
       "PendingTime": {
         "Started": "2016-06-30T23:03:52.84472Z",
         "Finished": "2016-06-30T23:05:10.54916Z",
         "Duration": 77704440000
       },
       "ExecutionTime": {
         "Started": "2016-06-30T23:05:10.54916Z",
         "Finished": "0001-01-01T00:00:00Z",
         "Duration": -9374632844720000
       },
       "Revision": "HEAD",
       "Text": [
         "buildbucket id 9008388967818877792"
       ],
       "Blame": [
         {
           "AuthorName": "",
           "AuthorEmail": "recipe-roller@chromium.org",
+          "CommitTime": "0001-01-01T00:00:00Z",
           "Repo": "",
           "Branch": "",
-          "RequestRevision": "HEAD",
-          "Revision": "",
+          "RequestRevision": {
+            "Label": "HEAD",
+            "URL": ""
+          },
+          "Revision": {

[nodir, 2017/04/19 18:37:48]

this does not look right. Shouldn't this be nil?

also I think all these fields used in expectation files should be marked
omitempty

[hinoka, 2017/04/20 22:09:43]

Done.

+            "Label": "",
+            "URL": ""
+          },
           "Description": "",
           "Title": "",
           "Changelist": {
             "Label": "Rietveld CL 2112113002",
             "URL": "https://codereview.chromium.org/2112113002/#ps1"
           },
           "CommitURL": "",
           "File": null
         }
       ],
@@ skipping 18 matching lines @@
         "Duration": 0
       },
       "Revision": "HEAD",
       "Text": [
         "buildbucket id 9008387727896135840"
       ],
       "Blame": [
         {
           "AuthorName": "",
           "AuthorEmail": "recipe-roller@chromium.org",
+          "CommitTime": "0001-01-01T00:00:00Z",
           "Repo": "",
           "Branch": "",
-          "RequestRevision": "HEAD",
-          "Revision": "",
+          "RequestRevision": {
+            "Label": "HEAD",
+            "URL": ""
+          },
+          "Revision": {
+            "Label": "",
+            "URL": ""
+          },
           "Description": "",
           "Title": "",
           "Changelist": {
             "Label": "Rietveld CL 2114743004",
             "URL": "https://codereview.chromium.org/2114743004/#ps1"
           },
           "CommitURL": "",
           "File": null
         }
       ],
       "Build": null
     }
   ],
   "FinishedBuilds": null,
   "MachinePool": null
 }