Interpret collected iOS Swarming task results

scripts/slave/recipe_modules/ios/example.expected/infra_failure.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.fake",
       "--builder",
       "ios",
@@ skipping 496 matching lines @@
       "--json",
       "{\"base_task_name\": \"fake test (fake device iOS 8.1)/Mac/fake-hash-/ios/0\", \"tasks\": {\"fake test (fake device iOS 8.1)/Mac/fake-hash-/ios/0\": {\"shard_index\": 0, \"task_id\": \"10000\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"}}}",
       "--task-summary-json",
       "/path/to/tmp/json",
       "--task-output-dir",
       "[TMP_BASE]/0_tmp_2"
     ],
     "name": "fake test (fake device iOS 8.1) on Mac",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",
-      "@@@STEP_TEXT@swarming pending 71s@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"shards\": [@@@",
       "@@@STEP_LOG_LINE@json.output@    {@@@",
-      "@@@STEP_LOG_LINE@json.output@      \"abandoned_ts\": null, @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"bot_id\": \"vm30\", @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"completed_ts\": \"2014-09-25T01:42:00.123\", @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"created_ts\": \"2014-09-25T01:41:00.123\", @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"durations\": [@@@",
-      "@@@STEP_LOG_LINE@json.output@        5.7, @@@",
-      "@@@STEP_LOG_LINE@json.output@        31.5@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"exit_codes\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@        2@@@",
       "@@@STEP_LOG_LINE@json.output@      ], @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"exit_codes\": [@@@",
-      "@@@STEP_LOG_LINE@json.output@        0, @@@",
-      "@@@STEP_LOG_LINE@json.output@        0@@@",
-      "@@@STEP_LOG_LINE@json.output@      ], @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"failure\": false, @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"id\": \"148aa78d7aa0000\", @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"internal_failure\": false, @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"isolated_out\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@        \"isolated\": \"abc123\", @@@",
-      "@@@STEP_LOG_LINE@json.output@        \"isolatedserver\": \"https://isolateserver.appspot.com\", @@@",
-      "@@@STEP_LOG_LINE@json.output@        \"namespace\": \"default-gzip\", @@@",
-      "@@@STEP_LOG_LINE@json.output@        \"view_url\": \"blah\"@@@",
-      "@@@STEP_LOG_LINE@json.output@      }, @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"modified_ts\": \"2014-09-25 01:42:00\", @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"name\": \"heartbeat-canary-2014-09-25_01:41:55-os=Windows\", @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"outputs\": [@@@",
-      "@@@STEP_LOG_LINE@json.output@        \"Heart beat succeeded on win32.\\n\", @@@",
-      "@@@STEP_LOG_LINE@json.output@        \"Foo\"@@@",
-      "@@@STEP_LOG_LINE@json.output@      ], @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"started_ts\": \"2014-09-25T01:42:11.123\", @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"state\": 112, @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"try_number\": 1, @@@",
-      "@@@STEP_LOG_LINE@json.output@      \"user\": \"unknown\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"state\": 112@@@",
       "@@@STEP_LOG_LINE@json.output@    }@@@",
       "@@@STEP_LOG_LINE@json.output@  ]@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
       "@@@STEP_LINK@shard #0@https://chromium-swarm.appspot.com/user/task/10000@@@",
-      "@@@STEP_FAILURE@@@"
+      "@@@STEP_EXCEPTION@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "Failed fake test (fake device iOS 8.1).",
     "recipe_result": null,
     "status_code": 1
   }
 ]