Apply gerrit ref if it is a Gerrit patch

infra/bots/recipes/swarm_trigger.expected/recipe_with_gerrit_patch.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport json\nimport sys\n\nwith open(sys.argv[1]) as f:\n  content = json.load(f)\n\nprint json.dumps(content, indent=2)\n",
-      "{\"buildername\": \"Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug\", \"buildnumber\": 5, \"mastername\": \"client.skia\", \"path_config\": \"kitchen\", \"recipe\": \"swarm_trigger\", \"revision\": \"abc123\", \"slavename\": \"skiabot-linux-swarm-000\"}"
+      "{\"buildername\": \"Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot\", \"buildnumber\": 5, \"event.change.number\": \"2100\", \"event.patchSet.ref\": \"refs/changes/00/2100/2\", \"mastername\": \"client.skia\", \"patch_storage\": \"gerrit\", \"path_config\": \"kitchen\", \"recipe\": \"swarm_trigger\", \"repository\": \"skia\", \"revision\": \"abc123\", \"slavename\": \"skiabot-linux-swarm-000\"}"
     ],
     "name": "print properties",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import json@@@",
       "@@@STEP_LOG_LINE@python.inline@import sys@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@with open(sys.argv[1]) as f:@@@",
       "@@@STEP_LOG_LINE@python.inline@  content = json.load(f)@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
@@ skipping 302 matching lines @@
       "trigger",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--isolate-server",
       "https://isolateserver.appspot.com",
       "--priority",
       "90",
       "--shards",
       "1",
       "--task-name",
-      "compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5",
+      "compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5",
       "--dump-json",
       "/path/to/tmp/json",
       "--expiration",
       "72000",
       "--io-timeout",
       "2400",
       "--hard-timeout",
       "14400",
       "--dimension",
       "gpu",
       "none",
       "--dimension",
       "os",
       "Ubuntu",
       "--dimension",
       "pool",
       "Skia",
       "--tag",
       "allow_milo:1",
       "--tag",
-      "buildername:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug",
+      "buildername:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot",
       "--tag",
       "buildnumber:5",
       "--tag",
       "data:[dummy hash for compile_skia]",
       "--tag",
       "master:client.skia",
       "--tag",
       "name:compile_skia",
       "--tag",
       "os:Ubuntu",
       "--tag",
       "revision:abc123",
       "--tag",
       "slavename:skiabot-linux-swarm-000",
       "--tag",
       "stepname:compile_skia on Ubuntu",
       "--idempotent",
       "[dummy hash for compile_skia]",
       "--",
       "--workdir",
       "../../..",
       "swarm_compile",
-      "buildername=Build-Ubuntu-GCC-x86_64-Debug",
+      "event.change.number=2100",
+      "repository=skia",
+      "buildername=Build-Ubuntu-GCC-x86_64-Debug-Trybot",
       "mastername=client.skia.compile",
+      "patch_storage=gerrit",
       "buildnumber=1",
       "slavename=skiabot-dummy-compile-slave",
       "reason=Triggered by Skia swarm_trigger Recipe",
       "swarm_out_dir=${ISOLATED_OUTDIR}",
+      "event.patchSet.ref=refs/changes/00/2100/2",
       "revision=abc123"
     ],
     "name": "[trigger] compile_skia on Ubuntu",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"tasks\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@    \"compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"shard_index\": 0, @@@",
       "@@@STEP_LOG_LINE@json.output@      \"task_id\": \"10000\", @@@",
       "@@@STEP_LOG_LINE@json.output@      \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"@@@",
       "@@@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_LINK@view steps on Milo@https://luci-milo.appspot.com/swarming/task/10000@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/swarming.client/swarming.py",
       "collect",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--json",
-      "{\"base_task_name\": \"compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5\", \"tasks\": {\"compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5\": {\"shard_index\": 0, \"task_id\": \"10000\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"}}}",
+      "{\"base_task_name\": \"compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5\", \"tasks\": {\"compile_skia/Ubuntu/[dummy has/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5\": {\"shard_index\": 0, \"task_id\": \"10000\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"}}}",
       "--task-summary-json",
       "/path/to/tmp/json"
     ],
     "name": "compile_skia on Ubuntu",
     "~followup_annotations": [
       "@@@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, @@@",
@@ skipping 165 matching lines @@
       "trigger",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--isolate-server",
       "https://isolateserver.appspot.com",
       "--priority",
       "90",
       "--shards",
       "1",
       "--task-name",
-      "test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5",
+      "test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5",
       "--dump-json",
       "/path/to/tmp/json",
       "--expiration",
       "72000",
       "--io-timeout",
       "2400",
       "--hard-timeout",
       "14400",
       "--dimension",
       "cpu",
       "x86-64-avx2",
       "--dimension",
       "gpu",
       "none",
       "--dimension",
       "os",
       "Ubuntu",
       "--dimension",
       "pool",
       "Skia",
       "--tag",
       "allow_milo:1",
       "--tag",
-      "buildername:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug",
+      "buildername:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot",
       "--tag",
       "buildnumber:5",
       "--tag",
       "data:def456",
       "--tag",
       "master:client.skia",
       "--tag",
       "name:test_skia",
       "--tag",
       "os:Ubuntu",
       "--tag",
       "revision:abc123",
       "--tag",
       "slavename:skiabot-linux-swarm-000",
       "--tag",
       "stepname:test_skia on Ubuntu",
       "--cipd-package",
       "skp:skia/bots/skp:version:0",
       "--cipd-package",
       "skimage:skia/bots/skimage:version:0",
       "--cipd-package",
       "svg:skia/bots/svg:version:0",
       "def456",
       "--",
       "--workdir",
       "../../..",
       "swarm_test",
-      "buildername=Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug",
+      "event.change.number=2100",
+      "repository=skia",
+      "buildername=Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot",
       "mastername=client.skia",
+      "patch_storage=gerrit",
       "buildnumber=5",
       "slavename=skiabot-linux-swarm-000",
       "reason=Triggered by Skia swarm_trigger Recipe",
       "swarm_out_dir=${ISOLATED_OUTDIR}",
+      "event.patchSet.ref=refs/changes/00/2100/2",
       "revision=abc123"
     ],
     "name": "[trigger] test_skia on Ubuntu",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"tasks\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@    \"test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"shard_index\": 0, @@@",
       "@@@STEP_LOG_LINE@json.output@      \"task_id\": \"10000\", @@@",
       "@@@STEP_LOG_LINE@json.output@      \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"@@@",
       "@@@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_LINK@view steps on Milo@https://luci-milo.appspot.com/swarming/task/10000@@@"
     ]
@@ skipping 24 matching lines @@
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/swarming.client/swarming.py",
       "collect",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--json",
-      "{\"base_task_name\": \"test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5\", \"tasks\": {\"test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug/5\": {\"shard_index\": 0, \"task_id\": \"10000\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"}}}",
+      "{\"base_task_name\": \"test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5\", \"tasks\": {\"test_skia/Ubuntu/def456/Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot/5\": {\"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",
       "[SLAVE_BUILD]/swarming_temp_dir/outputs/test_skia"
     ],
     "name": "test_skia on Ubuntu",
     "~followup_annotations": [
       "@@@STEP_TEXT@swarming pending 71s@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"shards\": [@@@",
@@ skipping 70 matching lines @@
     ],
     "name": "dm_dir"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[skia::core]/resources/upload_dm_results.py",
       "[SLAVE_BUILD]/dm",
       "abc123",
-      "Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug",
+      "Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Debug-Trybot",
       "5",
-      "",
+      "2100",
       "[SLAVE_BUILD]/skia/common/py/utils"
     ],
     "cwd": "[SLAVE_BUILD]/skia",
     "env": {
       "AWS_CREDENTIAL_FILE": "[HOME]/chromium-skia-gm.boto",
       "BOTO_CONFIG": "[HOME]/chromium-skia-gm.boto"
     },
     "name": "Upload DM Results"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]