Apply gerrit ref if it is a Gerrit patch

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

 [
   {
     "cmd": [
       "python",
       "-u",
+      "\nimport sys, os\npath = sys.argv[1]\nmode = int(sys.argv[2])\nif not os.path.isdir(path):\n  if os.path.exists(path):\n    print \"%s exists but is not a dir\" % path\n    sys.exit(1)\n  os.makedirs(path, mode)\n",
+      "[SLAVE_BUILD]/tmp",
+      "511"
+    ],
+    "name": "makedirs tmp_dir",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@python.inline@@@@",
+      "@@@STEP_LOG_LINE@python.inline@import sys, os@@@",
+      "@@@STEP_LOG_LINE@python.inline@path = sys.argv[1]@@@",
+      "@@@STEP_LOG_LINE@python.inline@mode = int(sys.argv[2])@@@",
+      "@@@STEP_LOG_LINE@python.inline@if not os.path.isdir(path):@@@",
+      "@@@STEP_LOG_LINE@python.inline@  if os.path.exists(path):@@@",
+      "@@@STEP_LOG_LINE@python.inline@    print \"%s exists but is not a dir\" % path@@@",
+      "@@@STEP_LOG_LINE@python.inline@    sys.exit(1)@@@",
+      "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
+      "@@@STEP_LOG_END@python.inline@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[SLAVE_BUILD]/skia/infra/bots/assets/skp/VERSION",
       "/path/to/tmp/"
     ],
     "name": "Get downloaded SKP VERSION"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 84 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@    print \"%s exists but is not a dir\" % path@@@",
       "@@@STEP_LOG_LINE@python.inline@    sys.exit(1)@@@",
       "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "\nimport sys, os\npath = sys.argv[1]\nmode = int(sys.argv[2])\nif not os.path.isdir(path):\n  if os.path.exists(path):\n    print \"%s exists but is not a dir\" % path\n    sys.exit(1)\n  os.makedirs(path, mode)\n",
-      "[SLAVE_BUILD]/tmp",
-      "511"
-    ],
-    "name": "makedirs tmp_dir",
-    "~followup_annotations": [
-      "@@@STEP_LOG_LINE@python.inline@@@@",
-      "@@@STEP_LOG_LINE@python.inline@import sys, os@@@",
-      "@@@STEP_LOG_LINE@python.inline@path = sys.argv[1]@@@",
-      "@@@STEP_LOG_LINE@python.inline@mode = int(sys.argv[2])@@@",
-      "@@@STEP_LOG_LINE@python.inline@if not os.path.isdir(path):@@@",
-      "@@@STEP_LOG_LINE@python.inline@  if os.path.exists(path):@@@",
-      "@@@STEP_LOG_LINE@python.inline@    print \"%s exists but is not a dir\" % path@@@",
-      "@@@STEP_LOG_LINE@python.inline@    sys.exit(1)@@@",
-      "@@@STEP_LOG_LINE@python.inline@  os.makedirs(path, mode)@@@",
-      "@@@STEP_LOG_END@python.inline@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
       "\nimport contextlib\nimport math\nimport socket\nimport sys\nimport time\nimport urllib2\n\nHASHES_URL = 'https://gold.skia.org/_/hashes'\nRETRIES = 5\nTIMEOUT = 60\nWAIT_BASE = 15\n\nsocket.setdefaulttimeout(TIMEOUT)\nfor retry in range(RETRIES):\n  try:\n    with contextlib.closing(\n        urllib2.urlopen(HASHES_URL, timeout=TIMEOUT)) as w:\n      hashes = w.read()\n      with open(sys.argv[1], 'w') as f:\n        f.write(hashes)\n        break\n  except Exception as e:\n    print 'Failed to get uninteresting hashes from %s:' % HASHES_URL\n    print e\n    if retry == RETRIES:\n      raise\n    waittime = WAIT_BASE * math.pow(2, retry)\n    print 'Retry in %d seconds.' % waittime\n    time.sleep(waittime)\n",
       "[SLAVE_BUILD]/tmp/uninteresting_hashes.txt"
     ],
     "cwd": "[SLAVE_BUILD]/skia",
     "env": {
       "BUILDTYPE": "Debug",
       "CHROME_HEADLESS": "1",
       "SKIA_OUT": "[SLAVE_BUILD]/out"
     },
     "name": "get uninteresting hashes",
@@ skipping 43 matching lines @@
       "[SLAVE_BUILD]/skimage/dm",
       "--colorImages",
       "[SLAVE_BUILD]/skimage/colorspace",
       "--nameByHash",
       "--properties",
       "gitHash",
       "abc123",
       "master",
       "client.skia",
       "builder",
-      "Test-Ubuntu-GCC-GCE-CPU-AVX2-x86-Debug",
+      "Test-Ubuntu-GCC-GCE-CPU-AVX2-x86-Debug-Trybot",
       "build_number",
       "5",
+      "issue",
+      "2100",
+      "patchset",
+      "2",
+      "patch_storage",
+      "gerrit",
       "--svgs",
       "[SLAVE_BUILD]/svg",
       "--key",
       "arch",
       "x86",
       "compiler",
       "GCC",
       "configuration",
       "Debug",
       "cpu_or_gpu",
       "CPU",
       "cpu_or_gpu_value",
       "AVX2",
       "model",
       "GCE",
       "os",
       "Ubuntu",
-      "--uninterestingHashesFile",
-      "[SLAVE_BUILD]/tmp/uninteresting_hashes.txt",
       "--writePath",
       "[CUSTOM_[SWARM_OUT_DIR]]/dm",
       "--nogpu",
       "--threads",
       "4",
       "--config",
       "565",
       "8888",
       "gpu",
       "gpusrgb",
@@ skipping 269 matching lines @@
       "SKIA_OUT": "[SLAVE_BUILD]/out"
     },
     "name": "dm"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]