Fixes for presubmit recipe

infra/bots/recipes/swarm_presubmit.expected/presubmit.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",
       "[CUSTOM_/_B_WORK]",
       "511"
     ],
     "name": "makedirs checkout_path",
@@ skipping 104 matching lines @@
       "BUILDTYPE": "Release",
       "CHROME_HEADLESS": "1",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]:RECIPE_PACKAGE_REPO[depot_tools]",
       "SKIA_OUT": "[SLAVE_BUILD]/out"
     },
     "name": "gclient recurse (git config user.email)"
   },
   {
     "cmd": [
       "git",
+      "checkout",
+      "-b",
+      "tmp_00000000-0000-0000-0000-000000000000"
+    ],
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "name": "create git branch"
+  },
+  {
+    "cmd": [
+      "git",
+      "status"
+    ],
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "name": "git status"
+  },
+  {
+    "cmd": [
+      "git",
       "cl",
       "presubmit",
-      "--force"
+      "--force",
+      "-v",
+      "-v"
     ],
     "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "env": {
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
+    },
     "name": "presubmit"
   },
   {
+    "cmd": [
+      "git",
+      "reset",
+      "--hard",
+      "origin/master"
+    ],
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "name": "git reset"
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "origin/master"
+    ],
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "name": "checkout origin/master"
+  },
+  {
+    "cmd": [
+      "git",
+      "branch",
+      "-D",
+      "tmp_00000000-0000-0000-0000-000000000000"
+    ],
+    "cwd": "[CUSTOM_/_B_WORK]/skia",
+    "name": "delete git branch"
+  },
+  {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]