auto_bisect: fix path for checking DEPS

scripts/slave/recipes/bisection/desktop_bisect.expected/basic.json

Index: scripts/slave/recipes/bisection/desktop_bisect.expected/basic.json
diff --git a/scripts/slave/recipes/bisection/desktop_bisect.expected/basic.json b/scripts/slave/recipes/bisection/desktop_bisect.expected/basic.json
index 9af2f1e5dd619d9e4278fdd2613069a9b71cf7c5..d97297565d0d6923a7fb0253f93b94677dc07e86 100644
--- a/scripts/slave/recipes/bisection/desktop_bisect.expected/basic.json
+++ b/scripts/slave/recipes/bisection/desktop_bisect.expected/basic.json
@@ -204,6 +204,28 @@
   },
   {
     "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",
+      "[BUILDER_CACHE]/linux_perf_bisect",
+      "511"
+    ],
+    "name": "makedirs checkout path (2)",
+    "~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": [
       "git",
       "diff",
       "--cached",
@@ -219,6 +241,7 @@
   },
   {
     "cmd": [],
+    "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
     "name": "***LEGACY BISECT (deprecated)***"
   },
   {
@@ -229,10 +252,12 @@
       "-w",
       "[CACHE]/bisect"
     ],
+    "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
     "name": "Preparing for Bisection"
   },
   {
     "cmd": [],
+    "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
     "name": "ensure_goma (2)"
   },
   {
@@ -247,6 +272,7 @@
       "--json-output",
       "/path/to/tmp/json"
     ],
+    "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
     "name": "ensure_goma.install cipd (2)",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
@@ -271,6 +297,7 @@
       "--service-account-json",
       "/creds/service_accounts/service-account-goma-client.json"
     ],
+    "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
     "name": "ensure_goma.ensure_installed (2)",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
@@ -311,6 +338,7 @@
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"buildername\": \"linux_perf_bisect\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.perf\", \"patch_project\": \"chromium\", \"patchset\": 1, \"path_config\": \"kitchen\", \"project\": \"chrome\", \"recipe\": \"bisection/desktop_bisect\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": \"HEAD\", \"rietveld\": \"https://codereview.chromium.org\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
+    "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
     "name": "Running Bisection"
   },
   {