Roll recipe dependencies (nontrivial).

scripts/slave/recipes/infra/recipe_roll_tryjob.expected/tryjob.json

 [
   {
     "cmd": [
       "/opt/infra-tools/authutil",
       "token"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "Get auth token",
     "stdout": "/path/to/tmp/"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'infra', 'url': 'https://chromium.googlesource.com/infra/infra.git'}]"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient setup"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "sync",
       "--verbose",
       "--with_branch_heads",
       "--nohooks",
       "-j8",
       "--reset",
       "--force",
       "--upstream",
       "--no-nag-max",
       "--delete_unversioned_trees",
       "--revision",
       "infra@origin/master",
       "--output-json",
       "/path/to/tmp/json"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient sync",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"solutions\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"infra/\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"revision\": \"5e03a58dc0850e5137a8ebbce29610670c756aed\"@@@",
       "@@@STEP_LOG_LINE@json.output@    }@@@",
       "@@@STEP_LOG_LINE@json.output@  }@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
       "@@@SET_BUILD_PROPERTY@got_revision@\"5e03a58dc0850e5137a8ebbce29610670c756aed\"@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "recurse",
       "git",
       "config",
       "user.name",
       "local_bot"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient recurse (git config user.name)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "recurse",
       "git",
       "config",
       "user.email",
       "local_bot@example.com"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient recurse (git config user.email)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/pycurl.py",
       "https://luci-config.appspot.com/_ah/api/config/v1/projects",
       "--outfile",
       "/path/to/tmp/",
       "--headers-json",
       "{\"Authorization\": \"Bearer ya29.foobar\"}"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "Get luci-config projects"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/pycurl.py",
       "https://luci-config.appspot.com//_ah/api/config/v1/config_sets/projects%2Frecipe_engine%2Frefs%2Fheads%2Fmaster/config/recipes.cfg",
       "--outfile",
       "/path/to/tmp/",
       "--headers-json",
       "{\"Authorization\": \"Bearer ya29.foobar\"}"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "Get project 'recipe_engine' config 'recipes.cfg'"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/pycurl.py",
       "https://luci-config.appspot.com//_ah/api/config/v1/config_sets/projects%2Fbuild%2Frefs%2Fheads%2Fmaster/config/recipes.cfg",
       "--outfile",
       "/path/to/tmp/",
       "--headers-json",
       "{\"Authorization\": \"Bearer ya29.foobar\"}"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "Get project 'build' config 'recipes.cfg'"
   },
   {
     "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]/recipe_engine/recipe_engine",
       "511"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "makedirs recipe_engine directory",
     "~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)@@@",
@@ skipping 46 matching lines @@
     ]
   },
   {
     "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]/build/build",
       "511"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "makedirs build directory",
     "~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)@@@",
@@ skipping 51 matching lines @@
   },
   {
     "cmd": [
       "[SLAVE_BUILD]/infra/ENV/bin/python",
       "-u",
       "[SLAVE_BUILD]/recipe_engine/recipe_engine/recipes.py",
       "--package",
       "[SLAVE_BUILD]/recipe_engine/recipe_engine/infra/config/recipes.cfg",
       "simulation_test"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "recipe_engine tests"
   },
   {
     "cmd": [
       "[SLAVE_BUILD]/infra/ENV/bin/python",
       "-u",
       "[SLAVE_BUILD]/build/build/recipes.py",
       "-O",
       "recipe_engine=[SLAVE_BUILD]/recipe_engine/recipe_engine",
       "--package",
       "[SLAVE_BUILD]/build/build/infra/config/recipes.cfg",
       "simulation_test"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "build tests"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]