Roll recipe dependencies (nontrivial).

scripts/slave/recipes/android/builder.expected/full_chromium_perf_Android_Builder.json

 [
   {
     "cmd": [],
     "name": "ensure_goma"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::cipd]/resources/bootstrap.py",
@@ skipping 63 matching lines @@
       "8675309",
       "--patchset",
       "1",
       "--output_json",
       "/path/to/tmp/json",
       "--revision",
       "src@267739",
       "--output_manifest"
     ],
     "env": {
-      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+      "PATH": "RECIPE_PACKAGE_REPO[depot_tools]:%(PATH)s"
     },
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"src\": \"267739\"@@@",
       "@@@STEP_LOG_LINE@json.output@  }, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"manifest\": {@@@",
@@ skipping 563 matching lines @@
     "~followup_annotations": [
       "@@@STEP_TEXT@Android Galaxy S5 Perf (1)<br />Android Power Nexus 5X Perf (1)@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]