Add a check that the Chromedriver prebuilt name is expected.

scripts/slave/recipes/chromedriver.expected/Android_ChromeDriver_Tests__dbg__basic.json

Index: scripts/slave/recipes/chromedriver.expected/Android_ChromeDriver_Tests__dbg__basic.json
diff --git a/scripts/slave/recipes/chromedriver.expected/Android_ChromeDriver_Tests__dbg__basic.json b/scripts/slave/recipes/chromedriver.expected/Android_ChromeDriver_Tests__dbg__basic.json
index 4ab5053046b151528de9abd3a5a72e31bfefe470..2f2d3b8656b18aaed43a57d5d0e82e2d1d9b9bdd 100644
--- a/scripts/slave/recipes/chromedriver.expected/Android_ChromeDriver_Tests__dbg__basic.json
+++ b/scripts/slave/recipes/chromedriver.expected/Android_ChromeDriver_Tests__dbg__basic.json
@@ -454,7 +454,7 @@
       "--url",
       "gs://chromedriver-data/prebuilts",
       "--dst",
-      "[TMP_BASE]/prebuilt_tmp_1/build.zip",
+      "[TMP_BASE]/prebuilt_tmp_1",
       "--partial-name",
       "gs://chromedriver-data/prebuilts/r"
     ],
@@ -468,10 +468,33 @@
     "cmd": [
       "python",
       "-u",
+      "\nimport json, os, sys\nif os.path.exists(sys.argv[1]) and os.path.isdir(sys.argv[1]):\n  with open(sys.argv[2], 'w') as f:\n    json.dump(os.listdir(sys.argv[1]), f)\n",
+      "[TMP_BASE]/prebuilt_tmp_1",
+      "/path/to/tmp/json"
+    ],
+    "name": "Download Prebuilts.listdir get prebuilt filename",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@[@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"r111111.zip\"@@@",
+      "@@@STEP_LOG_LINE@json.output@]@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@STEP_LOG_LINE@python.inline@@@@",
+      "@@@STEP_LOG_LINE@python.inline@import json, os, sys@@@",
+      "@@@STEP_LOG_LINE@python.inline@if os.path.exists(sys.argv[1]) and os.path.isdir(sys.argv[1]):@@@",
+      "@@@STEP_LOG_LINE@python.inline@  with open(sys.argv[2], 'w') as f:@@@",
+      "@@@STEP_LOG_LINE@python.inline@    json.dump(os.listdir(sys.argv[1]), f)@@@",
+      "@@@STEP_LOG_END@python.inline@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "RECIPE_MODULE[build::zip]/resources/unzip.py"
     ],
     "name": "Download Prebuilts.unzip prebuilt",
-    "stdin": "{\"output\": \"[TMP_BASE]/prebuilt_tmp_1/unzipped\", \"zip_file\": \"[TMP_BASE]/prebuilt_tmp_1/build.zip\"}",
+    "stdin": "{\"output\": \"[TMP_BASE]/prebuilt_tmp_1/unzipped\", \"zip_file\": \"[TMP_BASE]/prebuilt_tmp_1/r111111.zip\"}",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]