[WebView] Update CTS logic to load test name from json.

scripts/slave/recipe_modules/chromium_android/example.expected/webview_cts_unexecuted_tests.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport os, sys\n\nbuild_path = sys.argv[1]\nif os.path.exists(build_path):\n  for (path, dir, files) in os.walk(build_path):\n    for cur_file in files:\n      if cur_file.endswith('index.lock'):\n        path_to_file = os.path.join(path, cur_file)\n        print 'deleting %s' % path_to_file\n        os.remove(path_to_file)\n",
       "[SLAVE_BUILD]"
     ],
     "name": "cleanup index.lock",
     "~followup_annotations": [
@@ skipping 823 matching lines @@
       "--webview_arg_1",
       "--webview_arg_2"
     ],
     "name": "write webview command line file"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
-      "[SLAVE_BUILD]/src/android_webview/tools/cts_config/webview_cts_gcs_path.txt",
+      "[SLAVE_BUILD]/src/android_webview/tools/cts_config/webview_cts_gcs_path.json",
       "/path/to/tmp/"
     ],
-    "name": "Fetch for the name of the cts file",
-    "~followup_annotations": [
-      "@@@STEP_LOG_LINE@cts_file_name@android-cts-5.1_r5-linux_x86-arm.zip@@@",
-      "@@@STEP_LOG_END@cts_file_name@@@"
-    ]
+    "name": "Fetch CTS filename data"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[SLAVE_BUILD]/src/android_webview/tools/cts_config/expected_failure_on_bot.json",
       "/path/to/tmp/"
     ],
-    "name": "Fetch the expected failures tests for CTS from chromium checkout"
+    "name": "Fetch expected failures data"
   },
   {
     "cmd": [],
     "name": "Update CTS"
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport os, sys\nfrom common import chromium_utils # Error? See https://crbug.com/584783.\n\n\nif os.path.exists(sys.argv[1]):\n  chromium_utils.RemoveDirectory(sys.argv[1])\n",
@@ skipping 37 matching lines @@
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
       "--",
       "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "----",
       "cp",
-      "gs://chromium-cts/android-cts-5.1_r5-linux_x86-arm.zip",
-      "[CACHE]/android_cts/android-cts-5.1_r5-linux_x86-arm.zip"
+      "gs://chromium-cts/cts_arm64_L.zip",
+      "[CACHE]/android_cts/cts_arm64_L.zip"
     ],
     "name": "Update CTS.gsutil Download new CTS",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::zip]/resources/unzip.py"
     ],
     "name": "Update CTS.Extract new CTS",
-    "stdin": "{\"output\": \"[CACHE]/android_cts/unzipped\", \"zip_file\": \"[CACHE]/android_cts/android-cts-5.1_r5-linux_x86-arm.zip\"}",
+    "stdin": "{\"output\": \"[CACHE]/android_cts/unzipped\", \"zip_file\": \"[CACHE]/android_cts/cts_arm64_L.zip\"}",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "cmd": [
       "[CACHE]/android_cts/unzipped/android-cts/tools/cts-tradefed",
       "run",
       "cts",
       "-p",
@@ skipping 35 matching lines @@
       "@@@STEP_FAILURE@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "Tests not executed.",
     "recipe_result": null,
     "status_code": 1
   }
 ]