Add json test results format support for SwarmingIsolatedScriptTest

scripts/slave/recipes/chromium.expected/dynamic_swarmed_sharded_failed_isolated_script_test.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]",
       "--patch_root",
       "src",
@@ skipping 404 matching lines @@
       "{\"base_task_name\": \"telemetry_gpu_unittests/Ubuntu-12.04/eeeeeeeeee/Linux Tests/571\", \"tasks\": {\"telemetry_gpu_unittests/Ubuntu-12.04/eeeeeeeeee/Linux Tests/571:2:0\": {\"shard_index\": 0, \"task_id\": \"10000\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"}, \"telemetry_gpu_unittests/Ubuntu-12.04/eeeeeeeeee/Linux Tests/571:2:1\": {\"shard_index\": 1, \"task_id\": \"10100\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10100\"}}}",
       "--task-output-dir",
       "/path/to/tmp/"
     ],
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "telemetry_gpu_unittests on Ubuntu-12.04",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",
-      "@@@STEP_TEXT@<br/>failures:<br/>test1.Test1<br/>test2.Test2<br/>test3.Test3<br/>test4.Test4<br/>@@@",
+      "@@@STEP_TEXT@<br/>failures:<br/>test3.Test3<br/>test1.Test1<br/>test1.Test2<br/>test3.Test4<br/>@@@",
       "@@@STEP_LOG_LINE@outdir_json@{@@@",
-      "@@@STEP_LOG_LINE@outdir_json@  \"0/output.json\": \"{\\\"successes\\\": [], \\\"failures\\\": [\\\"test1.Test1\\\", \\\"test2.Test2\\\"], \\\"valid\\\": true, \\\"times\\\": {\\\"test2.Test2\\\": 0.1, \\\"test1.Test1\\\": 0.1}}\", @@@",
-      "@@@STEP_LOG_LINE@outdir_json@  \"1/output.json\": \"{\\\"successes\\\": [], \\\"failures\\\": [\\\"test3.Test3\\\", \\\"test4.Test4\\\"], \\\"valid\\\": true, \\\"times\\\": {\\\"test3.Test3\\\": 0.1, \\\"test4.Test4\\\": 0.1}}\", @@@",
+      "@@@STEP_LOG_LINE@outdir_json@  \"0/output.json\": \"{\\\"tests\\\": {\\\"test1\\\": {\\\"Test1\\\": {\\\"expected\\\": \\\"PASS\\\", \\\"actual\\\": \\\"FAIL FAIL TIMEOUT\\\"}, \\\"Test2\\\": {\\\"expected\\\": \\\"PASS TIMEOUT\\\", \\\"actual\\\": \\\"FAIL FAIL FAIL\\\"}}}, \\\"interrupted\\\": false, \\\"path_delimiter\\\": \\\".\\\", \\\"version\\\": 3, \\\"seconds_since_epoch\\\": 14000000, \\\"num_failures_by_type\\\": {\\\"FAIL\\\": 2, \\\"PASS\\\": 0}}\", @@@",
+      "@@@STEP_LOG_LINE@outdir_json@  \"1/output.json\": \"{\\\"tests\\\": {\\\"test3\\\": {\\\"Test3\\\": {\\\"expected\\\": \\\"PASS\\\", \\\"actual\\\": \\\"FAIL FAIL TIMEOUT\\\"}, \\\"Test4\\\": {\\\"expected\\\": \\\"PASS TIMEOUT\\\", \\\"actual\\\": \\\"FAIL FAIL FAIL\\\"}}}, \\\"interrupted\\\": false, \\\"path_delimiter\\\": \\\".\\\", \\\"version\\\": 3, \\\"seconds_since_epoch\\\": 14000001, \\\"num_failures_by_type\\\": {\\\"FAIL\\\": 2, \\\"PASS\\\": 0}}\", @@@",
       "@@@STEP_LOG_LINE@outdir_json@  \"summary.json\": \"{\\\"shards\\\": [{\\\"internal_failure\\\": false, \\\"failure\\\": true, \\\"exit_code\\\": \\\"1\\\"}, {\\\"internal_failure\\\": false, \\\"failure\\\": true, \\\"exit_code\\\": \\\"1\\\"}]}\"@@@",
       "@@@STEP_LOG_LINE@outdir_json@}@@@",
       "@@@STEP_LOG_END@outdir_json@@@",
       "@@@STEP_LINK@shard #0 (failed)@https://chromium-swarm.appspot.com/user/task/10000@@@",
       "@@@STEP_LINK@shard #1 (failed)@https://chromium-swarm.appspot.com/user/task/10100@@@",
       "@@@STEP_FAILURE@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "1 tests failed: ['telemetry_gpu_unittests']",
     "recipe_result": null,
     "status_code": 1
   }
 ]