Refactor stages 1, 2 and test_api overhaul.

scripts/slave/recipes/bisect_test/example_bisect_results.expected/failed_test.json

Index: scripts/slave/recipes/bisect_test/example_bisect_results.expected/failed_test.json
diff --git a/scripts/slave/recipes/bisect_test/example_bisect_results.expected/failed_test.json b/scripts/slave/recipes/bisect_test/example_bisect_results.expected/failed_test.json
index 3aa535e27c7ce411842362e9ea1e6ba1d9d312bb..a6b504f9d2f73649e265259fbaaadb540af5149d 100644
--- a/scripts/slave/recipes/bisect_test/example_bisect_results.expected/failed_test.json
+++ b/scripts/slave/recipes/bisect_test/example_bisect_results.expected/failed_test.json
@@ -1,6 +1,19 @@
 [
   {
     "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
+      "--",
+      "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cat",
+      "gs://fakebucket/fake/path/fake_file.txt"
+    ],
+    "name": "gsutil cat"
+  },
+  {
+    "cmd": [
       "git",
       "update-ref",
       "refs/heads/master",
@@ -132,7 +145,7 @@
       "RECIPE_MODULE[build::perf_dashboard]/resources/post_json.py"
     ],
     "name": "Post bisect results",
-    "stdin": "{\"data\": {\"aborted_reason\": null, \"bad_revision\": \"deadbeef\", \"bisect_bot\": \"linux_perf_tester\", \"bug_id\": null, \"buildbot_log_url\": \"http://build.chromium.org/p/chromium/builders//builds/\", \"change\": null, \"command\": \"src/tools/perf/run_benchmark -v --browser=release smoothness.tough_scrolling_cases\", \"culprit_data\": null, \"good_revision\": \"c001c0de\", \"metric\": \"mean_input_event_latency/mean_input_event_latency\", \"revision_data\": [], \"score\": 0, \"status\": \"failed\", \"test_type\": \"perf\", \"try_job_id\": null, \"warnings\": [\"This is a demo warning\"]}, \"url\": \"https://chromeperf.appspot.com/post_bisect_results\"}",
+    "stdin": "{\"data\": {\"aborted_reason\": null, \"bad_revision\": \"deadbeef\", \"bisect_bot\": \"linux_perf_tester\", \"bug_id\": null, \"buildbot_log_url\": \"http://build.chromium.org/p/chromium/builders//builds/\", \"change\": null, \"command\": \"src/tools/perf/run_benchmark -v --browser=release smoothness.tough_scrolling_cases\", \"culprit_data\": null, \"good_revision\": \"c001c0de\", \"metric\": \"mean_input_event_latency/mean_input_event_latency\", \"revision_data\": [], \"status\": \"failed\", \"test_type\": \"perf\", \"try_job_id\": null, \"warnings\": [\"This is a demo warning\"]}, \"url\": \"https://chromeperf.appspot.com/post_bisect_results\"}",
     "stdout": "/path/to/tmp/json",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",