Refactor stages 1, 2 and test_api overhaul.

scripts/slave/recipes/bisection/desktop_bisect.expected/basic_perf_tryjob.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport sys, os\npath = sys.argv[1]\nmode = int(sys.argv[2])\nif not os.path.isdir(path):\n  if os.path.exists(path):\n    print \"%s exists but is not a dir\" % path\n    sys.exit(1)\n  os.makedirs(path, mode)\n",
       "[BUILDER_CACHE]/linux_perf_bisect",
       "511"
     ],
     "name": "makedirs checkout path",
@@ skipping 475 matching lines @@
       "@@@STEP_LOG_LINE@Captured Output@RESULT telemetry_page_measurement_results: num_errored= 0 count@@@",
       "@@@STEP_LOG_LINE@Captured Output@@@@",
       "@@@STEP_LOG_LINE@Captured Output@View online at http://storage.googleapis.com/chromium-telemetry/html-results/results-with_patch@@@",
       "@@@STEP_LOG_END@Captured Output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
+      "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
+      "*RESULT dummy: dummy= [5.83,6.013,5.573]ms\nAvg dummy: 5.907711ms\nSd  dummy: 0.255921ms\nRESULT telemetry_page_measurement_results: num_failed= 0 count\nRESULT telemetry_page_measurement_results: num_errored= 0 count\n\nView online at http://storage.googleapis.com/chromium-telemetry/html-results/results-with_patch\n",
+      "[TMP_BASE]/perf-test-output_tmp_1/results.txt"
+    ],
+    "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
+    "name": "write buildbot output to disk"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}, {'custom_deps': {'src/chrome/test/data/firefox2_profile/searchplugins': None, 'src/chrome/test/data/firefox2_searchplugins': None, 'src/chrome/test/data/firefox3_profile/searchplugins': None, 'src/chrome/test/data/firefox3_searchplugins': None, 'src/chrome/test/data/osdd': None, 'src/chrome/test/data/perf/frame_rate/private': None, 'src/chrome/test/data/plugin': None, 'src/chrome/test/data/ssl/certs': None, 'src/data/autodiscovery': None, 'src/data/esctf': None, 'src/data/mach_ports': None, 'src/data/memory_test': None, 'src/data/mozilla_js_tests': None, 'src/data/selenium_core': None, 'src/data/tab_switching': None, 'src/tools/grit/grit/test/data': None, 'src/webkit/data/bmp_decoder': None, 'src/webkit/data/ico_decoder': None, 'src/webkit/data/test_shell/plugins': None, 'src/webkit/data/xbm_decoder': None}, 'deps_file': '.DEPS.git', 'managed': False, 'name': 'src-internal', 'url': 'https://chrome-internal.googlesource.com/chrome/src-internal.git'}, {'deps_file': '.DEPS.git', 'managed': True, 'name': 'catapult', 'url': 'https://chromium.googlesource.com/external/github.com/catapult-project/catapult.git'}]",
       "--root",
       "src",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\", \"src/buildtools\": \"got_buildtools_revision\", \"src/native_client\": \"got_nacl_revision\", \"src/third_party/angle\": \"got_angle_revision\", \"src/third_party/webrtc\": \"got_webrtc_revision\", \"src/tools/swarming_client\": \"got_swarming_client_revision\", \"src/v8\": \"got_v8_revision\"}",
       "--git-cache-dir",
       "[GIT_CACHE]",
       "--rietveld_server",
@@ skipping 272 matching lines @@
       "@@@STEP_LOG_LINE@Captured Output@Avg dummy: 5.907711ms@@@",
       "@@@STEP_LOG_LINE@Captured Output@Sd  dummy: 0.255921ms@@@",
       "@@@STEP_LOG_LINE@Captured Output@RESULT telemetry_page_measurement_results: num_failed= 0 count@@@",
       "@@@STEP_LOG_LINE@Captured Output@RESULT telemetry_page_measurement_results: num_errored= 0 count@@@",
       "@@@STEP_LOG_LINE@Captured Output@@@@",
       "@@@STEP_LOG_LINE@Captured Output@View online at http://storage.googleapis.com/chromium-telemetry/html-results/results-without_patch@@@",
       "@@@STEP_LOG_END@Captured Output@@@"
     ]
   },
   {
+    "cmd": [
+      "python",
+      "-u",
+      "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
+      "*RESULT dummy: dummy= [5.83,6.013,5.573]ms\nAvg dummy: 5.907711ms\nSd  dummy: 0.255921ms\nRESULT telemetry_page_measurement_results: num_failed= 0 count\nRESULT telemetry_page_measurement_results: num_errored= 0 count\n\nView online at http://storage.googleapis.com/chromium-telemetry/html-results/results-without_patch\n",
+      "[TMP_BASE]/perf-test-output_tmp_2/results.txt"
+    ],
+    "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
+    "name": "write buildbot output to disk (2)"
+  },
+  {
     "cmd": [],
     "cwd": "[BUILDER_CACHE]/linux_perf_bisect",
     "name": "Results",
     "~followup_annotations": [
       "@@@STEP_TEXT@No values from test with patch, or none from test without patch.",
       "Output with patch:",
       "*RESULT dummy: dummy= [5.83,6.013,5.573]ms",
       "Avg dummy: 5.907711ms",
       "Sd  dummy: 0.255921ms",
       "RESULT telemetry_page_measurement_results: num_failed= 0 count",
@@ skipping 30 matching lines @@
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]