Include timestamp in nanobench JSON file name

infra/bots/recipes/swarm_trigger.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 # Recipe module for Skia Swarming trigger.
 
 
 import os
 import json
@@ skipping 455 matching lines @@
       api.properties['mastername'],
       api.properties['slavename'],
       api.properties['buildnumber'],
       builder_cfg,
       got_revision,
       infrabots_dir,
       extra_isolate_hashes=extra_hashes,
       expiration=expiration,
       hard_timeout=hard_timeout,
       io_timeout=io_timeout,
-      cipd_packages=cipd_packages)
+      cipd_packages=cipd_packages,
+      store_output=False)
 
 
 def perf_steps_collect(api, task, builder_cfg, got_revision, infrabots_dir):
   """Wait for perf steps to finish and upload results."""
   # Wait for nanobench to finish, download the results.
-  api.run.rmtree(task.task_output_dir)
   if not api.vars.upload_perf_results:  # pragma: nocover
     api.swarming.collect_swarming_task(task)
     return
 
   perf_hash = api.swarming.collect_swarming_task_isolate_hash(task)
 
   # Upload the results.
   task = trigger_task(
       api,
       'upload_nano_results',
@@ skipping 332 matching lines @@
           mastername='client.skia',
           slavename='skiabot-linux-swarm-000',
           buildnumber=5,
           path_config='kitchen',
           revision='abc123',
           **gerrit_kwargs) +
       api.step_data(
           'upload new .isolated file for test_skia',
           stdout=api.raw_io.output('def456 XYZ.isolated'))
   )