e.g.)
https://build.chromium.org/p/chromium.android/builders/Android%20Cronet%20Lollipop%20Builder/builds/4726/steps/gsutil%20Upload%20Test%20Trace/logs/stdio

python -u /b/build/scripts/slave/recipe_modules/gsutil/resources/gsutil_wrapper.py -- /b/build/scripts/slave/.recipe_deps/depot_tools/gsutil.py ---- cp /tmp/test_runner_traceG1xMWb/test_trace.json 'gs://None/Android Cronet Lollipop Builder/trace_4726.json'
@@@STEP_LINK@stdout-->stdio@https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.android%2FAndroid_Cronet_Lollipop_Builder%2F4726%2F%2B%2Frecipes%2Fsteps%2Fgsutil_Upload_Test_Trace%2F0%2Fstdout@@@
in dir /b/build/slave/Android_Cronet_Lollipop_Builder/build:
 allow_subannotations: False
 base_name: gsutil Upload Test Trace
 cmd: ['python', '-u', '/b/build/scripts/slave/recipe_modules/gsutil/resources/gsutil_wrapper.py', '--', '/b/build/scripts/slave/.recipe_deps/depot_tools/gsutil.py', '----', 'cp', '/tmp/test_runner_traceG1xMWb/test_trace.json', 'gs://None/Android Cronet Lollipop Builder/trace_4726.json']
 infra_step: True
 name: gsutil Upload Test Trace
 nest_level: 0
 ok_ret: frozenset([0])
 trigger_specs: []
full environment:
 AWS_CREDENTIAL_FILE: /b/build/site_config/.boto
 BOTO_CONFIG: /b/build/site_config/.boto
 BUILDBOT_BLAMELIST: [u'drcrash@chromium.org', u'gogerald@chromium.org', u'skia-deps-roller@chromium.org']
 BUILDBOT_BRANCH: master
 BUILDBOT_BUILDBOTURL: https://build.chromium.org/p/chromium.android/
 BUILDBOT_BUILDERNAME: Android Cronet Lollipop Builder
 BUILDBOT_BUILDNUMBER: 4726
 BUILDBOT_CLOBBER: 
 BUILDBOT_GOT_REVISION: None
 BUILDBOT_MASTERNAME: chromium.android
 BUILDBOT_REVISION: ceb6d93b695b137481f050f5b967d882a77b7398
 BUILDBOT_SCHEDULER: android_commits
 BUILDBOT_SLAVENAME: build86-b1
 CHROME_HEADLESS: 1
 DISPLAY: :0.0
 GIT_USER_AGENT: linux2 git/2.11.0 build86-b1.labs.chromium.org
 HOME: /home/chrome-bot
 LANG: en_US.UTF-8
 LOGDOG_COORDINATOR_HOST: services-dot-luci-logdog.appspot.com
 LOGDOG_STREAM_PREFIX: bb/chromium.android/Android_Cronet_Lollipop_Builder/4726
 LOGDOG_STREAM_PROJECT: chromium
 LOGDOG_STREAM_SERVER_PATH: unix:/b/build/.recipe_runtime/tmpVIt7Jz/butler.sock
 LOGNAME: chrome-bot
 PAGER: cat
 PATH: /home/chrome-bot/slavebin:/b/depot_tools:/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
 PWD: /b/build/slave/Android_Cronet_Lollipop_Builder/build
 PYTHONPATH: /b/build/site_config:/b/build/scripts:/b/build/scripts/release:/b/build/third_party:/b/build/third_party/requests_2_10_0:/b/build_internal/site_config:/b/build_internal/symsrc:/b/build/slave:/b/build/third_party/buildbot_slave_8_4:/b/build/third_party/twisted_10_2:
 PYTHONUNBUFFERED: 1
 SHELL: /bin/bash
 USER: chrome-bot

BadRequestException: 400 Invalid bucket name: 'None'.
WARNING:root:Command /usr/bin/python -u /b/build/scripts/slave/.recipe_deps/depot_tools/gsutil.py -- cp /tmp/test_runner_traceG1xMWb/test_trace.json gs://None/Android Cronet Lollipop Builder/trace_4726.json failed with retcode 1, try 1.1.
BadRequestException: 400 Invalid bucket name: 'None'.
WARNING:root:Command /usr/bin/python -u /b/build/scripts/slave/.recipe_deps/depot_tools/gsutil.py -- cp /tmp/test_runner_traceG1xMWb/test_trace.json gs://None/Android Cronet Lollipop Builder/trace_4726.json failed with retcode 1, try 1.2.
WARNING:root:Trying harder: deleting tracker files
BadRequestException: 400 Invalid bucket name: 'None'.
WARNING:root:Command /usr/bin/python -u /b/build/scripts/slave/.recipe_deps/depot_tools/gsutil.py -- cp /tmp/test_runner_traceG1xMWb/test_trace.json gs://None/Android Cronet Lollipop Builder/trace_4726.json failed with retcode 1, try 2.1.
BadRequestException: 400 Invalid bucket name: 'None'.
WARNING:root:Command /usr/bin/python -u /b/build/scripts/slave/.recipe_deps/depot_tools/gsutil.py -- cp /tmp/test_runner_traceG1xMWb/test_trace.json gs://None/Android Cronet Lollipop Builder/trace_4726.json failed with retcode 1, try 2.2.
WARNING:root:Trying harder: deleting tracker files
ERROR:root:Command /b/build/scripts/slave/.recipe_deps/depot_tools/gsutil.py -- cp /tmp/test_runner_traceG1xMWb/test_trace.json gs://None/Android Cronet Lollipop Builder/trace_4726.json failed 4 retries, giving up.
step returned non-zero exit code: 1
@@@STEP_EXCEPTION@@@