linux-perf is failing on the chromium.perf waterfall due to it not being able to find some logdog environment variables. 

See most recent failing build: https://uberchromegw.corp.google.com/i/chromium.perf/builders/linux-perf/builds/0

and logs from one of the tests: 
https://uberchromegw.corp.google.com/i/chromium.perf/builders/linux-perf/builds/0/steps/load_library_perf_tests%20on%20NVIDIA%20GPU%20on%20Linux/logs/stdio

Two interesting things you can see here are that

1) it doesn't contain the environment variables we need like the linux bots on our fyi waterfall. 
LOGDOG_COORDINATOR_HOST: logs.chromium.org
 LOGDOG_STREAM_PREFIX: bb/chromium.perf.fyi/One_Buildbot_Step_Test_Builder/5088
 LOGDOG_STREAM_PROJECT: chrome
 LOGDOG_STREAM_SERVER_PATH: unix:/b/build/rr/tmppaEcas/butler.sock

2) the stack trace points to this with a bootstrapping error
ERROR:root:Ignore this exception. crbug.com/675666
Traceback (most recent call last):
  File "/b/c/b/linux_perf/src/build/android/pylib/utils/decorators.py", line 32, in wrapper
    return f(*args, **kwargs)
  File "/b/c/b/linux_perf/src/build/android/pylib/utils/logdog_helper.py", line 51, in open_text
    return get_logdog_client().open_text(name)
  File "/b/c/b/linux_perf/src/build/android/pylib/utils/decorators.py", line 16, in wrapper
    memoize_dict[key] = f(*args, **kwargs)
  File "/b/c/b/linux_perf/src/build/android/pylib/utils/logdog_helper.py", line 92, in get_logdog_client
    return bootstrap.ButlerBootstrap.probe().stream_client()
  File "/b/c/b/linux_perf/src/tools/swarming_client/libs/logdog/bootstrap.py", line 48, in probe
    raise NotBootstrappedError('Missing project [%s]' % (cls._ENV_PROJECT,))
NotBootstrappedError: Missing project [LOGDOG_STREAM_PROJECT]

The bug implies this might be a red herring, but our code does fail further down when it tries to utilize the output stream (output_json_file is the variable name).  

Any ideas why the configuration of this bot is different?