Started seeing a lot of errors in gru-release 3 days ago.  I see some naming errors in SimpleChromeWorkflow:

@@@STEP_FAILURE@@@
06:38:49: ERROR: <type 'exceptions.ValueError'>: Expecting , delimiter: line 4 column 1 (char 111)
Traceback (most recent call last):
  File "/b/cbuild/internal_master/chromite/cbuildbot/failures_lib.py", line 172, in wrapped_functor
    return functor(*args, **kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/generic_stages.py", line 903, in UploadArtifact
    upload_urls = self._GetUploadUrls(filename)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/generic_stages.py", line 884, in _GetUploadUrls
    json_file = json.loads(custom_artifacts_file)
  File "/usr/lib/python2.7/json/__init__.py", line 326, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
    obj, end = self.scan_once(s, idx)
ValueError: Expecting , delimiter: line 4 column 1 (char 111)

<type 'exceptions.ValueError'>: Expecting , delimiter: line 4 column 1 (char 111)
Traceback (most recent call last):
  File "/b/cbuild/internal_master/chromite/cbuildbot/failures_lib.py", line 172, in wrapped_functor
    return functor(*args, **kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/generic_stages.py", line 903, in UploadArtifact
    upload_urls = self._GetUploadUrls(filename)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/generic_stages.py", line 884, in _GetUploadUrls
    json_file = json.loads(custom_artifacts_file)
  File "/usr/lib/python2.7/json/__init__.py", line 326, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
    obj, end = self.scan_once(s, idx)
ValueError: Expecting , delimiter: line 4 column 1 (char 111)

<type 'exceptions.ValueError'>: Expecting , delimiter: line 4 column 1 (char 111)
Traceback (most recent call last):
  File "/b/cbuild/internal_master/chromite/cbuildbot/failures_lib.py", line 172, in wrapped_functor
    return functor(*args, **kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/generic_stages.py", line 903, in UploadArtifact
    upload_urls = self._GetUploadUrls(filename)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/generic_stages.py", line 884, in _GetUploadUrls
    json_file = json.loads(custom_artifacts_file)
  File "/usr/lib/python2.7/json/__init__.py", line 326, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
    obj, end = self.scan_once(s, idx)
ValueError: Expecting , delimiter: line 4 column 1 (char 111)

from gru-release/462: https://uberchromegw.corp.google.com/i/chromeos/builders/gru-release/builds/462