It started showing up on caroline and tricky chrome informational builds, see https://uberchromegw.corp.google.com/i/chromeos.chrome/builders/caroline-tot-chrome-pfq-informational/builds/1148 and
https://uberchromegw.corp.google.com/i/chromeos.chrome/builders/tricky-tot-chrome-pfq-informational/builds/8348

Selected error messages:
03/09 08:46:58.021 WARNI|              test:0637| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 631, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 831, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 495, in execute
    dargs)
  File "/usr/local/autotest/common_lib/test.py", line 362, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 400, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/cros/video/helper_logger.py", line 82, in call
    return func(*args, **kwargs)
  File "/usr/local/autotest/tests/video_ChromeHWDecodeUsed/video_ChromeHWDecodeUsed.py", line 104, in run_once
    raise error.TestError('GPU Video Decoder Error.')
TestError: GPU Video Decoder Error.