For M64, M65, M66, it is flaky with small rate on several boards (it looks like independent of boards, but often seen it on daisy family)

Daisy_spring/10329.0.0
https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/171466369-chromeos-test/chromeos6-row2-rack16-host10

Daisy/10322.0.0
https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/170921865-chromeos-test/chromeos2-row4-rack7-host3

TestError: Media.RTCVideoDecoderInitDecodeSucces not loaded or histogram bucket not found or histogram bucket found at < 100%

01/21 16:29:53.072 ERROR|          parallel:0026| child process failed
01/21 16:29:53.087 DEBUG|          parallel:0030| Traceback (most recent call last):
01/21 16:29:53.088 DEBUG|          parallel:0030|   File "/usr/local/autotest/bin/parallel.py", line 18, in fork_start
01/21 16:29:53.089 DEBUG|          parallel:0030|     l()
01/21 16:29:53.089 DEBUG|          parallel:0030|   File "/usr/local/autotest/bin/job.py", line 488, in <lambda>
01/21 16:29:53.090 DEBUG|          parallel:0030|     l = lambda : test.runtest(self, url, tag, args, dargs)
01/21 16:29:53.091 DEBUG|          parallel:0030|   File "/usr/local/autotest/bin/test.py", line 117, in runtest
01/21 16:29:53.091 DEBUG|          parallel:0030|     job.sysinfo.log_after_each_iteration)
01/21 16:29:53.092 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 919, in runtest
01/21 16:29:53.092 DEBUG|          parallel:0030|     mytest._exec(args, dargs)
01/21 16:29:53.093 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 631, in _exec
01/21 16:29:53.093 DEBUG|          parallel:0030|     _call_test_function(self.execute, *p_args, **p_dargs)
01/21 16:29:53.094 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 831, in _call_test_function
01/21 16:29:53.095 DEBUG|          parallel:0030|     return func(*args, **dargs)
01/21 16:29:53.095 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 495, in execute
01/21 16:29:53.096 DEBUG|          parallel:0030|     dargs)
01/21 16:29:53.097 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 362, in _call_run_once_with_retry
01/21 16:29:53.097 DEBUG|          parallel:0030|     postprocess_profiled_run, args, dargs)
01/21 16:29:53.098 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/test.py", line 400, in _call_run_once
01/21 16:29:53.098 DEBUG|          parallel:0030|     self.run_once(*args, **dargs)
01/21 16:29:53.099 DEBUG|          parallel:0030|   File "/usr/local/autotest/cros/video/helper_logger.py", line 82, in call
01/21 16:29:53.099 DEBUG|          parallel:0030|     return func(*args, **kwargs)
01/21 16:29:53.100 DEBUG|          parallel:0030|   File "/usr/local/autotest/tests/video_ChromeRTCHWDecodeUsed/video_ChromeRTCHWDecodeUsed.py", line 81, in run_once
01/21 16:29:53.100 DEBUG|          parallel:0030|     histogram_verifier.verify(cr, histogram_name, histogram_bucket_val)
01/21 16:29:53.101 DEBUG|          parallel:0030|   File "/usr/local/autotest/cros/video/histogram_verifier.py", line 72, in verify
01/21 16:29:53.102 DEBUG|          parallel:0030|     sleep_interval=1)
01/21 16:29:53.102 DEBUG|          parallel:0030|   File "/usr/local/autotest/common_lib/utils.py", line 2750, in poll_for_condition
01/21 16:29:53.103 DEBUG|          parallel:0030|     raise exception
01/21 16:29:53.103 DEBUG|          parallel:0030| TestError: Media.RTCVideoDecoderInitDecodeSucces not loaded or histogram bucket not found or histogram bucket found at < 100%


 http://crbug.com/791131  may be related?