I'm seeing this error message on several logs:

I 8278.585s Main  Upload results for test type "gtest", test package "content_browsertests" to test-results.appspot.com
E 8278.600s Main  Failure while logging to test-results.appspot.com
Traceback (most recent call last):
  File "/b/c/b/Lollipop_Low_end_Tester/src/build/android/pylib/results/report_results.py", line 66, in _LogToFlakinessDashboard
    results, flakiness_server, dashboard_test_type)
  File "/b/c/b/Lollipop_Low_end_Tester/src/build/android/pylib/results/flakiness_dashboard/results_uploader.py", line 179, in Upload
    uploader = ResultsUploader(test_type)
  File "/b/c/b/Lollipop_Low_end_Tester/src/build/android/pylib/results/flakiness_dashboard/results_uploader.py", line 102, in __init__
    self._build_name = slave_utils.SlaveBuildName(host_paths.DIR_SOURCE_ROOT)
  File "/b/build/scripts/slave/slave_utils.py", line 195, in SlaveBuildName
    return os.path.basename(SlaveBaseDir(chrome_dir))
  File "/b/build/scripts/slave/slave_utils.py", line 220, in SlaveBaseDir
    chrome_dir)
PathNotFound: Unable to find slave base dir above /b/c/b/Lollipop_Low_end_Tester/src
https://build.chromium.org/p/chromium.android/builders/Lollipop%20Low-end%20Tester/builds/3800/steps/content_browsertests/logs/stdio

The step is green regardless, but should probably be fixed anyway