android_cronet_tester have been red for the past few builds.

https://build.chromium.org/p/tryserver.chromium.android/builders/android_cronet_tester

Sample build:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_cronet_tester/builds/2347/steps/steps/logs/stdio

[W2017-11-06T12:52:54.635242-08:00 2857 0 client.go:295] RPC failed transiently. Will retry in 1s    {"error":"rpc error: code = 2 desc = Internal Server Error", "host":"logs.chromium.org", "method":"RegisterPrefix", "service":"logdog.Registration", "sleepTime":"1s"}
[W2017-11-06T12:52:58.482331-08:00 2857 0 client.go:295] RPC failed transiently. Will retry in 2s    {"error":"rpc error: code = 2 desc = Internal Server Error", "host":"logs.chromium.org", "method":"RegisterPrefix", "service":"logdog.Registration", "sleepTime":"2s"}
[W2017-11-06T12:53:00.848158-08:00 2857 0 client.go:295] RPC failed transiently. Will retry in 4s    {"error":"rpc error: code = 2 desc = Internal Server Error", "host":"logs.chromium.org", "method":"RegisterPrefix", "service":"logdog.Registration", "sleepTime":"4s"}
[W2017-11-06T12:53:08.173536-08:00 2857 0 client.go:295] RPC failed transiently. Will retry in 8s    {"error":"rpc error: code = 2 desc = Internal Server Error", "host":"logs.chromium.org", "method":"RegisterPrefix", "service":"logdog.Registration", "sleepTime":"8s"}
[W2017-11-06T12:53:16.289320-08:00 2857 0 client.go:295] RPC failed transiently. Will retry in 16s   {"error":"rpc error: code = 2 desc = Internal Server Error", "host":"logs.chromium.org", "method":"RegisterPrefix", "service":"logdog.Registration", "sleepTime":"16s"}
[W2017-11-06T12:53:34.476036-08:00 2857 0 client.go:303] RPC failed permanently: rpc error: code = 2 desc = Internal Server Error {"error":"rpc error: code = 2 desc = Internal Server Error", "host":"logs.chromium.org", "method":"RegisterPrefix", "service":"logdog.Registration"}
[E2017-11-06T12:53:34.476102-08:00 2857 0 output.go:143] Failed to register prefix with Coordinator service. {"error":"rpc error: code = 2 desc = Internal Server Error"}
[E2017-11-06T12:53:34.476152-08:00 2857 0 subcommand_run.go:284] Failed to create output instance.           {"error":"rpc error: code = 2 desc = Internal Server Error"}
[I2017-11-06T12:53:34.476485-08:00 2857 0 main.go:349] Terminating.                                {"returnCode":250}
Traceback (most recent call last):
  File "../../../scripts/slave/annotated_run.py", line 458, in <module>
    sys.exit(shell_main(sys.argv))
  File "../../../scripts/slave/annotated_run.py", line 453, in shell_main
    return main(argv[1:])
  File "../../../scripts/slave/annotated_run.py", line 445, in main
    return _exec_recipe(rt, opts, stream, basedir, tdir, properties)
  File "../../../scripts/slave/annotated_run.py", line 359, in _exec_recipe
    recipe_return_code = bs.get_result()
  File "/b/build/scripts/slave/logdog_bootstrap.py", line 652, in get_result
    self._bootstrap_result_path, e))
slave.logdog_bootstrap.BootstrapError: Failed to open bootstrap result file [/b/build/slave/android_cronet_tester/.recipe_runtime/tmpjeCkyz/bootstrap_result.json]: [Errno 2] No such file or directory: '/b/build/slave/android_cronet_tester/.recipe_runtime/tmpjeCkyz/bootstrap_result.json'
program finished with exit code 1