The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bb5e75574b94d73eb19209adad14d8d810fb7f98

commit bb5e75574b94d73eb19209adad14d8d810fb7f98
Author: hctsai <hctsai@google.com>
Date: Thu Sep 01 09:37:31 2016

Show all system process in the task_manager.

BUG= 623508 

Review-Url: https://codereview.chromium.org/2025593003
Cr-Commit-Position: refs/heads/master@{#415918}

[modify] https://crrev.com/bb5e75574b94d73eb19209adad14d8d810fb7f98/chrome/browser/chromeos/arc/arc_process_service.cc
[modify] https://crrev.com/bb5e75574b94d73eb19209adad14d8d810fb7f98/chrome/browser/chromeos/arc/arc_process_service.h
[modify] https://crrev.com/bb5e75574b94d73eb19209adad14d8d810fb7f98/chrome/browser/memory/tab_manager_delegate_chromeos.cc
[modify] https://crrev.com/bb5e75574b94d73eb19209adad14d8d810fb7f98/chrome/browser/task_manager/providers/arc/arc_process_task_provider.cc
[modify] https://crrev.com/bb5e75574b94d73eb19209adad14d8d810fb7f98/chrome/browser/task_manager/providers/arc/arc_process_task_provider.h

My understanding is that this was fixed.