Chrome Version       : 65.0.3315.3
OS Version: 10.0
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari:
    Firefox:
    IE/Edge:

What steps will reproduce the problem?
1. Install Chrome Remote Desktop.
2. Login from somewhere else.

What is the expected result?
Screen does not show on local display.

What happens instead of that?
Screen totally shows on local display.

Enabling curtain mode requires going to a support page (https://support.google.com/chrome/a/answer/2799701?hl=en), manually creating the regkeys in question, and hoping you don't make any typos. Since we already have a local host binary, shouldn't it be easy to have a helper to automatically configure these keys if you do want to enable curtain mode?