GitLab

Adds two new experimental settings to help manual testing of CBCM on
iOS:

1) EnableChromeBrowserCloudManagement to force enable CBCM infra
2) CloudManagementEnrollmentToken to provide an enrollment token

This change also creates a new "Enterprise Settings" section in the
experimental settings, since there are now three Enterprise-related
experimental settings.

Bug: 1066495
Change-Id: I8b88c408c5866cb130373712af6201269be39c36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353394
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797731}