GitLab

The method called to show the dialog used to take 9 parameters and the
list was growing. This CL bundles the parameters into a separate contents
object which requires the mandatory values to be passed in the constructor
and offers reasonable defaults and setters for the rest of the values.

In addition, some properties of the model are not actually meant to be
changed on the fly, so they are now marked readonly and set before building
the model. This requires a separate initialization step in the coordinator
and mediator.

Bug: 1028947
Change-Id: I4f121e5fee88d095d6c31add59111639e85faedb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948931
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721576}