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This is a follow-up to CL https://crrev.com/c/1709966.

Use the new widget's init properties to mark windows ignored in
mini_views before they're added to the containers. This enables
Desks to detect that it shouldn't bother updating the mini_views
with these windows, which won't mirror there in the first place.

BUG=979434, 866622
TEST=Added a new test.

Change-Id: I8e104572a5573b6dd99110440523be1ee65806d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731671
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683258}