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This will make it possible to use it in Showcase. Both the buttonfactory
and the stackView of the BadgeViewController have to be initialized in
init in order for addBadge: to successfully add badges from a
Showcase coordinator.

Bug: 976901
Change-Id: I2a98150cbe64e3b407295224514da6220d393ec2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1755050
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687395}