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According to the mocks, Data Leak Protection toast should
contain a "managed" "building" icon on the left.
Adding this functionality to Toast as well as enforcing it
for DLP notifications.

See mocks: https://docs.google.com/presentation/d/1v0GM-lwHCznFJ6hnZlUH37eBOuAkJMw5Q6UnSkcKOgA/edit?hl=en#slide=id.g8f65759f6a_14_27

Bug: 1124651, 1096461
Change-Id: If815c55a3a9e011ea19f29b6cd95fb7aca2aeccc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435390
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Aya Elsayed <ayaelattar@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811998}