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Implementation is stubbed out today, but still needed so that
BrowserNonClientFrameViewChromeOS can be adopted on lacros builds.

SnapControllerLacros inherits the pure virtual
chromeos::SnapController, and "maximizing" lacros chrome windows
require an instance to exist (held by ChromeBrowserMainExtraPartsViewsLacros).

Similarly to ash::SnapControllerImpl, SnapControllerLacros
is created from the newly added
ChromeBrowserMainExtraPartsViewsLacros::PreProfileInit().

BUG=1113900
R=jamescook@chromium.org

Change-Id: I86a034ddcba7c12c3a7d7b2736058476c2db3ba2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547045
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828976}