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This class will own pinned_files_container and recent_files_container.
It will also be responsible for setting the max size for the pinned
files container based on available screen space and update it when
screen space changes.

The reland fixes a bug caused by removing GetBubbleView override
from holding_space_tray that broke browser tests.

Bug: 1131268
Change-Id: Ia0bf21261bb8f3b96f37366b04e1519dbe85c7a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432367
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: David Black <dmblack@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811104}