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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.

Bug: 1131268
Change-Id: If09810570e59f7beeac0667e84d4cd558ee67bc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427081
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@{#810423}