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This CL allows the holding space bubble to dynamically
add / remove items and resize as required when that
happens.

Bug: 1129321

Change-Id: I8b072de15628ca0fc56f23d6286026b0f6aeda69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412639
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@{#809164}