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Previously, opening a browser tab would cause Assistant UI to hide.
Now, we'll remain open but go into mini UI mode.

In mini UI mode, we'll show the active query (if there is one) in lieu
of the default prompt string. Stylus behavior remains unchanged.

This CL also adds an AssistantContainerLayout to serve as the layout
manager for AssistantContainerView. This was done to setup for
additional motion specs as well as to fix a crash.

See bug for demo.

Bug: b:112376466
Change-Id: Ia920f3c2509eb6f255d5eb6d508dfb650383773b
Reviewed-on: https://chromium-review.googlesource.com/1168654
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581972}