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Previously, when animating layout manager was set to "animate bounds"
mode (see SetShouldAnimateBounds()), it assumed it would always be given
enough space for its preferred size at any point in the animation.

This CL makes it so that an animation can stop short if the containing
view stops granting the animating view more space. This allows a view
with an AnimatingLayoutManager to be more easily embedded in a view that
has, for example, a FlexLayout layout manager.

The primary use case will be capping the size of the account icon
container so the account name text is elided when the browser window is
too narrow to show the entire text without making the Omnibox too small
to effectively use.

The current behavior is that when space runs out, the kebab/wrench icon
slides off the right side of the window (see attached bug).

A follow-up will actually engage this new functionality to fix the
problem.

Bug: 1012681
Change-Id: Ia8e41bb15776a72a8d0869a3c387703e5e443c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875107
Commit-Queue: Dana Fried <dfried@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709182}