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This allows the text associated with the account icon in the toolbar to
elide when displaying the entire text would cause the omnibox to become
unusably small or force the kebab/wrench menu icon off the side of the
toolbar and out of view (see attached bug).

We also include some changes in view and label_button so that we don't
accidentally report a stale size. The change to caching only text size
is because that's the expensive part of the operation - the rest is
relatively simple math.

Bug: 1012681
Change-Id: I10db6848a317dfa120472b749bcd77762ce6f62b
Fixes: 1012681
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876128
Commit-Queue: Dana Fried <dfried@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Caroline Rising <corising@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709220}