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Mac browser fullscreen mode allows to keep the top UI, as well as
toggling between showing and hiding the top UI. In these cases, bookmark
bar should always show or hide in sync with the top UI. This requires
tracking top UI change, and change bookmark bar state or visibility
accordingly.

In Views, bookmark bar state is cached in Browser::bookmark_bar_state_,
and is updated through Browser::UpdateBookmarkBarState(). So when the
visibility of top UI changes, we need to execute
UpdateBookmarkBarState() to update bookmark bar state as well.

BUG=831219
TEST=pls check bookmark bar (non-detached) in fullscreen mode, which
     should always show or hide along with toolbar/tabstrip.

Change-Id: I04475edc455a62e045857ed666c44a31ead2b402
Reviewed-on: https://chromium-review.googlesource.com/1109405
Commit-Queue: Wei Li <weili@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570324}