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getTilesPerRow_() only checked the grid's maximum number of tiles per
row when detecting if the tiles needed to be rebalanced. Therefore, if
the window's maximum tiles per row was less, the tiles were not
rebalanced.

Use the lesser of the two maximums when detecting if the tiles need to
be rebalanced.

Screencast: https://drive.google.com/open?id=19amLd8JRyzLSzBeA4Ypt7PIZYlaqhaIz

Bug: 961203
Change-Id: I3200a043b40b3282a61a7512e00e6b6ae4ebbd15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1603209
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658367}