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This patch changes the approximate scale math to use rect bounds instead
of a vector, which yields more accurate results.

This means that if a layer is effectively shrunk after the transformation
we won't use a larger scale which could have been the case with the
scale math.

R=chrishtr@chromium.org

Bug: 766021
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I42aea3e7b9900b2a1e5499c8c24d7264b7bd6d3f
Reviewed-on: https://chromium-review.googlesource.com/693303
Commit-Queue: vmpstr <vmpstr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506489}