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Transforming a surface's damage into its target space involves a bit of
floating point math. This can introduce small errors - for example,
scaling 1680x945 by .8 results in 1344.000122x756.000061. If we don't
ignore this error, the inflated enclosing rectangle can prevent overlay
optimizations from operating effectively.

Bug: 1113146
Change-Id: Ic08dd08180b054b2637e57ab68b1577214bec4d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2338277Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: David Stevens <stevensd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795304}