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|device_scale_factor_| is a float and was incorrectly passed as an int
to CanSplitQuad.
This would cause rounding down the device scale factor and incorrectly
computing the number of fragments we are saving.

Bug: 1022544
Test: viz_unittests --gtest_filter="*DrawOcclusionSplitDeviceScaleFactor*"

Change-Id: I084cb9ce52116b0d37e18ff74dd06233978cb9a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2072625
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Gil Dekel <gildekel@chromium.org>
Reviewed-by: Sasha McIntosh <sashamcintosh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745520}