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Display preferences for chrome OS stores the display zoom value only
upto a precision of 2 decimal point.

This patch adds a check of precision to ensure that in the future if
any changes are made to the way display zoom values are generated then
those changes keep in mind this precision that is used by display prefs.

Bug: 823922
Change-Id: I8370415041bcaeac55c4afef9a4e4125979559b4
Component: Display Util Test
Reviewed-on: https://chromium-review.googlesource.com/974264Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544897}