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When this test was written it was assumed safe to use exact comparisons
for scale because it was expected that all the page scale factors would
be a power of 2. But Android test bots use arbitrary values that mean we
should use EXPECT_NEAR instead.

TBR=kenrb@chromium.org

Bug: 894561
Change-Id: Ia6f70f62ef993ef5bd2a7699a7fbb30c492c651d
Reviewed-on: https://chromium-review.googlesource.com/c/1277651Reviewed-by: James MacLean <wjmaclean@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598915}