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Though ComputeTranslation should result in a translation transform, we
can end up with non-translation transforms when we have noisy transforms.

BUG=639203
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2271273003
Cr-Commit-Position: refs/heads/master@{#414227}