Round the snapped position when checking snapped
Round the snapped position when checking snapped

so that it can handle negative errors (like 0.999)

BUG=None
R=danakj@chromium.org

Review URL: https://codereview.chromium.org/467813002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@289105 0039d316-1c4b-4281-b951-d872f2087c98

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