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If the fling update is close to the final state, then stop the fling. The
threshold for this used to be 1e-5f, but change it to 1e-1f, since there
won't be any visual changes for subsequent fling-update steps.

BUG=none
R=jdduke@chromium.org

Review URL: https://codereview.chromium.org/606093002

Cr-Commit-Position: refs/heads/master@{#297198}