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Modified based on the new spec:
A window has to be dragged toward the direction of the edge of the
screen for a minimum of 96dp to a point within 48dp of the edge of
the screen, or dragged inside 8dp from edge to be snapped.

Bug: 1021294
Change-Id: I2d79854b37bfdf36bcd5319a856b874233159982
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037825Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738444}