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See video before change:
https://drive.google.com/file/d/0B5I0jFeLxqIiUlg2aXRrdGFIV0d0ZzhZYng4Y3VJQVJ1OXow/view?usp=sharing

The affordance is assumed to be 64dips above the touch point,but the
distance seems much further than expected.

See video after change:
https://drive.google.com/file/d/0B5I0jFeLxqIicGNacUIzUThxUHZ3SHV0RVBlWFpzdUNtb2h3/view?usp=sharing

Bug: 1002733
Change-Id: I4d5638a3c964fe45a52402f75c9ad21ba62a9bea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859690
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705993}