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This CL changes enter/existing overview gesture.

Old gesture:
Scroll Down with 3 fingers -> Enter Overview
Scroll Up with 3 fingers -> Exit Overview

New gesture:
Scroll Up with 3 fingers -> Enter Overview
Scroll Down with 3 fingers -> Exit Overview

Note that the previous comment, "Handles vertical 3-finger scroll
gesture by entering overview on scrolling up, and exiting it on
scrolling down." is wrong.

Bug: 1107183
Change-Id: I01dd86ec5323939a38c7be2a44a7f3934b0f750d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419385Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Xiaodan Zhu <zxdan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809059}