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The M87 changes the switching desk gesture direction when reverse
scrolling for touchpad is off. This CL flips gesture direction of
switching desks and show a toast when reverse scrolling is off.

Bug: 1107183
Change-Id: I58dc18331bc9f917a571b033b8caac63a3da95bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444438
Commit-Queue: Xiaodan Zhu <zxdan@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813265}