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Added test coverage, noticed we need to have a gesture of atleast
6px for us to register a ui::ET_GESTURE_SCROLL_UPDATE, which is
required for us to move the hotseat.

Change-Id: I73020cda89ab252fc5d7497ac9eccd1fb5e7f232
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1870051
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708019}