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As an ongoing effort to make the window cycle list more interactive,
this CL makes it so users can select and confirm a selection by tapping
a preview item in the window cycle list.

Test: InteractiveWindowCycleControllerTest.TapSelect
Bug: 1067327
Change-Id: Ice8cbcfe0e1886a15169f50eaf3172e96acb03e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367497
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801625}