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Swiping a tab (in either direction, up or down) initially begins by
animating opacity from 0 to 1, and then animates the max-width to
0 to hide the space the TabElement takes in the tab strip. The tab
will only close if the user lets go of the pointer past this
max-width threshold or if the user swipes quick enough.

Bug: 1014679
Change-Id: I060876c1c2916cb69e964f39c18f72a4d379931f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888380
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712360}