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The top shadow drawable for bottom sheet consists of 3 parts
vertically - round-cornered view, shadow, and an empty space at the
top. In order to remove the gap between bottom sheet and infobar (or
any other view bottom container), the infobar needs to be lowered down
by the height of shadow plus that of the empty space. This CL defines
a new constant |bottom_sheet_shadow_top_offset| for the space, and
applies it to bottom container.

Bug: 1025098, 1030251
Change-Id: Ic145e861fcc5f1639196f6b96d3bfe3208fc0581
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948367
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721775}