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This patch allows users of the BottomSheetContent api to choose the
height that their feature peeks at. Supplementing this change are
a number of height modes that the new getPeekHeight can return; namely
DEFAULT and DISABLED. These changes roll two existing methods into
a single, generic one.

All users of the api have been updated and tests have been added
for the new functionality.

Bug: 986310, 968246, 1012231, 1006029
Change-Id: Ia4b4c2c2839909c3c8f9da39b1b35283dd47eb9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832603
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705149}