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This CL makes half/full state height of BottomSheet dynamic so that
the sheet can have both half/full state and keep the content
wrapped. Gesture navigation shows how it can be used as an example. By
overriding BottomSheetContent.getCustomized{Half,Full}Ratio:

 - The sheet expands to the half state with content wrapped. The height
   is maxed out at the half the container height.

 - If slided up, the content moves to the full state, the content
   still wrapped. The height is maxed out at the full container height,
   and the content becomes scrollable if necessary.

Bug: 993051
Change-Id: I7e000716ee6b544b541d385e34cae026d64798d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1781123
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696716}