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With this change when scroll-to-hide is enabled in the JITT UI,
scrolling down on the browser page hides the bottom sheet and scrolling
up reveals it again.

Change-Id: I92f9753b09d25443293e5a1b4cb23bc8c3cfb3d3
Bug: b/171792266
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599864
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#842475}