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This CL adds fade in/out animation for showing/hiding the clipboard
nudge. The nudge scales down when fading in and scales up in size when
fading out.

Bug: 1143809
Change-Id: I4c299c9c6264efcefdc6b9d35fd7a1563f8cb0ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511350
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824551}