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This CL changes the separator displayed on the iPad NTP. Instead of
being always visible the separator is now fade in when the fake
omnibox is reaching the real omnibox.

Bug: 968520
Change-Id: I5421094499a57d023d1a5c533bab68a4a76b6e95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643570
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665937}