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This CL allows for the fake omnibox to stick to the top of the NTP when
scrolling through the page.

The width animation before sticking is handled by the
ContentSuggestionsLayout, as it was before. This layout will perform the
initial "stick" once the animation is over.

Once the user scrolls passed the ContentSuggestionsHeader, the fake
omnibox ownership is transferred to the Discover feed, so that it could
stick to the top of the NTP and receive tap actions.

Bug: 1114792
Change-Id: I15d5c32cba1aedfe0756b23c19a55f59d48806ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622314
Commit-Queue: Adam Trudeau-Arcaro <adamta@google.com>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842835}