I'd like to add that UX has made the decision to only have 1 snap point for the Zine NTP, so don't need the intermediary snap to ML. I don't think this was widely advertised.

Comment from Rachel: In the case where there aren't enough snippets to fully transition the top bar, we should probably add some more background at the bottom. There should be a shadow on the bottom edge of the card as well.  

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e4a2b825f7517623ae026660f81ce96eb965d46f

commit e4a2b825f7517623ae026660f81ce96eb965d46f
Author: peconn <peconn@chromium.org>
Date: Mon Apr 18 09:44:54 2016

Implement snap scrolling for Zine NTP.

Use absolute coordinates to smooth scroll to either the top of the NTP or to the top of the articles view.

Additionally, removed NewTabPageRecyclerView.OnScrollListener and related functionality, since NewTabPageRecyclerView inherits that behaviour from RecyclerView.

BUG= 596416 

Review URL: https://codereview.chromium.org/1884883004

Cr-Commit-Position: refs/heads/master@{#387880}

[modify] https://crrev.com/e4a2b825f7517623ae026660f81ce96eb965d46f/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageView.java
[modify] https://crrev.com/e4a2b825f7517623ae026660f81ce96eb965d46f/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageRecyclerView.java