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In order to prevent private information from being leaked to third-
party NTPs, information related to editing/adding links will be
contained in an iframe. Once the user finishes editing, the information
will be sent to the EmbeddedSearchAPI and ultimately be received by the
Most Visited iframe by querying EmbeddedSearchAPI with the specified
rid.

Screenshot: https://screenshot.googleplex.com/FcYM4VCiu3c.png

Design Doc: go/chrome-ntp-custom-links

Bug: 851293, 865071
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I06f4449f9c3764c5d797b83acbc7c97e6903b787
Reviewed-on: https://chromium-review.googlesource.com/1139108Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576348}