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The launch of WebUI NTP depends on an effort that has begun that
will allow WebUI pages to use <iframe>'s. The embedded <iframe>
content will be site-isolated from the embedder if the embedder is a
WebUI page. The parts of the page that depend on this are the
OneGoogleBar, doodle, voice search and promo.

I plan to work on tasks that do not depend on embedding isolated
content.

 - Create placeholder WebUI page
 - Create parts of the page
   * search box
   * shortcuts and most-visited sites
   * customization
   * search suggestion chips (if still relevant after zero-suggest)
 - Flag that uses chrome://new-tab-page in place of
   chrome-search://local-ntp/local-ntp.html

Bug: 997229
Change-Id: I333588a379193d9fe6c542eaed589ff2e6cb4f52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769054
Commit-Queue: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716428}