The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6caf2deb98f1cf37f5268eed152475016023a95a

commit 6caf2deb98f1cf37f5268eed152475016023a95a
Author: olivierrobin <olivierrobin@chromium.org>
Date: Wed Mar 22 09:27:57 2017

Reading List iOS: Handle multiple pages.

Set the origin_url when creating the distiller.
Only report mime_type and navigation on main page.

BUG= 702113 

Review-Url: https://codereview.chromium.org/2754803003
Cr-Commit-Position: refs/heads/master@{#458698}

[modify] https://crrev.com/6caf2deb98f1cf37f5268eed152475016023a95a/ios/chrome/browser/dom_distiller/distiller_viewer.cc
[modify] https://crrev.com/6caf2deb98f1cf37f5268eed152475016023a95a/ios/chrome/browser/reading_list/reading_list_distiller_page.h
[modify] https://crrev.com/6caf2deb98f1cf37f5268eed152475016023a95a/ios/chrome/browser/reading_list/reading_list_distiller_page.mm
[modify] https://crrev.com/6caf2deb98f1cf37f5268eed152475016023a95a/ios/chrome/browser/reading_list/reading_list_distiller_page_factory.h
[modify] https://crrev.com/6caf2deb98f1cf37f5268eed152475016023a95a/ios/chrome/browser/reading_list/reading_list_distiller_page_factory.mm
[modify] https://crrev.com/6caf2deb98f1cf37f5268eed152475016023a95a/ios/chrome/browser/reading_list/url_downloader.cc