Store the distilled_url in Reading List entry in Reading List on iOS.

Store the distilled_url in Reading List entry in Reading List on iOS.

The URL of the distilled page is not necessarily the URL of the Reading
List entry (in case of redirection).
Store the URL of the page that was distilled in the database.
This CL adds the field in ReadingListEntry.
This field will be used in a next CL.

BUG=682666
Review-Url: https://codereview.chromium.org/2647763005
Cr-Commit-Position: refs/heads/master@{#445063}
(cherry picked from commit 695d0c65669b7af00f8daec96d497519c0e0cb46)

Review-Url: https://codereview.chromium.org/2648293002 .
Cr-Commit-Position: refs/branch-heads/2987@{#21}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/7a16a5ed6f3cc1d871b550ed0187695c0c6cba2c

[Olivier, 2017-01-23 15:21:24]

Description was changed from

==========
Store the distilled_url in Reading List entry in Reading List on iOS.

The URL of the distilled page is not necessarily the URL of the Reading
List entry (in case of redirection).
Store the URL of the page that was distilled in the database.
This CL adds the field in ReadingListEntry.
This field will be used in a next CL.

BUG=682666

Review-Url: https://codereview.chromium.org/2647763005
Cr-Commit-Position: refs/heads/master@{#445063}
(cherry picked from commit 695d0c65669b7af00f8daec96d497519c0e0cb46)
==========

to

==========
Store the distilled_url in Reading List entry in Reading List on iOS.

The URL of the distilled page is not necessarily the URL of the Reading
List entry (in case of redirection).
Store the URL of the page that was distilled in the database.
This CL adds the field in ReadingListEntry.
This field will be used in a next CL.

BUG=682666

Review-Url: https://codereview.chromium.org/2647763005
Cr-Commit-Position: refs/heads/master@{#445063}
(cherry picked from commit 695d0c65669b7af00f8daec96d497519c0e0cb46)

Review-Url: https://codereview.chromium.org/2648293002 .
Cr-Commit-Position: refs/branch-heads/2987@{#21}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/7a16a5ed6f3cc1d871b550ed0187...
==========

[Olivier, 2017-01-23 15:21:27]

Committed patchset #1 (id:1) manually as
7a16a5ed6f3cc1d871b550ed0187695c0c6cba2c.