GitLab

Reading list manager talks to reading list backend and converts data
to a BookmarkNode tree.

Bug: 1128074
Change-Id: I0a59530b667021e2aa0d58842a4c0495bfde7af5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427635Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811774}