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This CL adds the number of unread items in the ReadingList to the badge
associated with the ReadingList entry in the tools menu.

Bug: 826304
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Id806406c1e1452793092afdefeb6937051e9bdaf
Reviewed-on: https://chromium-review.googlesource.com/992233
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548024}