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This will allow the icon insertion logic to be shared across different
implementations of the Reading List empty state.

Bug: 851962
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ibd4abe71be34ae019786620ba88ba6f226b75456
Reviewed-on: https://chromium-review.googlesource.com/1135983
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575017}