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Copied over from languages_page/edit_dictionary_page.js
One change: use computed property for hasWords_, for this to work
iron-list can't be under template dom-if. Empty iron-list should not
have too much impact on performance.

Mock: http://go/cros-lang-settings-ux-slide#slide=28
and http://go/cros-lang-settings-ux-slide#slide=31

No word view: http://screen/34mebiVZeEXru8k
With words view: http://screen/9mDdiNFpPv4avpu

Bug: 1113439
Change-Id: Ide9edc3cbd95f055fd50109d1a17973152b3076e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2395903
Commit-Queue: My Nguyen <myy@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806523}