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This is a reland of e3dd922b

This was reverted in https://crrev.com/c/2600318

Original change's description:
> Implement skeleton of emoji_picker using Polymer.
>
> Very basic skeleton of the interface with search box and list of
> emoji. Currently draws emoji into groups from the emoji_ordering.json
> file. There is also a row of icons (currently not rendering).
>
> Some changes to BUILD.gn have been made to build the components
> using Polymer. This allows us to write template in html and have them
> imported into the js component code (see `__html_template__` placeholders)
>
> Bug: 1152237
> Change-Id: Ie7f803ba8c2f45d136e81ae2f6b0dd95d616fd27
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591988
> Commit-Queue: Kenton Lam <kentonlam@google.com>
> Reviewed-by: Keith Lee <keithlee@chromium.org>
> Reviewed-by: John Palmer <jopalmer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#837808}

Bug: 1161061,1152237
Change-Id: Ifd12ba0cc53f14a3363451dd80abcb6571ce5e2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2607982Reviewed-by: John Palmer <jopalmer@chromium.org>
Commit-Queue: Kenton Lam <kentonlam@google.com>
Cr-Commit-Position: refs/heads/master@{#840459}