GitLab

* Created SearchHandler wrapper.
* Copied an ethernet svg from Polymer's iron-icons into os_icons.html.
* Copied a settings svg from Polymer's iron-icons into os_icons.html
  for general use.
* Add icons support for the 3 available mojo result icon types.
* Add arrow forward icon on the RHS.
* CSS alignments.

Screenshots:
https://screenshot.googleplex.com/7dMbgYnp6vA (real results)
https://screenshot.googleplex.com/aQH3hpPVXqj (fake)
https://screenshot.googleplex.com/Bu8xZnk7bN6 (focus on entire row)
https://screenshot.googleplex.com/sQzcVgZLHqd (narrow mode)

Bug: 1056909
Change-Id: I1bdeba2685ae80684b4aae6ddb347071f303e2f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131013
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756068}