GitLab

Add a new "highlighter" tool using the same fast
rendering method as laser pointer (CL extracting
the common base class is to follow).

Bug: b:63142451
Change-Id: Id848b77f08ae95c167c527a07aec6ccdf79f49f4
Reviewed-on: https://chromium-review.googlesource.com/558467
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488688}