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This CL implements primary (aka middle click) selection in Wayland.

R=dcheng@chromium.org, kylechar@chromium.org, msisov@igalia.com
TBR=oshima@chromium.org, dcastagna@chromium.org

Bug: 921950
Change-Id: I4aa02ffbd34541979e30dcefdecc9087d7c949c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795825Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/master@{#701927}