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For xdg-stable shell, this CL implements xdg-decoration protocol
handshake between exo-server and client. This implementation makes the
client and server to agree on decoration mode(CSD or SSD).

The class |WaylandXdgToplevelDecoration| added on the server-side to
maintain decoration state and communicate with the client. Current
changes in CL are not integrated with decoration attributes like
maximize and resize. Future CLs will add window decoration based on
decoration mode.

Bug: 1067535
Change-Id: I64980c1e71036e68750c909c1aad9f9b737fcd58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2330170
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Reviewed-by: Mitsuru Oshima (Slow: gardener) <oshima@chromium.org>
Reviewed-by: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#806448}