D26974: [wayland] Get rid of some duplicated code

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REVISION SUMMARY
  We duplicate ping code in a few places. This change introduces a dedicated
  method for sending ping events to an xdg-toplevel. In long term, it can be
  used for sending "test" ping messages at random interval.

REPOSITORY
  R108 KWin

BRANCH
  introduce-ping-method

REVISION DETAIL
  https://phabricator.kde.org/D26974

AFFECTED FILES
  xdgshellclient.cpp
  xdgshellclient.h

To: zzag, #kwin
Cc: kwin, Orage, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart