D27788: Implement EGL_KHR_partial_update and EGL_EXT_swap_buffers_with_damage

[Aleix Pol Gonzalez]

apol added inline comments.

INLINE COMMENTS

> zzag wrote in scene.cpp:144-146
> Urgh, this paintBackground() may render something to the back buffer before eglSetDamageRegionKHR() is called.

Tried adding an `aboutToStartPainting` call here but it errors out constantly.

Also expose effects work just fine as is.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D27788

To: apol, #kwin, #plasma:_mobile
Cc: mwolff, zzag, davidedmundson, kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, 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
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