D18810: [plugins/platforms/hwcomposer] Add scaling support

davidedmundson created this revision.
davidedmundson added a reviewer: KWin.
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REVISION SUMMARY
  Despite plasma frameworks doing it's own scaling with fonts, it's been
  requested to use kwin/wayland scaling.
  
  Scale value is based off an environment variable as plasma-mobile
  doesn't support kscreen and typically hwcomposer usage will be in a
  static deployment.

TEST PLAN
  Ran without the env, nothing broke
  Added to kwinwrapper, everything was the right size

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18810

AFFECTED FILES
  plugins/platforms/hwcomposer/egl_hwcomposer_backend.cpp
  plugins/platforms/hwcomposer/hwcomposer_backend.cpp
  plugins/platforms/hwcomposer/hwcomposer_backend.h

To: davidedmundson, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart