[Merge] lp:~boiko/dialer-app/rtm-qsg_optimizations into lp:dialer-app/rtm-14.09

[Gustavo Pichorim Boiko]

Gustavo Pichorim Boiko has proposed merging lp:~boiko/dialer-app/rtm-qsg_optimizations into lp:dialer-app/rtm-14.09.

Commit message:
Do some basic QSceneGraph rendering optimizations.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1392400 in dialer-app: "Avoid overdraws and batch breaking"
  https://bugs.launchpad.net/dialer-app/+bug/1392400

For more details, see:
https://code.launchpad.net/~boiko/dialer-app/rtm-qsg_optimizations/+merge/247166

Do some basic QSceneGraph rendering optimizations.
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~boiko/dialer-app/rtm-qsg_optimizations into lp:dialer-app/rtm-14.09.
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