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Factor out painting logic for DecorationImage (#12646)

This avoids some code duplication that existed before and will make
further modifications easier.
I
Ian Hickson committed
faf44b592ab0f15bb8141e11c6e1c44f7d973c23
Parent: eb475bb
Committed by GitHub <noreply@github.com> on 10/20/2017, 11:58:16 PM