SF: Reduce size of DisplayFrame according to "transparent region"

Calculating SourceCrop according to "transparent region" is taken care but
not DisplayFrame. DisplayFrame also need to be calculated according to
"transparent region" to avoid mismatch in SourceCrop and DisplayFrame.
This will avoid unwanted Scaling introduced because of mismatch.

CRs-Fixed: 651365
Change-Id: I33733c084702d46de1c9eb6663533fb083f9788a
Merge pull request #20 from CyanogenMod/cm-11.0

SF: Reduce size of DisplayFrame according to "transparent region"