Bug 815591. Disable failing reftests that need the fix for bug 828146 (that doesn't affect B2G). a=bajaj
Bug 846144 - Don't optimize backgrounds to an ImageLayer if they have border-radius clipping. r=roc,a=akeybl
Bug 815591. Don't build nsDisplayBackgroundColor if there is no background color and we're not going to do hit-testing. r=mattwoodrow,a=akeybl