Forward-port surface dithering from CM10.2

This allows the use of 16-bit color displays without excessive color
banding;

Change-Id: Icb469b9cb4beb686516c60bb576dbd0a73f505e0
installd: Invert the default for dexopt-on-cache

The growth of /system apps and total /data space are making this
device-breaking (insufficient space to dexopt everything to
/cache), pointless (/data has more than enough room to hold
the cache), and in some cases, both.
The default behavior is now the same as mainline Android's: dexopt
everything to /data. Set dalvik.vm.dexopt-data-only=0 to change
that and dexopt /system apps to /cache. If you do that, make sure
your /cache can accomodate double the size of the dex classes in
system, since in some extreme cases that has been observed during
dex2oat

Change-Id: I8c793784af1fa804ccf84b442613d1000c9b7ce4
Update HWUI config for xxhdpi/2GB devices

Change-Id: Ic9ba16b0360f2b755a1d23aa51eddc61beee2bac