frameworks/base: Use hardware acceleration for selected applications (3/4)

hwui: Allow to blacklist android applications

Add support for a local config folder with blacklisted process names
/data/local/hwui.deny/<package name>

Only enabled with "hwui.use.blacklist=true"

This system can be used easily from adb shell, without reboot
or with a setting app, like the one i use, HwaSettings

Change-Id: I52359ffc4a3c356cf529106c19cebffadcaefe1a