Forward-port surface dithering from CM10

This allows the use of 16-bit color displays without excessive color
banding; behavior can be controlled by the persist.sys.use_dithering
property.

Incorporates http://review.cyanogenmod.org/19532 from CM10 as well as
code removed in upstream commit 1b03149.

Change-Id: I290ca4ed4787dc81ac756d9af92cd6a690865a08
DisplayDevice: initialize mDisplayToken correctly

mDisplayToken should be initialized by displayToken.

Change-Id: I0a5fec1f1732200a32d10b1575239dceffe6dee4
Gfx-3d: fix GetProcAddress in egl extention

This patch can fix issue when Proc address return NULL.
Glbench10, egl-ext and conformance test need this patch to run pass.

Change-Id: I275c7cb6f77cb334c3ee7fa23cd696bba1c5a458
Author: Liuhui Lu <liuhui.lu@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 52622