imagedecoder: standalone JPEG decode lib

BZ: 135392

JPEG decode is now used by not only skia but also
other modules like usb camera. A standalone lib
wrapping VAAPI JPEG decoding is implemented for
their use.

Change-Id: I7fe07faacc810bd237f367b6149ca1cd35c9a773
Signed-off-by: Cheng Yao <yao.cheng@intel.com>
Reviewed-on: http://android.intel.com:8080/130405
Reviewed-by: Shi, PingX <pingx.shi@intel.com>
Tested-by: Shi, PingX <pingx.shi@intel.com>
Reviewed-by: cactus <cactus@intel.com>
Tested-by: cactus <cactus@intel.com>
20 files changed