update from tiling branch

169474[tip][tiling]   12d1b83f6aca   2014-02-26 20:12 +0100   nical
  Rename BasicTiledLayerBuffer into ClientTiledLayerBuffer
simple tiling
FIXUP: merge issues with tiling branch
configure some things using prefs -- layers.simple-tiles
imported patch from bug 959089, separate graphic buffer allocation
Add kitkat fixups and logging
add settings listeners for restart and friends
FIXME compilation issue in webrtc video
fullyDone work
Add Mutex to GrallocBufferManager
rename to TexturedTileDescriptor