frameworks/native: Propagate dirty region in hwc_layer

This change propagates dirty rect value of each layer down to HWC
in hwc_layer structure.

Change-Id: I91d87facf4a321b92539de5353faf09b553d4919

Conflicts:
	libs/gui/GLConsumer.cpp
	libs/gui/Surface.cpp
	services/surfaceflinger/Layer.cpp
	services/surfaceflinger/Layer.h