Better cache for layers, reduce memory usage and increase framerate.

Change-Id: I5ff864a361db4791bd5ff6be716f7ce692ef572d
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index 43af702..437a9ef 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -5,6 +5,7 @@
 # defined in the current device/board configuration
 ifeq ($(USE_OPENGL_RENDERER),true)
 	LOCAL_SRC_FILES:= \
+		utils/SortedListImpl.cpp \
 		DisplayListRenderer.cpp \
 		FboCache.cpp \
 		FontRenderer.cpp \