Add drop shadows.

Change-Id: Ic6a72409d4785968d1fbdff229f17ee5c00b240b
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index 1efe6b5..8ed3d7b 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -17,7 +17,8 @@
 		ProgramCache.cpp \
 		SkiaColorFilter.cpp \
 		SkiaShader.cpp \
-		TextureCache.cpp
+		TextureCache.cpp \
+		TextDropShadowCache.cpp
 	
 	LOCAL_C_INCLUDES += \
 		$(JNI_H_INCLUDE) \