Calculate and show the shadow from a spot light.

Change-Id: Ia558852e8cde5d33866b22875eb501e4c6858819
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index 4f0d15a..0fd01d4 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -42,6 +42,7 @@
 		SkiaColorFilter.cpp \
 		SkiaShader.cpp \
 		Snapshot.cpp \
+		SpotShadow.cpp \
 		StatefulBaseRenderer.cpp \
 		Stencil.cpp \
 		Texture.cpp \