Property support for light positioning.

Tune up the light size to make it look better.

Change-Id: I139a05f3dd53dacbe55759b91188f0e1cc2c7f80
diff --git a/libs/hwui/ShadowTessellator.h b/libs/hwui/ShadowTessellator.h
index 44ac8c0..2399f8f 100644
--- a/libs/hwui/ShadowTessellator.h
+++ b/libs/hwui/ShadowTessellator.h
@@ -30,8 +30,9 @@
             const mat4& casterTransform, VertexBuffer& shadowVertexBuffer);
 
     static void tessellateSpotShadow(float width, float height,
-            const mat4& receiverTransform, int screenWidth, int screenHeight,
-            const mat4& casterTransform, VertexBuffer& shadowVertexBuffer);
+            const Vector3& lightPosScale, const mat4& receiverTransform,
+            int screenWidth, int screenHeight, const mat4& casterTransform,
+            VertexBuffer& shadowVertexBuffer);
 
 private:
     static void generateCasterPolygon(float width, float height,