Improve DisplayList state output

bug:17991451

Log hardware layers and shadow casting

Change-Id: I2ae40f270d18f5b2a5af985513e0f5e8841216c2
diff --git a/libs/hwui/RenderProperties.h b/libs/hwui/RenderProperties.h
index b936d4b..31c4f22 100644
--- a/libs/hwui/RenderProperties.h
+++ b/libs/hwui/RenderProperties.h
@@ -570,7 +570,7 @@
     }
 
     bool hasShadow() const {
-        return getZ() >= 0.0f
+        return getZ() > 0.0f
                 && getOutline().getPath() != NULL
                 && getOutline().getAlpha() != 0.0f;
     }