Fix layer shader to store layer pointer

bug:19419672

Change-Id: I4277348ceab41fbf45a107a8b21f64e2b4af23e0
diff --git a/libs/hwui/SkiaShader.cpp b/libs/hwui/SkiaShader.cpp
index 81531e8..2fcf7f3 100644
--- a/libs/hwui/SkiaShader.cpp
+++ b/libs/hwui/SkiaShader.cpp
@@ -685,7 +685,7 @@
     }
 
     description->hasBitmap = true;
-
+    outData->layer = layer;
     outData->bitmapSampler = (*textureUnit)++;
 
     const float width = layer->getWidth();