Ignore empty layers.

Change-Id: Ib2f99cdab654881fe079306e27d87c5ef9535700
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index 8bfc8d4..17b9e83 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -385,11 +385,7 @@
 
     if (bounds.isEmpty() || bounds.getWidth() > mCaches.maxTextureSize ||
             bounds.getHeight() > mCaches.maxTextureSize) {
-        if (fboLayer) {
-            snapshot->invisible = true;
-        } else {
-            snapshot->empty = true;
-        }
+        snapshot->empty = fboLayer;
     } else {
         snapshot->invisible = snapshot->invisible || (alpha <= ALPHA_THRESHOLD && fboLayer);
     }