Add stencil buffer to the EGL config

Change-Id: If76c0cd6127534d90f9526b75c0f8e56259c6722
diff --git a/libs/hwui/Properties.h b/libs/hwui/Properties.h
index 2eae0f1..71fb8da 100644
--- a/libs/hwui/Properties.h
+++ b/libs/hwui/Properties.h
@@ -37,6 +37,11 @@
 // Textures used by layers must have dimensions multiples of this number
 #define LAYER_SIZE 64
 
+// Defines the size in bits of the stencil buffer
+// Note: We only want 1 bit, but in practice we'll get 8 bits on all GPUs
+//       for the foreseeable future
+#define STENCIL_BUFFER_SIZE 0
+
 /**
  * Debug level for app developers.
  */