Fix 9patch rendering in ExpandableListView.

Change-Id: I60843d61a40b0cb7dd09923cb4489a5a76f20486
diff --git a/libs/hwui/Patch.h b/libs/hwui/Patch.h
index 0f0ffa2..45ce998 100644
--- a/libs/hwui/Patch.h
+++ b/libs/hwui/Patch.h
@@ -71,7 +71,7 @@
     void generateRow(TextureVertex*& vertex, float y1, float y2,
             float v1, float v2, float stretchX, float width, float bitmapWidth,
             uint32_t& quadCount);
-    void generateQuad(TextureVertex*& vertex,
+    bool generateQuad(TextureVertex*& vertex,
             float x1, float y1, float x2, float y2,
             float u1, float v1, float u2, float v2,
             uint32_t& quadCount);