Add region-tracking to OffscreenBuffers

Change-Id: I024c7219c080b9a89888517f5a89d49dfe8065ba
diff --git a/libs/hwui/GlopBuilder.h b/libs/hwui/GlopBuilder.h
index 6f5802e..6270dcb 100644
--- a/libs/hwui/GlopBuilder.h
+++ b/libs/hwui/GlopBuilder.h
@@ -47,6 +47,7 @@
 public:
     GlopBuilder(RenderState& renderState, Caches& caches, Glop* outGlop);
 
+    GlopBuilder& setMeshTexturedIndexedVbo(GLuint vbo, GLsizei elementCount);
     GlopBuilder& setMeshUnitQuad();
     GlopBuilder& setMeshTexturedUnitQuad(const UvMapper* uvMapper);
     GlopBuilder& setMeshTexturedUvQuad(const UvMapper* uvMapper, const Rect uvs);