Add region-tracking to OffscreenBuffers

Change-Id: I024c7219c080b9a89888517f5a89d49dfe8065ba
diff --git a/libs/hwui/renderstate/MeshState.h b/libs/hwui/renderstate/MeshState.h
index e80f4d0..6c0fb78 100644
--- a/libs/hwui/renderstate/MeshState.h
+++ b/libs/hwui/renderstate/MeshState.h
@@ -75,6 +75,9 @@
      */
     bool unbindMeshBuffer();
 
+    void genOrUpdateMeshBuffer(GLuint* buffer, GLsizeiptr size, const void* data, GLenum usage);
+    void deleteMeshBuffer(GLuint);
+
     ///////////////////////////////////////////////////////////////////////////////
     // Vertices
     ///////////////////////////////////////////////////////////////////////////////