Start replicating sandbox flags for OOPIF

content/public/test/mock_render_thread.cc

Index: content/public/test/mock_render_thread.cc
diff --git a/content/public/test/mock_render_thread.cc b/content/public/test/mock_render_thread.cc
index cdd96b8a091374e9488d041ee39d71a0508bee27..e448e4fa4370db1276e285206834d49b501cab34 100644
--- a/content/public/test/mock_render_thread.cc
+++ b/content/public/test/mock_render_thread.cc
@@ -227,6 +227,7 @@ void MockRenderThread::OnCreateWindow(
 // The Frame expects to be returned a valid route_id different from its own.
 void MockRenderThread::OnCreateChildFrame(int new_frame_routing_id,
                                           const std::string& frame_name,
+                                          SandboxFlags sandbox_flags,
                                           int* new_render_frame_id) {
   *new_render_frame_id = new_frame_routing_id_++;
 }