Add estimator test
diff --git a/binding.gyp b/binding.gyp
index 397bb1b..d94f2fe 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -649,6 +649,7 @@
         'src/core/lib/surface/server.c',
         'src/core/lib/surface/validate_metadata.c',
         'src/core/lib/surface/version.c',
+        'src/core/lib/transport/bdp_estimator.c',
         'src/core/lib/transport/byte_stream.c',
         'src/core/lib/transport/connectivity_state.c',
         'src/core/lib/transport/mdstr_hash_table.c',