Added batch GRPC_TRACE option to trace calls to grpc_call_start_batch
diff --git a/build.json b/build.json
index c9500eb..6650801 100644
--- a/build.json
+++ b/build.json
@@ -224,6 +224,7 @@
         "src/core/surface/byte_buffer_reader.c",
         "src/core/surface/call.c",
         "src/core/surface/call_details.c",
+        "src/core/surface/call_log_batch.c",
         "src/core/surface/channel.c",
         "src/core/surface/channel_create.c",
         "src/core/surface/client.c",