Made grpc_byte_buffer_reader able to decompress msgs.
diff --git a/include/grpc/byte_buffer_reader.h b/include/grpc/byte_buffer_reader.h
index cb757cf..3f186da 100644
--- a/include/grpc/byte_buffer_reader.h
+++ b/include/grpc/byte_buffer_reader.h
@@ -38,7 +38,8 @@
 #include <grpc/byte_buffer.h>
 
 struct grpc_byte_buffer_reader {
-  grpc_byte_buffer *buffer;
+  grpc_byte_buffer *buffer_in;
+  grpc_byte_buffer *buffer_out;
   /* Different current objects correspond to different types of byte buffers */
   union {
     /* Index into a slice buffer's array of slices */