Add ids to flatbuffer fields in y2012, y2016, frc971, and aos

Change-Id: I9ed9006ce6224e2df0459df47771786b928164a1
diff --git a/aos/network/message_bridge_client.fbs b/aos/network/message_bridge_client.fbs
index df3f02f..9dddd16 100644
--- a/aos/network/message_bridge_client.fbs
+++ b/aos/network/message_bridge_client.fbs
@@ -5,25 +5,25 @@
 // Statistics from a single client connection to a server.
 table ClientConnection {
   // The node that we are connected to.
-  node:Node;
+  node:Node (id: 0);
 
   // Health of this connection.  Connected or not?
-  state:State;
+  state:State (id: 1);
 
   // Number of packets received on all channels.
-  received_packets:uint;
+  received_packets:uint (id: 2);
 
   // This is the measured monotonic offset for just the server -> client
   // direction measured in nanoseconds.  Subtract this from our monotonic time
   // to get their monotonic time.
-  monotonic_offset:int64;
+  monotonic_offset:int64 (id: 3);
 
   // TODO(austin): Per channel counts?
 }
 
 // Statistics for all clients.
 table ClientStatistics {
-  connections:[ClientConnection];
+  connections:[ClientConnection] (id: 0);
 }
 
 root_type ClientStatistics;