sync: Report GetUpdate triggers to the server

sync/engine/syncer_proto_util.cc

Index: sync/engine/syncer_proto_util.cc
diff --git a/sync/engine/syncer_proto_util.cc b/sync/engine/syncer_proto_util.cc
index 3b72c173470293666cee65aab599931c492ea867..721d0de7821e47f1383f3d64d7e15ee103b294a5 100644
--- a/sync/engine/syncer_proto_util.cc
+++ b/sync/engine/syncer_proto_util.cc
@@ -435,6 +435,11 @@ SyncerError SyncerProtoUtil::PostClientToServerMessage(
           base::TimeDelta::FromSeconds(
               command.sessions_commit_delay_seconds()));
     }
+
+    if (command.has_client_invalidation_hint_buffer_size()) {
+      session->delegate()->OnReceivedClientInvalidationHintBufferSize(
+          command.client_invalidation_hint_buffer_size());
+    }
   }
 
   // Now do any special handling for the error type and decide on the return