Adding RegisterDependantFieldTrial interface method.

components/sync/protocol/proto_visitors.h

Index: components/sync/protocol/proto_visitors.h
diff --git a/components/sync/protocol/proto_visitors.h b/components/sync/protocol/proto_visitors.h
index 31b343b39645d0fd515994eb2d5198540686d3d6..4f9da7374f9c8cc583eda08b01441f3baf144ffb 100644
--- a/components/sync/protocol/proto_visitors.h
+++ b/components/sync/protocol/proto_visitors.h
@@ -472,6 +472,15 @@ VISIT_PROTO_FIELDS(const sync_pb::FaviconTrackingSpecifics& proto) {
   VISIT(is_bookmarked);
 }
 
+VISIT_PROTO_FIELDS(const sync_pb::FieldTrialEvent::FieldTrial& proto) {
+  VISIT(name_id);
+  VISIT(group_id);
+}
+
+VISIT_PROTO_FIELDS(const sync_pb::FieldTrialEvent& proto) {
+  VISIT_REP(field_trials);
+}
+
 VISIT_PROTO_FIELDS(const sync_pb::GcmChannelFlags& proto) {
   VISIT(enabled);
 }
@@ -851,6 +860,7 @@ VISIT_PROTO_FIELDS(const sync_pb::UserEventSpecifics& proto) {
   VISIT(event_time_usec);
   VISIT(navigation_id);
   VISIT(session_id);
+  VISIT(field_trial_event);
 }
 
 VISIT_PROTO_FIELDS(const sync_pb::WalletMaskedCreditCard& proto) {