Add return values to SyncerCommand

chrome/browser/sync/engine/build_commit_command.cc

Index: chrome/browser/sync/engine/build_commit_command.cc
diff --git a/chrome/browser/sync/engine/build_commit_command.cc b/chrome/browser/sync/engine/build_commit_command.cc
index 35ff047afc5be25930bafd8322484c264c496f2d..331c6ae2e8e95ad0f0dadccf078f94dd21465ce3 100644
--- a/chrome/browser/sync/engine/build_commit_command.cc
+++ b/chrome/browser/sync/engine/build_commit_command.cc
@@ -85,7 +85,7 @@ void SetEntrySpecifics(MutableEntry* meta_entry, SyncEntity* sync_entry) {
 }
 }  // namespace
 
-void BuildCommitCommand::ExecuteImpl(SyncSession* session) {
+SyncerError BuildCommitCommand::ExecuteImpl(SyncSession* session) {
   ClientToServerMessage message;
   message.set_share(session->context()->account_name());
   message.set_message_contents(ClientToServerMessage::COMMIT);
@@ -210,6 +210,8 @@ void BuildCommitCommand::ExecuteImpl(SyncSession* session) {
   }
   session->mutable_status_controller()->
       mutable_commit_message()->CopyFrom(message);
+
+  return NO_ERROR;
 }
 
 int64 BuildCommitCommand::FindAnchorPosition(syncable::IdField direction,