fix perf compilation

ethcore/src/test_helpers/test_client.rs

@@ -81,6 +81,7 @@ use spec::{Spec, self};
 use account_state::state::StateInfo;
 use state_db::StateDB;
 use trace::LocalizedTrace;
+use stats::{PrometheusMetrics,prometheus};
 
 /// Test client.
 pub struct TestBlockChainClient {
@@ -995,3 +996,8 @@ impl client_traits::EngineClient for TestBlockChainClient {
 		BlockChainClient::block_header(self, id)
 	}
 }
+
+impl PrometheusMetrics for TestBlockChainClient {
+	fn prometheus_metrics(&self, r: &mut prometheus::Registry) {
+	}
+}

rpc/src/v1/tests/helpers/sync_provider.rs

@@ -22,6 +22,7 @@ use parking_lot::RwLock;
 use network::client_version::ClientVersion;
 use futures::sync::mpsc;
 use sync::{SyncProvider, EthProtocolInfo, SyncStatus, PeerInfo, TransactionStats, SyncState};
+use stats::{PrometheusMetrics,prometheus};
 
 /// TestSyncProvider config.
 pub struct Config {
@@ -72,6 +73,11 @@ impl TestSyncProvider {
 	}
 }
 
+impl PrometheusMetrics for TestSyncProvider {
+	fn prometheus_metrics(&self, r: &mut prometheus::Registry) {
+	}
+}
+
 impl SyncProvider for TestSyncProvider {
 	fn status(&self) -> SyncStatus {
 		self.status.read().clone()