Expose SetDiscoveryFilter from BluetoothEventRouter

device/bluetooth/test/mock_bluetooth_adapter.cc

Index: device/bluetooth/test/mock_bluetooth_adapter.cc
diff --git a/device/bluetooth/test/mock_bluetooth_adapter.cc b/device/bluetooth/test/mock_bluetooth_adapter.cc
index 1ee00ee008671cdec8886d1a8769c4184a4fc300..a021bfd0a1821c9cf1b8632151abefd3afdb6217 100644
--- a/device/bluetooth/test/mock_bluetooth_adapter.cc
+++ b/device/bluetooth/test/mock_bluetooth_adapter.cc
@@ -41,4 +41,12 @@ void MockBluetoothAdapter::SetDiscoveryFilter(
     const ErrorCallback& error_callback) {
 }
 
+void MockBluetoothAdapter::StartDiscoverySessionWithFilter(
+    scoped_ptr<BluetoothDiscoveryFilter> discovery_filter,
+    const DiscoverySessionCallback& callback,
+    const ErrorCallback& error_callback) {
+  StartDiscoverySessionWithFilterRaw(discovery_filter.get(), callback,
+                                     error_callback);
+}
+
 }  // namespace device