test lib changes

test/core/client_channel/lb_policy/xds_override_host_test.cc

@@ -207,7 +207,8 @@ class XdsOverrideHostTest : public LoadBalancingPolicyTest {
     std::vector<std::string> actual_picks;
     for (size_t i = 0; i < expected.size(); ++i) {
       auto address = ExpectPickComplete(
-          picker, {attribute}, /*subchannel_call_tracker=*/nullptr, location);
+          picker, {attribute}, /*subchannel_call_tracker=*/nullptr,
+          /*picked_subchannel=*/nullptr, location);
       ASSERT_TRUE(address.has_value())
           << location.file() << ":" << location.line();
       EXPECT_THAT(*address, ::testing::AnyOfArray(expected))