Use separate mutexes and call queues for resolution and load balancing

test/cpp/end2end/client_lb_end2end_test.cc

@@ -1651,14 +1651,17 @@ TEST_F(ClientLbEnd2endTest, ChannelIdleness) {
   // The initial channel state should be IDLE.
   EXPECT_EQ(channel->GetState(false), GRPC_CHANNEL_IDLE);
   // After sending RPC, channel state should be READY.
+  gpr_log(GPR_INFO, "*** SENDING RPC, CHANNEL SHOULD CONNECT ***");
   response_generator.SetNextResolution(GetServersPorts());
   CheckRpcSendOk(stub, DEBUG_LOCATION);
   EXPECT_EQ(channel->GetState(false), GRPC_CHANNEL_READY);
   // After a period time not using the channel, the channel state should switch
   // to IDLE.
+  gpr_log(GPR_INFO, "*** WAITING FOR CHANNEL TO GO IDLE ***");
   gpr_sleep_until(grpc_timeout_milliseconds_to_deadline(1200));
   EXPECT_EQ(channel->GetState(false), GRPC_CHANNEL_IDLE);
   // Sending a new RPC should awake the IDLE channel.
+  gpr_log(GPR_INFO, "*** SENDING ANOTHER RPC, CHANNEL SHOULD RECONNECT ***");
   response_generator.SetNextResolution(GetServersPorts());
   CheckRpcSendOk(stub, DEBUG_LOCATION);
   EXPECT_EQ(channel->GetState(false), GRPC_CHANNEL_READY);