Set serial connection parameters immediately on connect.

device/serial/test_serial_io_handler.h

Index: device/serial/test_serial_io_handler.h
diff --git a/device/serial/test_serial_io_handler.h b/device/serial/test_serial_io_handler.h
index dfa27dbf09b523a332d4c37597aa45e6d755932c..52cb16a520f76f095ed61b8cb6352881e96eb9dc 100644
--- a/device/serial/test_serial_io_handler.h
+++ b/device/serial/test_serial_io_handler.h
@@ -21,12 +21,13 @@ class TestSerialIoHandler : public SerialIoHandler {
 
   // SerialIoHandler overrides.
   void Open(const std::string& port,
+            const serial::ConnectionOptions& options,
             const OpenCompleteCallback& callback) override;
-  bool ConfigurePort(const serial::ConnectionOptions& options) override;
   void ReadImpl() override;
   void CancelReadImpl() override;
   void WriteImpl() override;
   void CancelWriteImpl() override;
+  bool ConfigurePortImpl() override;
   serial::DeviceControlSignalsPtr GetControlSignals() const override;
   serial::ConnectionInfoPtr GetPortInfo() const override;
   bool Flush() const override;