Implement the host side of serial connection I/O on data pipe.

device/serial/serial_service_impl.h

Index: device/serial/serial_service_impl.h
diff --git a/device/serial/serial_service_impl.h b/device/serial/serial_service_impl.h
index 17d93c276618c19ed5f122b9aece92b890f9a8bc..8d78d540f664cba7c131f415caaa9f6e06c380ae 100644
--- a/device/serial/serial_service_impl.h
+++ b/device/serial/serial_service_impl.h
@@ -7,6 +7,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
+#include "device/serial/data_stream.mojom.h"
 #include "device/serial/serial.mojom.h"
 #include "device/serial/serial_connection_factory.h"
 #include "device/serial/serial_device_enumerator.h"
@@ -35,14 +36,13 @@ class SerialServiceImpl : public mojo::InterfaceImpl<serial::SerialService> {
   virtual void Connect(
       const mojo::String& path,
       serial::ConnectionOptionsPtr options,
-      mojo::InterfaceRequest<serial::Connection> connection_request) OVERRIDE;
+      mojo::InterfaceRequest<serial::Connection> connection_request,
+      mojo::InterfaceRequest<serial::DataSink> sink,
+      mojo::InterfaceRequest<serial::DataSource> source) OVERRIDE;
 
  private:
   SerialDeviceEnumerator* GetDeviceEnumerator();
   bool IsValidPath(const mojo::String& path);
-  void OnConnected(
-      const mojo::Callback<void(serial::ConnectionInfoPtr)>& callback,
-      serial::ConnectionInfoPtr result);
 
   scoped_ptr<SerialDeviceEnumerator> device_enumerator_;
   scoped_refptr<SerialConnectionFactory> connection_factory_;