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

device/serial/serial_connection.cc

Index: device/serial/serial_connection.cc
diff --git a/device/serial/serial_connection.cc b/device/serial/serial_connection.cc
index c59aad205f5e223fd26731d099e99cc79d766df9..0d3e4171c84b64a74c2f9807322448548ecff5bd 100644
--- a/device/serial/serial_connection.cc
+++ b/device/serial/serial_connection.cc
@@ -4,15 +4,38 @@
 
 #include "device/serial/serial_connection.h"
 
+#include "base/bind.h"
+#include "device/serial/buffer.h"
+#include "device/serial/data_sink_receiver.h"
+#include "device/serial/data_source_sender.h"
 #include "device/serial/serial_io_handler.h"
 
 namespace device {
 
-SerialConnection::SerialConnection(scoped_refptr<SerialIoHandler> io_handler)
+SerialConnection::SerialConnection(
+    scoped_refptr<SerialIoHandler> io_handler,
+    mojo::InterfaceRequest<serial::DataSink> sink,
+    mojo::InterfaceRequest<serial::DataSource> source)
     : io_handler_(io_handler) {
+  receiver_ = mojo::WeakBindToRequest(
+      new DataSinkReceiver(base::Bind(&SerialConnection::OnSendPipeReady,
+                                      base::Unretained(this)),
+                           base::Bind(&SerialConnection::OnSendCancelled,
+                                      base::Unretained(this)),
+                           base::Bind(base::DoNothing)),
+      &sink);
+  sender_ = mojo::WeakBindToRequest(
+      new DataSourceSender(base::Bind(&SerialConnection::OnReceivePipeReady,
+                                      base::Unretained(this)),
+                           base::Bind(base::DoNothing)),
+      &source);
 }
 
 SerialConnection::~SerialConnection() {
+  receiver_->ShutDown();
+  sender_->ShutDown();
+  io_handler_->CancelRead(serial::RECEIVE_ERROR_DISCONNECTED);
+  io_handler_->CancelWrite(serial::SEND_ERROR_DISCONNECTED);
 }
 
 void SerialConnection::GetInfo(
@@ -41,4 +64,16 @@ void SerialConnection::Flush(const mojo::Callback<void(bool)>& callback) {
   callback.Run(io_handler_->Flush());
 }
 
+void SerialConnection::OnSendCancelled(int32_t error) {
+  io_handler_->CancelWrite(static_cast<serial::SendError>(error));
+}
+
+void SerialConnection::OnSendPipeReady(scoped_ptr<ReadOnlyBuffer> buffer) {
+  io_handler_->Write(buffer.Pass());
+}
+
+void SerialConnection::OnReceivePipeReady(scoped_ptr<WritableBuffer> buffer) {
+  io_handler_->Read(buffer.Pass());
+}
+
 }  // namespace device