Convert SerialIoHandler to use Mojo types.

chrome/browser/extensions/api/serial/serial_connection.h

Index: chrome/browser/extensions/api/serial/serial_connection.h
diff --git a/chrome/browser/extensions/api/serial/serial_connection.h b/chrome/browser/extensions/api/serial/serial_connection.h
index e7c40f419d1c82dcca1a0daa02761e8c9b210b61..c6b914a8dfd51d544907193f483c5d771bf3f438 100644
--- a/chrome/browser/extensions/api/serial/serial_connection.h
+++ b/chrome/browser/extensions/api/serial/serial_connection.h
@@ -142,11 +142,10 @@ class SerialConnection : public ApiResource,
   void OnSendTimeout();
 
   // Receives read completion notification from the |io_handler_|.
-  void OnAsyncReadComplete(const std::string& data,
-                           api::serial::ReceiveError error);
+  void OnAsyncReadComplete(const std::string& data, device::ReceiveError error);
 
   // Receives write completion notification from the |io_handler_|.
-  void OnAsyncWriteComplete(int bytes_sent, api::serial::SendError error);
+  void OnAsyncWriteComplete(int bytes_sent, device::SendError error);
 
   // The pathname of the serial device.
   std::string port_;
@@ -193,4 +192,24 @@ class SerialConnection : public ApiResource,
 
 }  // namespace extensions
 
+namespace mojo {
+
+template <>
+class TypeConverter<device::HostControlSignalsPtr,
+                    extensions::api::serial::HostControlSignals> {
+ public:
+  static device::HostControlSignalsPtr ConvertFrom(
+      const extensions::api::serial::HostControlSignals& input);
+};
+
+template <>
+class TypeConverter<device::ConnectionOptionsPtr,
+                    extensions::api::serial::ConnectionOptions> {
+ public:
+  static device::ConnectionOptionsPtr ConvertFrom(
+      const extensions::api::serial::ConnectionOptions& input);
+};
+
+}  // namespace mojo
+
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_CONNECTION_H_