Convert SerialIoHandler to use Mojo types.

device/serial/serial.mojom

Index: device/serial/serial.mojom
diff --git a/device/serial/serial.mojom b/device/serial/serial.mojom
index f925dff33cd1b32c622e5b783057893c7c262379..d23f146ec8ecc2b11fcc269f27d3206c0491e995 100644
--- a/device/serial/serial.mojom
+++ b/device/serial/serial.mojom
@@ -13,4 +13,70 @@ struct SerialDeviceInfo {
   string display_name;
 };
 
+enum SendError {
+  SEND_ERROR_NONE,
+  SEND_ERROR_DISCONNECTED,
+  SEND_ERROR_PENDING,
+  SEND_ERROR_TIMEOUT,
+  SEND_ERROR_SYSTEM_ERROR,
+};
+
+enum ReceiveError {
+  RECEIVE_ERROR_NONE,
+  RECEIVE_ERROR_DISCONNECTED,
+  RECEIVE_ERROR_TIMEOUT,
+  RECEIVE_ERROR_DEVICE_LOST,
+  RECEIVE_ERROR_SYSTEM_ERROR,
+};
+
+enum DataBits {
+  DATA_BITS_NONE,
+  DATA_BITS_SEVEN,
+  DATA_BITS_EIGHT,
+};
+
+enum ParityBit {
+  PARITY_BIT_NONE,
+  PARITY_BIT_NO,
+  PARITY_BIT_ODD,
+  PARITY_BIT_EVEN,
+};
+
+enum StopBits {
+  STOP_BITS_NONE,
+  STOP_BITS_ONE,
+  STOP_BITS_TWO,
+};
+
+struct ConnectionOptions {
+  uint32 bitrate = 0;
+  DataBits data_bits = DATA_BITS_NONE;
+  ParityBit parity_bit = PARITY_BIT_NONE;
+  StopBits stop_bits = STOP_BITS_NONE;
+  bool cts_flow_control;
+  bool has_cts_flow_control = false;
+};
+
+struct ConnectionInfo {
+  uint32 bitrate = 0;
+  DataBits data_bits = DATA_BITS_NONE;
+  ParityBit parity_bit = PARITY_BIT_NONE;
+  StopBits stop_bits = STOP_BITS_NONE;
+  bool cts_flow_control;
+};
+
+struct HostControlSignals {
+  bool dtr;
+  bool has_dtr = false;
+  bool rts;
+  bool has_rts = false;
+};
+
+struct DeviceControlSignals {
+  bool dcd;
+  bool cts;
+  bool ri;
+  bool dsr;
+};
+
 }