Adds Serial API to set data bits, parity, stop bits.

chrome/common/extensions/api/serial.idl

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Use the <code>chrome.serial</code> API to read from and write to a device
 // connected to a serial port.
 namespace serial {
 
   callback GetPortsCallback = void (DOMString[] ports);
 
+  enum DataBit { sevenbit, eightbit };
+  enum ParityBit { noparity, oddparity, evenparity };
+  enum StopBit { onestopbit, twostopbit };
+
   dictionary OpenOptions {
     // The requested bitrate of the connection to be opened. For compatibility
     // with the widest range of hardware, this number should match one of
     // commonly-available bitrates, such as 110, 300, 1200, 2400, 4800, 9600,
     // 14400, 19200, 38400, 57600, 115200. There is no guarantee, of course,
     // that the device connected to the serial port will support the requested
     // bitrate, even if the port itself supports that bitrate.
-    long bitrate;
+    long? bitrate;

[miket_OOO, 2013/08/21 19:43:44]

It's OK if we make bitrate optional, but we should document here that the
default is 9600. Otherwise people will have to guess it.

[limasdf, 2013/08/24 15:46:24]

Done.

+    DataBit? dataBit;
+    ParityBit? parityBit;
+    StopBit? stopBit;
   };
 
   dictionary OpenInfo {
     // The id of the opened connection.
     long connectionId;
   };
 
   callback OpenCallback = void (OpenInfo openInfo);
 
   // Returns true if operation was successful.
@@ skipping 97 matching lines @@
 
     static void getControlSignals(long connectionId,
                                   GetControlSignalsCallback callback);
 
     static void setControlSignals(long connectionId,
                                   ControlSignalOptions options,
                                   SetControlSignalsCallback callback);
   };
 
 };