Use udev for serial device enumeration on Linux

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 {
 
   dictionary DeviceInfo {
     // The device's system path. This should be passed as the <code>path</code>
     // argument to <code>chrome.serial.connect</code> in order to connect to
     // this device.
     DOMString path;
+
+    // A PCI or USB vendor ID if one can be determined for the underlying
+    // device. Zero otherwise.

[scheib, 2014/02/10 23:37:52]

Indicate in what Chrome version these become available, or just that they must
be feature detected as they were added later. File an issue to clean up doc
later after API is stable again.

[rpaquay, 2014/02/12 00:39:28]

Should these fields be optional instead of using default values?

+    long vendorId;
+
+    // A USB product ID if one can be determined for the underlying device.
+    // Zero otherwise.
+    long productId;
+
+    // A human-readable display name for the underlying device if one can be
+    // queried from the host driver. Empty otherwise.
+    DOMString displayName;
   };
 
   callback GetDevicesCallback = void (DeviceInfo[] ports);
 
   enum DataBits { seven, eight };
   enum ParityBit { no, odd, even };
   enum StopBits { one, two };
 
   dictionary ConnectionOptions {
     // Flag indicating whether or not the connection should be left open when
@@ skipping 279 matching lines @@
     // |info| : Event data.
     static void onReceive(ReceiveInfo info);
 
     // Event raised when an error occurred while the runtime was waiting for
     // data on the serial port. Once this event is raised, the connection may be
     // set to <code>paused</code>. A <code>"timeout"</code> error does not pause
     // the connection.
     static void onReceiveError(ReceiveErrorInfo info);
   };
 };