Add a basic Mojo SerialService that implements GetDevices().

device/serial/serial_device_enumerator_linux.cc

 // Copyright 2014 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.
 
 #include "device/serial/serial_device_enumerator_linux.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 
 namespace device {
@@ skipping 27 matching lines @@
   return scoped_ptr<SerialDeviceEnumerator>(new SerialDeviceEnumeratorLinux());
 }
 
 SerialDeviceEnumeratorLinux::SerialDeviceEnumeratorLinux() {
   udev_.reset(udev_new());
 }
 
 SerialDeviceEnumeratorLinux::~SerialDeviceEnumeratorLinux() {}
 
 mojo::Array<serial::DeviceInfoPtr> SerialDeviceEnumeratorLinux::GetDevices() {
-  mojo::Array<serial::DeviceInfoPtr> devices;
+  mojo::Array<serial::DeviceInfoPtr> devices(0);
   ScopedUdevEnumeratePtr enumerate(udev_enumerate_new(udev_.get()));
   if (!enumerate) {
     LOG(ERROR) << "Serial device enumeration failed.";
     return devices.Pass();
   }
   if (udev_enumerate_add_match_subsystem(enumerate.get(), kSerialSubsystem)) {
     LOG(ERROR) << "Serial device enumeration failed.";
     return devices.Pass();
   }
   if (udev_enumerate_scan_devices(enumerate.get())) {
@@ skipping 39 matching lines @@
     }
   }
   return devices.Pass();
 }
 
 void SerialDeviceEnumeratorLinux::UdevDeleter::operator()(udev* handle) {
   udev_unref(handle);
 }
 
 }  // namespace device