Add a basic Mojo SerialService that implements GetDevices().

device/serial/serial_device_enumerator_mac.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_mac.h"
 
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 18 matching lines @@
 
   std::set<std::string> valid_patterns;
   valid_patterns.insert("/dev/*Bluetooth*");
   valid_patterns.insert("/dev/*Modem*");
   valid_patterns.insert("/dev/*bluetooth*");
   valid_patterns.insert("/dev/*modem*");
   valid_patterns.insert("/dev/*serial*");
   valid_patterns.insert("/dev/tty.*");
   valid_patterns.insert("/dev/cu.*");
 
-  mojo::Array<serial::DeviceInfoPtr> devices;
+  mojo::Array<serial::DeviceInfoPtr> devices(0);
   base::FileEnumerator enumerator(kDevRoot, false, kFilesAndSymLinks);
   do {
     const base::FilePath next_device_path(enumerator.Next());
     const std::string next_device = next_device_path.value();
     if (next_device.empty())
       break;
 
     std::set<std::string>::const_iterator i = valid_patterns.begin();
     for (; i != valid_patterns.end(); ++i) {
       if (MatchPattern(next_device, *i)) {
         serial::DeviceInfoPtr info(serial::DeviceInfo::New());
         info->path = next_device;
         devices.push_back(info.Pass());
         break;
       }
     }
   } while (true);
   return devices.Pass();
 }
 
 }  // namespace device