Extract //device/usb mocks so that they can be shared.

device/usb/usb.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 59 matching lines @@
             '../udev_linux/udev.gyp:udev_linux',
           ],
         }],
         ['chromeos==1', {
           'dependencies': [
             '../../chromeos/chromeos.gyp:chromeos',
           ],
         }],
       ]
     },
+    {
+      'target_name': 'device_usb_mocks',
+      'type': 'static_library',
+      'include_dirs': [
+        '../..',
+      ],
+      'dependencies': [
+        '../../testing/gmock.gyp:gmock',
+        'device_usb',
+      ],
+      'sources': [
+        'mock_usb_device.cc',
+        'mock_usb_device.h',
+        'mock_usb_device_handle.cc',
+        'mock_usb_device_handle.h',
+        'mock_usb_service.cc',
+        'mock_usb_service.h',
+      ],
+    },
   ],
 }