Add the implementation skeleton for systeminfo.cpu API

chrome/chrome_browser_extensions.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 191 matching lines @@
         'browser/extensions/api/serial/serial_port_enumerator_posix.cc',
         'browser/extensions/api/serial/serial_port_enumerator_win.cc',
         'browser/extensions/api/socket/socket.cc',
         'browser/extensions/api/socket/socket.h',
         'browser/extensions/api/socket/socket_api.cc',
         'browser/extensions/api/socket/socket_api.h',
         'browser/extensions/api/socket/tcp_socket.cc',
         'browser/extensions/api/socket/tcp_socket.h',
         'browser/extensions/api/socket/udp_socket.cc',
         'browser/extensions/api/socket/udp_socket.h',
+        'browser/extensions/api/system_info_cpu/cpu_info_provider.h',
+        'browser/extensions/api/system_info_cpu/system_info_cpu_api.cc',
+        'browser/extensions/api/system_info_cpu/system_info_cpu_api.h',
         'browser/extensions/api/tabs/tabs_constants.cc',
         'browser/extensions/api/tabs/tabs_constants.h',
         'browser/extensions/api/terminal/terminal_extension_helper.cc',
         'browser/extensions/api/terminal/terminal_extension_helper.h',
         'browser/extensions/api/terminal/terminal_private_api.cc',
         'browser/extensions/api/terminal/terminal_private_api.h',
         'browser/extensions/api/usb/usb_api.cc',
         'browser/extensions/api/usb/usb_api.h',
         'browser/extensions/api/usb/usb_device_resource.cc',
         'browser/extensions/api/usb/usb_device_resource.h',
@@ skipping 536 matching lines @@
           'sources': [
             'browser/extensions/app_host.rc',
             'browser/extensions/app_host_stub_main.cc',
           ],
         },
       ],
     }, ],  # 'OS=="win"'
   ],  # 'conditions'
 }