Implement the gamepad API in the IPC proxy

content/content_common.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../build/temp_gyp/googleurl.gyp:googleurl',
     '../gpu/gpu.gyp:gles2_implementation',
     '../gpu/gpu.gyp:gpu_ipc',
@@ skipping 180 matching lines @@
     'common/font_config_ipc_linux.h',
     'common/font_list.h',
     'common/font_list_android.cc',
     'common/font_list_mac.mm',
     'common/font_list_win.cc',
     'common/font_list_x11.cc',
     'common/gamepad_hardware_buffer.h',
     'common/gamepad_messages.h',
     'common/gamepad_seqlock.cc',
     'common/gamepad_seqlock.h',
+    'common/gamepad_user_gesture.cc',
+    'common/gamepad_user_gesture.h',
     'common/geolocation_messages.h',
     'common/gpu/client/command_buffer_proxy_impl.cc',
     'common/gpu/client/command_buffer_proxy_impl.h',
     'common/gpu/client/gl_helper.cc',
     'common/gpu/client/gl_helper.h',
     'common/gpu/client/gpu_channel_host.cc',
     'common/gpu/client/gpu_channel_host.h',
     'common/gpu/client/gpu_video_decode_accelerator_host.cc',
     'common/gpu/client/gpu_video_decode_accelerator_host.h',
     'common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc',
@@ skipping 310 matching lines @@
         '../build/extract_from_cab.py',
         '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
         '<(output)',
         '<(PRODUCT_DIR)',
         ],
       },
      ]
     }]
   ],
 }