Add lots of GN targets

ui/gfx/ipc/gfx_ipc.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
      {
+      # GN version: //ui/gfx/ipc
       'target_name': 'gfx_ipc',
       'type': '<(component)',
       'dependencies': [
         '../../../base/base.gyp:base',
         '../../../ipc/ipc.gyp:ipc',
         '../../../skia/skia.gyp:skia',
         '../gfx.gyp:gfx_geometry',
       ],
       'defines': [
         'GFX_IPC_IMPLEMENTATION',
       ],
       'include_dirs': [
         '../../..',
       ],
       'sources': [
         'gfx_param_traits.cc',
         'gfx_param_traits.h',
       ],
     },
   ],
 }