Fix ozone build in GN

ui/ozone/ozone.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,
     'external_ozone_platforms': [],
     'external_ozone_platform_files': [],
     'external_ozone_platform_deps': [],
     'external_ozone_platform_unittest_deps': [],
     'internal_ozone_platforms': [],
     'internal_ozone_platform_deps': [],
     'internal_ozone_platform_unittest_deps': [],
   },
   'targets': [
     {
+      # GN version: //ui/ozone:ozone_base
       'target_name': 'ozone_base',
       'type': '<(component)',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/skia/skia.gyp:skia',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx_geometry',
       ],
       'defines': [
         'OZONE_BASE_IMPLEMENTATION',
       ],
       'sources': [
         'public/cursor_factory_ozone.cc',
         'public/cursor_factory_ozone.h',
         'public/event_factory_ozone.cc',
         'public/event_factory_ozone.h',
         'public/gpu_platform_support.cc',
         'public/gpu_platform_support.h',
         'public/gpu_platform_support_host.cc',
         'public/gpu_platform_support_host.h',
         'public/native_pixmap.h',
         'public/overlay_candidates_ozone.cc',
         'public/overlay_candidates_ozone.h',
         'public/surface_factory_ozone.cc',
         'public/surface_factory_ozone.h',
         'public/surface_ozone_canvas.h',
         'public/surface_ozone_egl.h',
       ],
     },
     {
+      # GN version: //ui/ozone
       'target_name': 'ozone',
       'type': '<(component)',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/ipc/ipc.gyp:ipc',
         '<(DEPTH)/skia/skia.gyp:skia',
         '<(DEPTH)/ui/events/events.gyp:events',
         '<(DEPTH)/ui/events/ozone/events_ozone.gyp:events_ozone',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx_geometry',
@@ skipping 35 matching lines @@
         'ozone_platform.cc',
         'ozone_platform.h',
         'ozone_switches.cc',
         'ozone_switches.h',
         'platform_selection.cc',
         'platform_selection.h',
         '<@(external_ozone_platform_files)',
       ],
       'actions': [
         {
+          # GN version: //ui/ozone:generate_ozone_platform_list
           'action_name': 'generate_ozone_platform_list',
           'variables': {
             'generator_path': 'generate_ozone_platform_list.py',
           },
           'inputs': [
             '<(generator_path)',
           ],
           'outputs': [
             '<(platform_list_cc_file)',
             '<(platform_list_h_file)',
             '<(platform_list_txt_file)',
           ],
           'action': [
             'python',
             '<(generator_path)',
             '--output_cc=<(platform_list_cc_file)',
             '--output_h=<(platform_list_h_file)',
             '--output_txt=<(platform_list_txt_file)',
             '--default=<(ozone_platform)',
             '<@(ozone_platforms)',
           ],
         },
         {
+          # GN version: //ui/ozone:generate_constructor_list
           'action_name': 'generate_constructor_list',
           'variables': {
             'generator_path': 'generate_constructor_list.py',
           },
           'inputs': [
             '<(generator_path)',
             '<(platform_list_txt_file)',
           ],
           'outputs': [
             '<(constructor_list_cc_file)',
@@ skipping 59 matching lines @@
         'platform/dri/gbm.gypi',
       ],
     }],
     ['<(ozone_platform_test) == 1', {
       'includes': [
         'platform/test/test.gypi',
       ],
     }],
   ],
 }