ozone: gpu: Add plumbing for platform-specific gpu messaging

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': [],
@@ skipping 38 matching lines @@
         '<(platform_list_h_file)',
         '<(constructor_list_cc_file)',
 
         # common/chromeos files are excluded automatically when building with
         # chromeos=0, by exclusion rules in filename_rules.gypi due to the
         # 'chromeos' folder name.
         'common/chromeos/native_display_delegate_ozone.cc',
         'common/chromeos/native_display_delegate_ozone.h',
         'common/chromeos/touchscreen_device_manager_ozone.cc',
         'common/chromeos/touchscreen_device_manager_ozone.h',
+        'gpu/gpu_platform_support.cc',
+        'gpu/gpu_platform_support.h',
+        'gpu/gpu_platform_support_host.cc',
+        'gpu/gpu_platform_support_host.h',
         'ozone_platform.cc',
         'ozone_platform.h',
         'ozone_switches.cc',
         'ozone_switches.h',
         'platform_selection.cc',
         'platform_selection.h',
         '<@(external_ozone_platform_files)',
       ],
       'actions': [
         {
@@ skipping 92 matching lines @@
         'platform/dri/gbm.gypi',
       ],
     }],
     ['<(ozone_platform_test) == 1', {
       'includes': [
         'platform/test/test.gypi',
       ],
     }],
   ],
 }