Revert of Revert of 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 12 matching lines @@
         '<(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/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',
       ],
     },
     {
       'target_name': 'ozone',
@@ skipping 143 matching lines @@
         'platform/dri/gbm.gypi',
       ],
     }],
     ['<(ozone_platform_test) == 1', {
       'includes': [
         'platform/test/test.gypi',
       ],
     }],
   ],
 }