ozone: Introduce ClientPixmap and ClientPixmapFactory for non-GPU processes.

ui/ozone/platform/drm/drm.gypi

 # 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': {
     'internal_ozone_platform_deps': [
       'ozone_platform_drm',
     ],
     'internal_ozone_platform_unittest_deps': [
@@ skipping 22 matching lines @@
         '../events/platform/events_platform.gyp:events_platform',
         '../gfx/gfx.gyp:gfx',
         '../gfx/gfx.gyp:gfx_geometry',
       ],
       'defines': [
         'OZONE_IMPLEMENTATION',
       ],
       'sources': [
         'common/drm_util.cc',
         'common/drm_util.h',
+        'common/native_pixmap_manager_drm.cc',
+        'common/native_pixmap_manager_drm.h',
         'common/scoped_drm_types.cc',
         'common/scoped_drm_types.h',
         'gpu/crtc_controller.cc',
         'gpu/crtc_controller.h',
         'gpu/display_change_observer.h',
         'gpu/drm_buffer.cc',
         'gpu/drm_buffer.h',
         'gpu/drm_console_buffer.cc',
         'gpu/drm_console_buffer.h',
         'gpu/drm_device.cc',
@@ skipping 91 matching lines @@
           'gpu/hardware_display_controller_unittest.cc',
           'gpu/hardware_display_plane_manager_unittest.cc',
           'gpu/screen_manager_unittest.cc',
           'test/mock_drm_device.cc',
           'test/mock_drm_device.h',
         ],
       },
     },
   ],
 }