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

ui/ozone/platform/caca/caca.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_caca',
     ],
     'internal_ozone_platforms': [
@@ skipping 21 matching lines @@
           '-lcaca',
         ],
       },
       'sources': [
         'caca_event_source.cc',
         'caca_event_source.h',
         'caca_window.cc',
         'caca_window.h',
         'caca_window_manager.cc',
         'caca_window_manager.h',
+        'native_pixmap_manager_caca.cc',
+        'native_pixmap_manager_caca.h',
         'ozone_platform_caca.cc',
         'ozone_platform_caca.h',
         'scoped_caca_types.cc',
         'scoped_caca_types.h',
       ],
     },
   ],
 }