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

ui/ozone/platform/drm/BUILD.gn

 # 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.
 
 import("//build/config/linux/pkg_config.gni")
 import("//ui/ozone/ozone.gni")
 
 declare_args() {
   use_mesa_platform_null = false
   use_drm_atomic = false
 }
 
 pkg_config("libdrm") {
   packages = [ "libdrm" ]
 }
 
 source_set("drm_common") {
   sources = [
+    "common/client_pixmap_manager_drm.cc",
+    "common/client_pixmap_manager_drm.h",
     "common/drm_util.cc",
     "common/drm_util.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",
@@ skipping 125 matching lines @@
   }
 }
 
 if (ozone_platform_gbm) {
   pkg_config("libgbm") {
     packages = [ "gbm" ]
   }
 
   source_set("gbm") {
     sources = [
+      "common/client_pixmap_manager_gbm.cc",
+      "common/client_pixmap_manager_gbm.h",
       "gpu/gbm_buffer.cc",
       "gpu/gbm_buffer.h",
       "gpu/gbm_buffer_base.cc",
       "gpu/gbm_buffer_base.h",
       "gpu/gbm_device.cc",
       "gpu/gbm_device.h",
       "gpu/gbm_surface.cc",
       "gpu/gbm_surface.h",
       "gpu/gbm_surface_factory.cc",
       "gpu/gbm_surface_factory.h",
@@ skipping 14 matching lines @@
     public_configs = [
       ":libgbm",
       "//third_party/khronos:khronos_headers",
     ]
 
     if (use_mesa_platform_null) {
       defines += [ "USE_MESA_PLATFORM_NULL" ]
     }
   }
 }