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

ui/ozone/BUILD.gn

Index: ui/ozone/BUILD.gn
diff --git a/ui/ozone/BUILD.gn b/ui/ozone/BUILD.gn
index fa633c693cf56fd013411255dee9f7be1c25b400..32c87b9efef7679bc583593fcb405436cc7bef55 100644
--- a/ui/ozone/BUILD.gn
+++ b/ui/ozone/BUILD.gn
@@ -97,6 +97,8 @@ component("ozone") {
     "platform_selection.h",
     "public/input_controller.cc",
     "public/input_controller.h",
+    "public/native_pixmap_manager.cc",
+    "public/native_pixmap_manager.h",
     "public/ozone_gpu_test_helper.cc",
     "public/ozone_gpu_test_helper.h",
     "public/ozone_platform.cc",
@@ -165,7 +167,9 @@ action("generate_constructor_list") {
     "--output_cc=" + rebase_path(constructor_list_cc_file, root_build_dir),
     "--namespace=ui",
     "--typename=OzonePlatform",
+    "--typename=NativePixmapManager",
     "--include=\"ui/ozone/public/ozone_platform.h\"",
+    "--include=\"ui/ozone/public/native_pixmap_manager.h\"",
   ]
 
   deps = [