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

ui/ozone/platform/drm/ozone_platform_drm.h

Index: ui/ozone/platform/drm/ozone_platform_drm.h
diff --git a/ui/ozone/platform/drm/ozone_platform_drm.h b/ui/ozone/platform/drm/ozone_platform_drm.h
index 5837870d15bc6d88842d051faa6de9d58b9460f1..d21507c96a500490ba893df253dd9dea250342f5 100644
--- a/ui/ozone/platform/drm/ozone_platform_drm.h
+++ b/ui/ozone/platform/drm/ozone_platform_drm.h
@@ -7,13 +7,19 @@
 
 namespace ui {
 
+class NativePixmapClient;
 class OzonePlatform;
 
-// Constructor hook for use in ozone_platform_list.cc
+// Constructor hook for use in constructor_list.cc
 OzonePlatform* CreateOzonePlatformDri();
 
 OzonePlatform* CreateOzonePlatformDrm();
 
+// Constructor hook for use in constructor_list.cc
+NativePixmapClient* CreateNativePixmapClientDri();
+
+NativePixmapClient* CreateNativePixmapClientDrm();
+
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_OZONE_PLATFORM_DRM_H_