Copyright 2021 The Chromium Authors. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice (including the next paragraph) shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. The global interface which allows attaching virtio-gpu metadata to wl_surface objects. Instantiate an virtio_gpu_surface_metadata_v1 extension for the given wl_surface to attach virtio gpu metadata. If the given wl_surface already has a surface metadata object associated, the surface_metadata_exists protocol error is raised. An additional interface to a wl_surface object, which allows the client to attach additional metadata to the surface. If the wl_surface associated with the virtio_gpu_surface_metadata_v1 is destroyed, all virtio_gpu_surface_metadata_v1 requests except 'destroy' raise the protocol error no_surface. If the virtio_gpu_surface_metadata_v1 object is destroyed, the metadata state is removed from the wl_surface. The change will be applied on the next wl_surface.commit. Set the virtio gpu scanout id of the associated wl_surface.