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In upcoming patches, wgpu will allowing the creation of bind groups with either `TextureView`s or `ExternalTexture`s bound to a `BindingType::ExternalTexture` bind group layout entry. Wgpu-hal and the Naga-generated shaders must be able to handle both of these cases. For external textures they will be provided a uniform buffer containing the external texture's `ExternalTextureParams`. For the texture view case, we must therefore provide the same. To do this, we create a single buffer per device which can be shared between all texture views. We initialize it with the required values in Device::late_init_resources_with_queue(). We know that texture views must have a single RGBA plane, with no rotation or crop-rect. The only thing that can vary between them is their size. We will therefore use the value of [0, 0] in the params buffer to indicate to the shader that it should query the actual texture's size rather than using the value provided in the buffer.