Start on Scene::push_surface

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/gpui/src/platform/mac.rs

@@ -13,6 +13,7 @@ use cocoa::base::{BOOL, NO, YES};
 pub use dispatcher::Dispatcher;
 pub use fonts::FontSystem;
 use platform::{MacForegroundPlatform, MacPlatform};
+pub use renderer::Surface;
 use std::{rc::Rc, sync::Arc};
 use window::Window;
 

crates/gpui/src/platform/mac/renderer.rs

@@ -37,6 +37,10 @@ struct PathSprite {
     shader_data: shaders::GPUISprite,
 }
 
+pub struct Surface {
+    pub bounds: RectF,
+}
+
 impl Renderer {
     pub fn new(
         device: metal::Device,