feat: state platform metrics and chrome in theme

crates/core/tests/control_sizes.rs

@@ -36,10 +36,11 @@ impl Render for Harness {
     }
 }
 
-/// A medium input is exactly `input_height`, and sits taller than the
-/// medium button: native text fields are a touch taller than push buttons.
+/// The medium input renders at the theme's stated field height and the
+/// medium button at the stated control height; the two match wherever the
+/// platform states equal values (macOS, Windows, GNOME).
 #[gpui::test]
-fn medium_input_is_taller_than_the_button(cx: &mut TestAppContext) {
+fn controls_render_at_the_stated_heights(cx: &mut TestAppContext) {
     cx.update(Theme::init);
     let state = cx.update(|cx| InputState::new_with_text("", cx));
     let state_for_window = state.clone();
@@ -58,9 +59,9 @@ fn medium_input_is_taller_than_the_button(cx: &mut TestAppContext) {
         .debug_bounds("input-wrapper")
         .expect("input rendered");
 
-    // The input's height is the theme table's (platform-stated) field height;
-    // both bounds are snapped to device pixels, so allow half a pixel.
+    // Both bounds are snapped to device pixels, so allow half a pixel.
     let input_height = cx.update(|cx| cx.theme().sizes.medium.input_height);
-    assert!(input.size.height > button.size.height);
+    let button_height = cx.update(|cx| cx.theme().sizes.medium.control_height);
     assert!((input.size.height - input_height).abs() <= gpui::px(0.5));
+    assert!((button.size.height - button_height).abs() <= gpui::px(0.5));
 }