libservo: Move size handling to RenderContext from WindowMethods (#35621)

This is the first step toward removing `WindowMethods`, which will
gradually be integrated into the `WebView` and `WebViewDelegate`. Sizing
of the `WebView` is now handled by the a size associated with a
`RenderingContext`. `WebView`s will eventually just paint the entire
size of their `RenderingContext`. Notes:

- This is transitionary step so now there is a `WebView::resize` and a
  `WebView::move_resize`. The first is the future which will resize the
  `WebView` and its associated `RenderingContext`. The second is a
  function that the virtual `WebView`s that will soon be replaced by a
  the one-`WebView` per `WebView` model.
- We do not need to call `WebView::move_resize` at as much any longer
  because the default size of the `WebView` is to take up the whole
  `RenderingContext`.
- `SurfmanRenderingContext` is no longer exposed in the API, as a
  surfman context doesn't naturally have a size unless a surface is
  bound to it.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

ports/servoshell/desktop/minibrowser.rs

@@ -7,6 +7,7 @@ use std::rc::Rc;
 use std::sync::Arc;
 use std::time::Instant;
 
+use dpi::PhysicalSize;
 use egui::text::{CCursor, CCursorRange};
 use egui::text_edit::TextEditState;
 use egui::{
@@ -379,13 +380,11 @@ impl Minibrowser {
                 // If the top parts of the GUI changed size, then update the size of the WebView and also
                 // the size of its RenderingContext.
                 let available_size = ui.available_size();
-                let rect = Box2D::from_origin_and_size(
-                    Point2D::origin(),
-                    Size2D::new(available_size.x, available_size.y),
-                ) * scale;
+                let size = Size2D::new(available_size.x, available_size.y) * scale;
+                let rect = Box2D::from_origin_and_size(Point2D::origin(), size);
                 if rect != webview.rect() {
                     webview.move_resize(rect);
-                    rendering_context.resize(rect.size().to_i32().to_untyped());
+                    webview.resize(PhysicalSize::new(size.width as u32, size.height as u32))
                 }
 
                 let min = ui.cursor().min;