libservo: Start moving WindowMethods to WebViewDelegate (#36223)

`WindowMethods` is used by the embedding layer to get information from
the embedder. This change moves the functionality for getting screen
size and `WebView` offsets to `WebViewDelegate`.

This is important because `WebView`s might be on different screens or
have different offsets on the screen itself, so it makes sense for this
to be per-`WebView` and not global to the embedder. HiDPI and animation
state functionality will move to the embedder in subsequent changes.

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

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because they just modify the
`WebView` API surface a bit.

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

components/compositing/windowing.rs

@@ -9,7 +9,7 @@ use std::fmt::Debug;
 use embedder_traits::{EventLoopWaker, MouseButton};
 use euclid::Scale;
 use net::protocols::ProtocolRegistry;
-use servo_geometry::{DeviceIndependentIntRect, DeviceIndependentIntSize, DeviceIndependentPixel};
+use servo_geometry::DeviceIndependentPixel;
 use webrender_api::units::{DevicePixel, DevicePoint};
 
 #[derive(Clone)]
@@ -37,12 +37,14 @@ pub enum AnimationState {
 // for creating the GL context, making it current, buffer
 // swapping, etc. Really that should all be done by surfman.
 pub trait WindowMethods {
-    /// Get the coordinates of the native window, the screen and the framebuffer.
-    fn get_coordinates(&self) -> EmbedderCoordinates;
+    /// Get the HighDPI factor of the native window, the screen and the framebuffer.
+    /// TODO(martin): Move this to `RendererWebView` when possible.
+    fn hidpi_factor(&self) -> Scale<f32, DeviceIndependentPixel, DevicePixel>;
     /// Set whether the application is currently animating.
     /// Typically, when animations are active, the window
     /// will want to avoid blocking on UI events, and just
     /// run the event loop at the vsync interval.
+    /// TODO(martin): Move this to `RendererWebView` when possible.
     fn set_animation_state(&self, _state: AnimationState);
 }
 
@@ -65,15 +67,3 @@ pub trait EmbedderMethods {
         ProtocolRegistry::default()
     }
 }
-
-#[derive(Clone, Copy, Debug)]
-pub struct EmbedderCoordinates {
-    /// The pixel density of the display.
-    pub hidpi_factor: Scale<f32, DeviceIndependentPixel, DevicePixel>,
-    /// Size of the screen.
-    pub screen_size: DeviceIndependentIntSize,
-    /// Size of the available screen space (screen without toolbars and docks).
-    pub available_screen_size: DeviceIndependentIntSize,
-    /// Position and size of the native window.
-    pub window_rect: DeviceIndependentIntRect,
-}