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>

1 files changed, 7 insertions, 1 deletions

diff --git a/components/servo/webview_delegate.rs b/components/servo/webview_delegate.rs
index 9ea75e32af6..0af15d7e417 100644
--- a/components/servo/webview_delegate.rs
+++ b/components/servo/webview_delegate.rs
@@ -9,7 +9,7 @@ use constellation_traits::ConstellationMsg;
 use embedder_traits::{
     AllowOrDeny, AuthenticationResponse, ContextMenuResult, Cursor, FilterPattern,
     GamepadHapticEffectType, InputMethodType, LoadStatus, MediaSessionEvent, Notification,
-    PermissionFeature, SimpleDialog, WebResourceRequest, WebResourceResponse,
+    PermissionFeature, ScreenGeometry, SimpleDialog, WebResourceRequest, WebResourceResponse,
     WebResourceResponseMsg,
 };
 use ipc_channel::ipc::IpcSender;
@@ -297,6 +297,12 @@ impl Drop for InterceptedWebResourceLoad {
 }
 
 pub trait WebViewDelegate {
+    /// Get the [`ScreenGeometry`] for this [`WebView`]. If this is unimplemented or returns `None`
+    /// the screen will have the size of the [`WebView`]'s `RenderingContext` and `WebView` will be
+    /// considered to be positioned at the screen's origin.
+    fn screen_geometry(&self, _webview: WebView) -> Option<ScreenGeometry> {
+        None
+    }
     /// The URL of the currently loaded page in this [`WebView`] has changed. The new
     /// URL can accessed via [`WebView::url`].
     fn notify_url_changed(&self, _webview: WebView, _url: Url) {}