script: Move the FontContext to Window (#34845)

This will allow using layout's `FontContext` in `Window` letting script
manage font selection and download.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>

components/malloc_size_of/lib.rs

@@ -50,6 +50,7 @@ use std::cell::OnceCell;
 use std::collections::BinaryHeap;
 use std::hash::{BuildHasher, Hash};
 use std::ops::Range;
+use std::sync::Arc;
 
 pub use style_malloc_size_of::MallocSizeOfOps;
 use uuid::Uuid;
@@ -523,6 +524,38 @@ impl<T: MallocSizeOf> MallocConditionalSizeOf for servo_arc::Arc<T> {
     }
 }
 
+impl<T> MallocUnconditionalShallowSizeOf for Arc<T> {
+    fn unconditional_shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        unsafe { ops.malloc_size_of(Arc::as_ptr(self)) }
+    }
+}
+
+impl<T: MallocSizeOf> MallocUnconditionalSizeOf for Arc<T> {
+    fn unconditional_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.unconditional_shallow_size_of(ops) + (**self).size_of(ops)
+    }
+}
+
+impl<T> MallocConditionalShallowSizeOf for Arc<T> {
+    fn conditional_shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if ops.have_seen_ptr(Arc::as_ptr(self)) {
+            0
+        } else {
+            self.unconditional_shallow_size_of(ops)
+        }
+    }
+}
+
+impl<T: MallocSizeOf> MallocConditionalSizeOf for Arc<T> {
+    fn conditional_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if ops.have_seen_ptr(Arc::as_ptr(self)) {
+            0
+        } else {
+            self.unconditional_size_of(ops)
+        }
+    }
+}
+
 /// If a mutex is stored directly as a member of a data type that is being measured,
 /// it is the unique owner of its contents and deserves to be measured.
 ///