Move more bindings types to script_bindings (#35620)

* Move weak references implementation to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Move maplike/setlike definitions to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Move base error types to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Formatting.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script_bindings/iterable.rs

@@ -0,0 +1,40 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use js::conversions::ToJSValConvertible;
+
+use crate::utils::DOMClass;
+
+/// The values that an iterator will iterate over.
+#[derive(JSTraceable, MallocSizeOf)]
+pub enum IteratorType {
+    /// The keys of the iterable object.
+    Keys,
+    /// The values of the iterable object.
+    Values,
+    /// The keys and values of the iterable object combined.
+    Entries,
+}
+
+/// A DOM object that can be iterated over using a pair value iterator.
+pub trait Iterable {
+    /// The type of the key of the iterator pair.
+    type Key: ToJSValConvertible;
+    /// The type of the value of the iterator pair.
+    type Value: ToJSValConvertible;
+    /// Return the number of entries that can be iterated over.
+    fn get_iterable_length(&self) -> u32;
+    /// Return the value at the provided index.
+    fn get_value_at_index(&self, index: u32) -> Self::Value;
+    /// Return the key at the provided index.
+    fn get_key_at_index(&self, index: u32) -> Self::Key;
+}
+
+/// A version of the [IDLInterface] trait that is specific to types that have
+/// iterators defined for them. This allows the `script` crate to define the
+/// derives check for the concrete interface type, while the [IteratableIterator]
+/// type defined in this module can be parameterized over an unknown generic.
+pub trait IteratorDerives {
+    fn derives(class: &'static DOMClass) -> bool;
+}