Refactor common boilerplate out of serialize/transfer implementations (#35831)

* script: Create infrastructure for reducing hand-written serializable/transferrable implementations.

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

* script: Clone all serializable DOM interfaces.

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

* script: Deserialize all serializable DOM interfaces.

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

* script: Serialize all serializable DOM interfaces.

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

* script: Transfer-receive all transferable DOM interfaces.

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

* script: Transfer all transferable DOM interfaces.

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

* Formatting.

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

* script: Extract boilerplate from serialize/deserialize implementations.

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

* script: Extract boilerplate from transfer-receive.

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

* script: Extract boilerplate from transfer operation.

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

* Tidy fixes.

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

* script: Check transferability of all DOM interfaces.

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

* Clippy fixes.

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

* Clippy fixes.

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

* Remove unnecessary duplicate crate.

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/dom/bindings/serializable.rs

@@ -5,8 +5,14 @@
 //! Trait representing the concept of [serializable objects]
 //! (<https://html.spec.whatwg.org/multipage/#serializable-objects>).
 
+use std::collections::HashMap;
+use std::num::NonZeroU32;
+
+use base::id::PipelineNamespaceId;
+
 use crate::dom::bindings::reflector::DomObject;
-use crate::dom::bindings::structuredclone::{StructuredDataReader, StructuredDataWriter};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::structuredclone::{StructuredData, StructuredDataReader};
 use crate::dom::globalscope::GlobalScope;
 use crate::script_runtime::CanGc;
 
@@ -18,16 +24,51 @@ pub(crate) struct StorageKey {
     pub(crate) name_space: u32,
 }
 
+impl StorageKey {
+    pub(crate) fn new(name_space: PipelineNamespaceId, index: NonZeroU32) -> StorageKey {
+        let name_space = name_space.0.to_ne_bytes();
+        let index = index.get().to_ne_bytes();
+        StorageKey {
+            index: u32::from_ne_bytes(index),
+            name_space: u32::from_ne_bytes(name_space),
+        }
+    }
+}
+
+pub(crate) trait IntoStorageKey
+where
+    Self: Sized,
+{
+    fn into_storage_key(self) -> StorageKey;
+}
+
 /// Interface for serializable platform objects.
 /// <https://html.spec.whatwg.org/multipage/#serializable>
-pub(crate) trait Serializable: DomObject {
+pub(crate) trait Serializable: DomObject
+where
+    Self: Sized,
+{
+    type Id: Copy + Eq + std::hash::Hash + IntoStorageKey + From<StorageKey>;
+    type Data;
+
     /// <https://html.spec.whatwg.org/multipage/#serialization-steps>
-    fn serialize(&self, sc_writer: &mut StructuredDataWriter) -> Result<StorageKey, ()>;
+    fn serialize(&self) -> Result<(Self::Id, Self::Data), ()>;
     /// <https://html.spec.whatwg.org/multipage/#deserialization-steps>
     fn deserialize(
         owner: &GlobalScope,
-        sc_reader: &mut StructuredDataReader,
-        extra_data: StorageKey,
+        serialized: Self::Data,
         can_gc: CanGc,
-    ) -> Result<(), ()>;
+    ) -> Result<DomRoot<Self>, ()>
+    where
+        Self: Sized;
+
+    /// Returns the field of [StructuredDataReader]/[StructuredDataWriter] that
+    /// should be used to read/store serialized instances of this type.
+    fn serialized_storage(data: StructuredData<'_>) -> &mut Option<HashMap<Self::Id, Self::Data>>;
+
+    /// Returns the field of [StructuredDataReader] that should be used to store
+    /// deserialized instances of this type.
+    fn deserialized_storage(
+        reader: &mut StructuredDataReader,
+    ) -> &mut Option<HashMap<StorageKey, DomRoot<Self>>>;
 }