No tracing of nop traceable fields (#29926)

* Add `no_trace` option to JSTraceable derive

* NoTrace wrapper

* Port some types to no_trace schematics

* Fixing my unsafe mistakes (not tracing traceables)

* Add docs & safety guards for no_trace

Safety guards (trait shenanigans) guarantees safety usage of `no_trace`

* Port canvas_traits to no_trace

* Port servo_media to no_trace

* Port net_traits to no_trace

* Port style to no_trace

* Port webgpu to no_trace

* Port script_traits to no_trace

* Port canvas_traits, devtools_traits, embedder_traits, profile_traits to no_trace

* unrooted_must_root lint in seperate file

* Add trace_in_no_trace_lint as script_plugin

* Composable types in must_not_have_traceable

* Introduced HashMapTracedValues wrapper

* `HashMap<NoTrace<K>,V>`->`HashMapTracedValues<K,V>`

* Port rest of servo's types to no_trace

* Port html5ever, euclid, mime and http to no_trace

* Port remaining externals to no_trace

* Port webxr and Arc<Mutex<_>>

* Fix spelling in notrace doc

1 files changed, 7 insertions, 6 deletions

diff --git a/components/script/dom/htmlformelement.rs b/components/script/dom/htmlformelement.rs
index 7594026046c..9a1cdc40555 100644
--- a/components/script/dom/htmlformelement.rs
+++ b/components/script/dom/htmlformelement.rs
@@ -76,11 +76,12 @@ use style::element_state::ElementState;
 use style::str::split_html_space_chars;
 
 use crate::dom::bindings::codegen::UnionTypes::RadioNodeListOrElement;
-use std::collections::HashMap;
 use time::{now, Duration, Tm};
 
 use crate::dom::bindings::codegen::Bindings::NodeBinding::{NodeConstants, NodeMethods};
 
+use super::bindings::trace::{HashMapTracedValues, NoTrace};
+
 #[derive(Clone, Copy, JSTraceable, MallocSizeOf, PartialEq)]
 pub struct GenerationId(u32);
 
@@ -93,7 +94,7 @@ pub struct HTMLFormElement {
     elements: DomOnceCell<HTMLFormControlsCollection>,
     generation_id: Cell<GenerationId>,
     controls: DomRefCell<Vec<Dom<Element>>>,
-    past_names_map: DomRefCell<HashMap<Atom, (Dom<Element>, Tm)>>,
+    past_names_map: DomRefCell<HashMapTracedValues<Atom, (Dom<Element>, NoTrace<Tm>)>>,
     firing_submission_events: Cell<bool>,
     rel_list: MutNullableDom<DOMTokenList>,
 }
@@ -116,7 +117,7 @@ impl HTMLFormElement {
             elements: Default::default(),
             generation_id: Cell::new(GenerationId(0)),
             controls: DomRefCell::new(Vec::new()),
-            past_names_map: DomRefCell::new(HashMap::new()),
+            past_names_map: DomRefCell::new(HashMapTracedValues::new()),
             firing_submission_events: Cell::new(false),
             rel_list: Default::default(),
         }
@@ -441,7 +442,7 @@ impl HTMLFormElementMethods for HTMLFormElement {
             name,
             (
                 Dom::from_ref(&*element_node.downcast::<Element>().unwrap()),
-                now(),
+                NoTrace(now()),
             ),
         );
 
@@ -555,7 +556,7 @@ impl HTMLFormElementMethods for HTMLFormElement {
             let entry = SourcedName {
                 name: key.clone(),
                 element: DomRoot::from_ref(&*val.0),
-                source: SourcedNameSource::Past(now() - val.1), // calculate difference now()-val.1 to find age
+                source: SourcedNameSource::Past(now() - val.1 .0), // calculate difference now()-val.1 to find age
             };
             sourced_names_vec.push(entry);
         }
@@ -1336,7 +1337,7 @@ impl HTMLFormElement {
             // changes form owner, then its entries must be removed
             // from that map."
             let mut past_names_map = self.past_names_map.borrow_mut();
-            past_names_map.retain(|_k, v| v.0 != control);
+            past_names_map.0.retain(|_k, v| v.0 != control);
         }
         self.update_validity();
     }