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, 5 insertions, 0 deletions

diff --git a/components/script/dom/servoparser/mod.rs b/components/script/dom/servoparser/mod.rs
index ba114366aa2..44d0c3de1df 100644
--- a/components/script/dom/servoparser/mod.rs
+++ b/components/script/dom/servoparser/mod.rs
@@ -95,9 +95,11 @@ pub struct ServoParser {
     network_decoder: DomRefCell<Option<NetworkDecoder>>,
     /// Input received from network.
     #[ignore_malloc_size_of = "Defined in html5ever"]
+    #[no_trace]
     network_input: DomRefCell<BufferQueue>,
     /// Input received from script. Used only to support document.write().
     #[ignore_malloc_size_of = "Defined in html5ever"]
+    #[no_trace]
     script_input: DomRefCell<BufferQueue>,
     /// The tokenizer of this parser.
     tokenizer: DomRefCell<Tokenizer>,
@@ -116,6 +118,7 @@ pub struct ServoParser {
     // building the DOM. https://github.com/servo/servo/pull/19203
     prefetch_tokenizer: DomRefCell<prefetch::Tokenizer>,
     #[ignore_malloc_size_of = "Defined in html5ever"]
+    #[no_trace]
     prefetch_input: DomRefCell<BufferQueue>,
 }
 
@@ -1046,6 +1049,7 @@ fn insert(
 #[derive(JSTraceable, MallocSizeOf)]
 #[unrooted_must_root_lint::must_root]
 pub struct Sink {
+    #[no_trace]
     base_url: ServoUrl,
     document: Dom<Document>,
     current_line: u64,
@@ -1401,6 +1405,7 @@ impl NetworkDecoder {
 
 #[derive(Default, JSTraceable)]
 struct NetworkSink {
+    #[no_trace]
     output: StrTendril,
 }