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

11 files changed, 41 insertions, 11 deletions

diff --git a/components/script/task_source/dom_manipulation.rs b/components/script/task_source/dom_manipulation.rs
index d9dcdfb2472..68316b79fe3 100644
--- a/components/script/task_source/dom_manipulation.rs
+++ b/components/script/task_source/dom_manipulation.rs
@@ -16,7 +16,7 @@ use std::fmt;
 use std::result::Result;
 
 #[derive(JSTraceable)]
-pub struct DOMManipulationTaskSource(pub Box<dyn ScriptChan + Send>, pub PipelineId);
+pub struct DOMManipulationTaskSource(pub Box<dyn ScriptChan + Send>, #[no_trace] pub PipelineId);
 
 impl Clone for DOMManipulationTaskSource {
     fn clone(&self) -> DOMManipulationTaskSource {
diff --git a/components/script/task_source/file_reading.rs b/components/script/task_source/file_reading.rs
index 20b49a239b4..646778ffea5 100644
--- a/components/script/task_source/file_reading.rs
+++ b/components/script/task_source/file_reading.rs
@@ -10,7 +10,10 @@ use crate::task_source::{TaskSource, TaskSourceName};
 use msg::constellation_msg::PipelineId;
 
 #[derive(JSTraceable)]
-pub struct FileReadingTaskSource(pub Box<dyn ScriptChan + Send + 'static>, pub PipelineId);
+pub struct FileReadingTaskSource(
+    pub Box<dyn ScriptChan + Send + 'static>,
+    #[no_trace] pub PipelineId,
+);
 
 impl Clone for FileReadingTaskSource {
     fn clone(&self) -> FileReadingTaskSource {
diff --git a/components/script/task_source/history_traversal.rs b/components/script/task_source/history_traversal.rs
index 0fdb428b845..ecabbddfa55 100644
--- a/components/script/task_source/history_traversal.rs
+++ b/components/script/task_source/history_traversal.rs
@@ -10,7 +10,10 @@ use crossbeam_channel::Sender;
 use msg::constellation_msg::PipelineId;
 
 #[derive(Clone, JSTraceable)]
-pub struct HistoryTraversalTaskSource(pub Sender<MainThreadScriptMsg>, pub PipelineId);
+pub struct HistoryTraversalTaskSource(
+    #[no_trace] pub Sender<MainThreadScriptMsg>,
+    #[no_trace] pub PipelineId,
+);
 
 impl TaskSource for HistoryTraversalTaskSource {
     const NAME: TaskSourceName = TaskSourceName::HistoryTraversal;
diff --git a/components/script/task_source/media_element.rs b/components/script/task_source/media_element.rs
index c0a902b373b..16922a0ec87 100644
--- a/components/script/task_source/media_element.rs
+++ b/components/script/task_source/media_element.rs
@@ -18,7 +18,10 @@ use std::fmt;
 use std::result::Result;
 
 #[derive(Clone, JSTraceable)]
-pub struct MediaElementTaskSource(pub Sender<MainThreadScriptMsg>, pub PipelineId);
+pub struct MediaElementTaskSource(
+    #[no_trace] pub Sender<MainThreadScriptMsg>,
+    #[no_trace] pub PipelineId,
+);
 
 impl fmt::Debug for MediaElementTaskSource {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
diff --git a/components/script/task_source/networking.rs b/components/script/task_source/networking.rs
index 92d04b29220..0193cb22839 100644
--- a/components/script/task_source/networking.rs
+++ b/components/script/task_source/networking.rs
@@ -8,7 +8,10 @@ use crate::task_source::{TaskSource, TaskSourceName};
 use msg::constellation_msg::PipelineId;
 
 #[derive(JSTraceable)]
-pub struct NetworkingTaskSource(pub Box<dyn ScriptChan + Send + 'static>, pub PipelineId);
+pub struct NetworkingTaskSource(
+    pub Box<dyn ScriptChan + Send + 'static>,
+    #[no_trace] pub PipelineId,
+);
 
 impl Clone for NetworkingTaskSource {
     fn clone(&self) -> NetworkingTaskSource {
diff --git a/components/script/task_source/performance_timeline.rs b/components/script/task_source/performance_timeline.rs
index 1669ac6e689..58e2660e6fd 100644
--- a/components/script/task_source/performance_timeline.rs
+++ b/components/script/task_source/performance_timeline.rs
@@ -16,7 +16,10 @@ use std::fmt;
 use std::result::Result;
 
 #[derive(JSTraceable)]
-pub struct PerformanceTimelineTaskSource(pub Box<dyn ScriptChan + Send + 'static>, pub PipelineId);
+pub struct PerformanceTimelineTaskSource(
+    pub Box<dyn ScriptChan + Send + 'static>,
+    #[no_trace] pub PipelineId,
+);
 
 impl Clone for PerformanceTimelineTaskSource {
     fn clone(&self) -> PerformanceTimelineTaskSource {
diff --git a/components/script/task_source/port_message.rs b/components/script/task_source/port_message.rs
index e9d1766f521..e21230f8099 100644
--- a/components/script/task_source/port_message.rs
+++ b/components/script/task_source/port_message.rs
@@ -9,7 +9,10 @@ use msg::constellation_msg::PipelineId;
 use std::fmt;
 
 #[derive(JSTraceable)]
-pub struct PortMessageQueue(pub Box<dyn ScriptChan + Send + 'static>, pub PipelineId);
+pub struct PortMessageQueue(
+    pub Box<dyn ScriptChan + Send + 'static>,
+    #[no_trace] pub PipelineId,
+);
 
 impl Clone for PortMessageQueue {
     fn clone(&self) -> PortMessageQueue {
diff --git a/components/script/task_source/remote_event.rs b/components/script/task_source/remote_event.rs
index a1d54604996..91e132ed719 100644
--- a/components/script/task_source/remote_event.rs
+++ b/components/script/task_source/remote_event.rs
@@ -8,7 +8,10 @@ use crate::task_source::{TaskSource, TaskSourceName};
 use msg::constellation_msg::PipelineId;
 
 #[derive(JSTraceable)]
-pub struct RemoteEventTaskSource(pub Box<dyn ScriptChan + Send + 'static>, pub PipelineId);
+pub struct RemoteEventTaskSource(
+    pub Box<dyn ScriptChan + Send + 'static>,
+    #[no_trace] pub PipelineId,
+);
 
 impl Clone for RemoteEventTaskSource {
     fn clone(&self) -> RemoteEventTaskSource {
diff --git a/components/script/task_source/timer.rs b/components/script/task_source/timer.rs
index cd134fb12a2..9c4d03bdda5 100644
--- a/components/script/task_source/timer.rs
+++ b/components/script/task_source/timer.rs
@@ -10,7 +10,10 @@ use std::fmt;
 
 #[derive(JSTraceable)]
 /// https://html.spec.whatwg.org/multipage/#timer-task-source
-pub struct TimerTaskSource(pub Box<dyn ScriptChan + Send + 'static>, pub PipelineId);
+pub struct TimerTaskSource(
+    pub Box<dyn ScriptChan + Send + 'static>,
+    #[no_trace] pub PipelineId,
+);
 
 impl Clone for TimerTaskSource {
     fn clone(&self) -> TimerTaskSource {
diff --git a/components/script/task_source/user_interaction.rs b/components/script/task_source/user_interaction.rs
index bb434ab7026..1f543d88cfd 100644
--- a/components/script/task_source/user_interaction.rs
+++ b/components/script/task_source/user_interaction.rs
@@ -18,7 +18,10 @@ use std::fmt;
 use std::result::Result;
 
 #[derive(Clone, JSTraceable)]
-pub struct UserInteractionTaskSource(pub Sender<MainThreadScriptMsg>, pub PipelineId);
+pub struct UserInteractionTaskSource(
+    #[no_trace] pub Sender<MainThreadScriptMsg>,
+    #[no_trace] pub PipelineId,
+);
 
 impl fmt::Debug for UserInteractionTaskSource {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
diff --git a/components/script/task_source/websocket.rs b/components/script/task_source/websocket.rs
index f4e153328b9..843a9632a8a 100644
--- a/components/script/task_source/websocket.rs
+++ b/components/script/task_source/websocket.rs
@@ -8,7 +8,10 @@ use crate::task_source::{TaskSource, TaskSourceName};
 use msg::constellation_msg::PipelineId;
 
 #[derive(JSTraceable)]
-pub struct WebsocketTaskSource(pub Box<dyn ScriptChan + Send + 'static>, pub PipelineId);
+pub struct WebsocketTaskSource(
+    pub Box<dyn ScriptChan + Send + 'static>,
+    #[no_trace] pub PipelineId,
+);
 
 impl Clone for WebsocketTaskSource {
     fn clone(&self) -> WebsocketTaskSource {