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, 11 insertions, 0 deletions

diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 9a2b561adae..cedbbd5cc7e 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -166,13 +166,18 @@ pub struct WebGLRenderingContext {
     #[ignore_malloc_size_of = "Channels are hard"]
     webgl_sender: WebGLMessageSender,
     #[ignore_malloc_size_of = "Defined in webrender"]
+    #[no_trace]
     webrender_image: ImageKey,
+    #[no_trace]
     webgl_version: WebGLVersion,
+    #[no_trace]
     glsl_version: WebGLSLVersion,
     #[ignore_malloc_size_of = "Defined in surfman"]
+    #[no_trace]
     limits: GLLimits,
     canvas: Dom<HTMLCanvasElement>,
     #[ignore_malloc_size_of = "Defined in canvas_traits"]
+    #[no_trace]
     last_error: Cell<Option<WebGLError>>,
     texture_packing_alignment: Cell<u8>,
     texture_unpacking_settings: Cell<TextureUnpacking>,
@@ -190,6 +195,7 @@ pub struct WebGLRenderingContext {
     current_scissor: Cell<(i32, i32, u32, u32)>,
     #[ignore_malloc_size_of = "Because it's small"]
     current_clear_color: Cell<(f32, f32, f32, f32)>,
+    #[no_trace]
     size: Cell<Size2D<u32>>,
     extension_manager: WebGLExtensions,
     capabilities: Capabilities,
@@ -198,6 +204,7 @@ pub struct WebGLRenderingContext {
     default_vao_webgl2: DomOnceCell<WebGLVertexArrayObject>,
     current_vao_webgl2: MutNullableDom<WebGLVertexArrayObject>,
     textures: Textures,
+    #[no_trace]
     api_type: GlType,
 }
 
@@ -4886,7 +4893,9 @@ pub enum TexSource {
 
 #[derive(JSTraceable)]
 pub struct WebGLCommandSender {
+    #[no_trace]
     sender: WebGLChan,
+    #[no_trace]
     waker: Option<Box<dyn EventLoopWaker>>,
 }
 
@@ -4906,8 +4915,10 @@ impl WebGLCommandSender {
 
 #[derive(JSTraceable, MallocSizeOf)]
 pub(crate) struct WebGLMessageSender {
+    #[no_trace]
     sender: WebGLMsgSender,
     #[ignore_malloc_size_of = "traits are cumbersome"]
+    #[no_trace]
     waker: Option<Box<dyn EventLoopWaker>>,
 }