script: Eliminate code duplication in the task queue (#34798)

Instead of creating a type for each `TaskSource` variety have each `TaskSource`
hold the same kind of sender (this was inconsistent before, but each
sender was effectively the same trait object), a pipeline, and a
`TaskSourceName`. This elminates the need to reimplement the same
queuing code for every task source.

In addition, have workers hold their own `TaskManager`. This allows just
exposing the manager on the `GlobalScope`. Currently the `TaskCanceller`
is different, but this will also be eliminated in a followup change.

This is a the first step toward having a shared set of `Sender`s on
`GlobalScope`.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/components/script/messaging.rs b/components/script/messaging.rs
index 76bd536b18c..af768222fd6 100644
--- a/components/script/messaging.rs
+++ b/components/script/messaging.rs
@@ -235,7 +235,7 @@ impl ScriptChan for SendableMainThreadScriptChan {
         self.0.send(msg).map_err(|_| ())
     }
 
-    fn as_boxed(&self) -> Box<dyn ScriptChan + Send> {
+    fn as_boxed(&self) -> Box<dyn ScriptChan> {
         Box::new(SendableMainThreadScriptChan((self.0).clone()))
     }
 }
@@ -251,7 +251,7 @@ impl ScriptChan for MainThreadScriptChan {
             .map_err(|_| ())
     }
 
-    fn as_boxed(&self) -> Box<dyn ScriptChan + Send> {
+    fn as_boxed(&self) -> Box<dyn ScriptChan> {
         Box::new(MainThreadScriptChan((self.0).clone()))
     }
 }