Make first argument of DOMManipulationTaskSource as a Box<ScriptChan +

Send>

We don't have `window` for `workers`. So, if we use `global.as_window()`
to get the DOMManipulationTaskSource, it will make worker panic.
Instead, we should get the DOMManipulationTaskSource from each own
thread.

Ref: https://github.com/servo/servo/pull/20755#discussion_r193557746

2 files changed, 16 insertions, 0 deletions

diff --git a/components/script/dom/globalscope.rs b/components/script/dom/globalscope.rs
index c38a5869d61..a3e879326bc 100644
--- a/components/script/dom/globalscope.rs
+++ b/components/script/dom/globalscope.rs
@@ -56,6 +56,7 @@ use std::sync::Arc;
 use std::sync::atomic::{AtomicBool, Ordering};
 use task::TaskCanceller;
 use task_source::TaskSourceName;
+use task_source::dom_manipulation::DOMManipulationTaskSource;
 use task_source::file_reading::FileReadingTaskSource;
 use task_source::networking::NetworkingTaskSource;
 use task_source::performance_timeline::PerformanceTimelineTaskSource;
@@ -680,6 +681,16 @@ impl GlobalScope {
         unreachable!();
     }
 
+    pub fn dom_manipulation_task_source(&self) -> DOMManipulationTaskSource {
+        if let Some(window) = self.downcast::<Window>() {
+            return window.dom_manipulation_task_source();
+        }
+        if let Some(worker) = self.downcast::<WorkerGlobalScope>() {
+            return worker.dom_manipulation_task_source();
+        }
+        unreachable!();
+    }
+
     /// Channel to send messages to the file reading task source of
     /// this of this global scope.
     pub fn file_reading_task_source(&self) -> FileReadingTaskSource {
diff --git a/components/script/dom/workerglobalscope.rs b/components/script/dom/workerglobalscope.rs
index fa2d0a449cf..edcdb329af8 100644
--- a/components/script/dom/workerglobalscope.rs
+++ b/components/script/dom/workerglobalscope.rs
@@ -43,6 +43,7 @@ use std::rc::Rc;
 use std::sync::Arc;
 use std::sync::atomic::{AtomicBool, Ordering};
 use task::TaskCanceller;
+use task_source::dom_manipulation::DOMManipulationTaskSource;
 use task_source::file_reading::FileReadingTaskSource;
 use task_source::networking::NetworkingTaskSource;
 use task_source::performance_timeline::PerformanceTimelineTaskSource;
@@ -419,6 +420,10 @@ impl WorkerGlobalScope {
         }
     }
 
+    pub fn dom_manipulation_task_source(&self) -> DOMManipulationTaskSource {
+        DOMManipulationTaskSource(self.script_chan(), self.pipeline_id())
+    }
+
     pub fn file_reading_task_source(&self) -> FileReadingTaskSource {
         FileReadingTaskSource(self.script_chan(), self.pipeline_id())
     }