servo: Merge #11410 - Remove the script listener thread (from Ms2ger:script-listener-thread); r=nox

Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data:
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy --faster` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

Either:
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because refactoring

Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process.

Source-Repo: https://github.com/servo/servo
Source-Revision: 1640ade0b3f703b54c2c2285271d44a037f7eabc

servo/components/script_traits/script_msg.rs

@@ -11,9 +11,10 @@ use MozBrowserEvent;
 use canvas_traits::CanvasMsg;
 use euclid::point::Point2D;
 use euclid::size::Size2D;
+use gfx_traits::LayerId;
 use ipc_channel::ipc::IpcSender;
-use msg::constellation_msg::{LoadData, SubpageId};
-use msg::constellation_msg::{NavigationDirection, PipelineId};
+use msg::constellation_msg::{Key, KeyModifiers, KeyState, LoadData};
+use msg::constellation_msg::{NavigationDirection, PipelineId, SubpageId};
 use offscreen_gl_context::{GLContextAttributes, GLLimits};
 use style_traits::cursor::Cursor;
 use style_traits::viewport::ViewportConstraints;
@@ -30,6 +31,15 @@ pub enum LayoutMsg {
     ViewportConstrained(PipelineId, ViewportConstraints),
 }
 
+/// Whether a DOM event was prevented by web content
+#[derive(Deserialize, Serialize)]
+pub enum EventResult {
+    /// Allowed by web content
+    DefaultAllowed,
+    /// Prevented by web content
+    DefaultPrevented,
+}
+
 /// Messages from the script to the constellation.
 #[derive(Deserialize, Serialize)]
 pub enum ScriptMsg {
@@ -83,4 +93,23 @@ pub enum ScriptMsg {
     SetFinalUrl(PipelineId, Url),
     /// Check if an alert dialog box should be presented
     Alert(PipelineId, String, IpcSender<bool>),
+    /// Scroll a page in a window
+    ScrollFragmentPoint(PipelineId, LayerId, Point2D<f32>, bool),
+    /// Set title of current page
+    /// https://html.spec.whatwg.org/multipage/#document.title
+    SetTitle(PipelineId, Option<String>),
+    /// Send a key event
+    SendKeyEvent(Key, KeyState, KeyModifiers),
+    /// Get Window Informations size and position
+    GetClientWindow(IpcSender<(Size2D<u32>, Point2D<i32>)>),
+    /// Move the window to a point
+    MoveTo(Point2D<i32>),
+    /// Resize the window to size
+    ResizeTo(Size2D<u32>),
+    /// Script has handled a touch event, and either prevented or allowed default actions.
+    TouchEventProcessed(EventResult),
+    /// Get Scroll Offset
+    GetScrollOffset(PipelineId, LayerId, IpcSender<Point2D<f32>>),
+    /// Requests that the compositor shut down.
+    Exit,
 }