Implemented paint worklets invoking worklet scripts.

components/script/dom/paintsize.rs

@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use app_units::Au;
+use dom::bindings::codegen::Bindings::PaintSizeBinding;
+use dom::bindings::codegen::Bindings::PaintSizeBinding::PaintSizeMethods;
+use dom::bindings::js::Root;
+use dom::bindings::num::Finite;
+use dom::bindings::reflector::Reflector;
+use dom::bindings::reflector::reflect_dom_object;
+use dom::paintworkletglobalscope::PaintWorkletGlobalScope;
+use dom_struct::dom_struct;
+use euclid::Size2D;
+
+#[dom_struct]
+pub struct PaintSize {
+    reflector: Reflector,
+    width: Finite<f64>,
+    height: Finite<f64>,
+}
+
+impl PaintSize {
+    fn new_inherited(size: Size2D<Au>) -> PaintSize {
+        PaintSize {
+            reflector: Reflector::new(),
+            width: Finite::wrap(size.width.to_px().abs() as f64),
+            height: Finite::wrap(size.height.to_px().abs() as f64),
+        }
+    }
+
+    pub fn new(global: &PaintWorkletGlobalScope, size: Size2D<Au>) -> Root<PaintSize> {
+        reflect_dom_object(box PaintSize::new_inherited(size), global, PaintSizeBinding::Wrap)
+    }
+}
+
+impl PaintSizeMethods for PaintSize {
+    /// https://drafts.css-houdini.org/css-paint-api/#paintsize
+    fn Width(&self) -> Finite<f64> {
+        self.width
+    }
+
+    /// https://drafts.css-houdini.org/css-paint-api/#paintsize
+    fn Height(&self) -> Finite<f64> {
+        self.height
+    }
+}