Implemented paint worklets invoking worklet scripts.

components/script/dom/paintrenderingcontext2d.rs

@@ -0,0 +1,29 @@
+/* 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 dom::bindings::codegen::Bindings::PaintRenderingContext2DBinding;
+use dom::bindings::js::Root;
+use dom::bindings::reflector::Reflector;
+use dom::bindings::reflector::reflect_dom_object;
+use dom::paintworkletglobalscope::PaintWorkletGlobalScope;
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct PaintRenderingContext2D {
+    reflector: Reflector,
+}
+
+impl PaintRenderingContext2D {
+    fn new_inherited() -> PaintRenderingContext2D {
+        PaintRenderingContext2D {
+            reflector: Reflector::new(),
+        }
+    }
+
+    pub fn new(global: &PaintWorkletGlobalScope) -> Root<PaintRenderingContext2D> {
+        reflect_dom_object(box PaintRenderingContext2D::new_inherited(),
+                           global,
+                           PaintRenderingContext2DBinding::Wrap)
+    }
+}