Implemented paint worklet properties.

components/script/dom/cssstylevalue.rs

@@ -0,0 +1,46 @@
+/* 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::CSSStyleValueBinding::CSSStyleValueMethods;
+use dom::bindings::codegen::Bindings::CSSStyleValueBinding::Wrap;
+use dom::bindings::js::Root;
+use dom::bindings::reflector::Reflector;
+use dom::bindings::reflector::reflect_dom_object;
+use dom::bindings::str::DOMString;
+use dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct CSSStyleValue {
+    reflector: Reflector,
+    value: String,
+}
+
+impl CSSStyleValue {
+    fn new_inherited(value: String) -> CSSStyleValue {
+        CSSStyleValue {
+            reflector: Reflector::new(),
+            value: value,
+        }
+    }
+
+    pub fn new(global: &GlobalScope, value: String) -> Root<CSSStyleValue> {
+        reflect_dom_object(box CSSStyleValue::new_inherited(value), global, Wrap)
+    }
+}
+
+impl CSSStyleValueMethods for CSSStyleValue {
+    /// https://drafts.css-houdini.org/css-typed-om-1/#CSSStyleValue-stringification-behavior
+    fn Stringifier(&self) -> DOMString {
+        DOMString::from(&*self.value)
+    }
+
+    /// This attribute is no longer part of the `CSSStyleValue` interface,
+    /// but is still used in some examples.
+    /// https://github.com/GoogleChrome/houdini-samples/issues/16
+    // check-tidy: no specs after this line
+    fn CssText(&self) -> DOMString {
+        self.Stringifier()
+    }
+}