Add WebIDL support for the object type

This maps to the `Object` type in the `js_sys` crate.

crates/web-sys/tests/wasm/dom_point.rs

@@ -0,0 +1,33 @@
+use wasm_bindgen::JsValue;
+use wasm_bindgen_test::*;
+use web_sys::{DomPoint, DomPointReadOnly};
+
+#[wasm_bindgen_test]
+fn dom_point() {
+    let x = DomPoint::new(1.0, 2.0, 3.0, 4.0).unwrap();
+    assert_eq!(x.x(), 1.0);
+    x.set_x(1.5);
+    assert_eq!(x.x(), 1.5);
+
+    assert_eq!(x.y(), 2.0);
+    x.set_y(2.5);
+    assert_eq!(x.y(), 2.5);
+
+    assert_eq!(x.z(), 3.0);
+    x.set_z(3.5);
+    assert_eq!(x.z(), 3.5);
+
+    assert_eq!(x.w(), 4.0);
+    x.set_w(4.5);
+    assert_eq!(x.w(), 4.5);
+}
+
+#[wasm_bindgen_test]
+fn dom_point_readonly() {
+    let x = DomPoint::new(1.0, 2.0, 3.0, 4.0).unwrap();
+    let x = DomPointReadOnly::from(JsValue::from(x));
+    assert_eq!(x.x(), 1.0);
+    assert_eq!(x.y(), 2.0);
+    assert_eq!(x.z(), 3.0);
+    assert_eq!(x.w(), 4.0);
+}

crates/web-sys/tests/wasm/main.rs

@@ -50,3 +50,5 @@ pub mod style_element;
 pub mod table_element;
 pub mod title_element;
 pub mod xpath_result;
+pub mod dom_point;
+pub mod performance;

crates/web-sys/tests/wasm/option_element.rs

@@ -1,5 +1,4 @@
 use wasm_bindgen_test::*;
-use wasm_bindgen::prelude::*;
 use web_sys::HtmlOptionElement;
 
 #[wasm_bindgen_test]
@@ -41,4 +40,4 @@ fn test_option_element() {
     assert_eq!(option.text(), "potato", "Option should have the text we gave it.");
 
     assert_eq!(option.index(), 0, "This should be the first option, since there are no other known options.");
-}
+}

crates/web-sys/tests/wasm/performance.rs

@@ -0,0 +1,15 @@
+use wasm_bindgen::prelude::*;
+use wasm_bindgen_test::*;
+use web_sys::Performance;
+
+#[wasm_bindgen]
+extern {
+    #[wasm_bindgen(js_name = performance)]
+    static PERFORMANCE: Performance;
+}
+
+#[wasm_bindgen_test]
+fn to_json() {
+    let perf = JsValue::from(PERFORMANCE.to_json());
+    assert!(perf.is_object());
+}