HTML: self.reportError()

For whatwg/html#1196.

html/webappapis/scripting/reporterror.any.js

@@ -0,0 +1,25 @@
+setup({ allow_uncaught_exception:true });
+
+[
+  1,
+  new TypeError(),
+  undefined
+].forEach(throwable => {
+  test(t => {
+    let happened = false;
+    self.addEventListener("error", t.step_func(e => {
+      assert_true(e.message !== "");
+      assert_equals(e.filename, new URL("reporterror.any.js", location.href).href);
+      assert_greater_than(e.lineno, 0);
+      assert_greater_than(e.colno, 0);
+      assert_equals(e.error, throwable);
+      happened = true;
+    }), { once:true });
+    self.reportError(throwable);
+    assert_true(happened);
+  }, `self.reportError(${throwable})`);
+});
+
+test(() => {
+  assert_throws_js(TypeError, () => self.reportError());
+}, `self.reportError() (without arguments) throws`);