LibWeb: Add the Web::Crypto namespace, built-in, and getRandomValues

Since we don't support IDL typedefs or unions yet, the responsibility
of verifying the type of the argument is temporarily moved from the
generated Wrapper to the implementation.

Userland/Libraries/LibWeb/Crypto/Crypto.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/Value.h>
+#include <LibWeb/Bindings/Wrappable.h>
+#include <LibWeb/DOM/ExceptionOr.h>
+
+namespace Web::Crypto {
+
+class Crypto : public Bindings::Wrappable
+    , public RefCounted<Crypto>
+    , public Weakable<Crypto> {
+public:
+    using WrapperType = Bindings::CryptoWrapper;
+
+    static NonnullRefPtr<Crypto> create()
+    {
+        return adopt_ref(*new Crypto());
+    }
+
+    DOM::ExceptionOr<JS::Value> get_random_values(JS::Value array) const;
+
+private:
+    Crypto() = default;
+};
+
+}
+
+namespace Web::Bindings {
+
+CryptoWrapper* wrap(JS::GlobalObject&, Crypto::Crypto&);
+
+}