LibWeb: Introduce the WebGL namespace and add WebGLContextEvent

Author: https://github.com/Lubrsi
Commit: b0c2aee2e4
Pull-request: https://github.com/SerenityOS/serenity/pull/14184
Reviewed-by: https://github.com/Quaker762 ✅
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/linusg ✅
Reviewed-by: https://github.com/sunverwerth

Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.idl

@@ -0,0 +1,11 @@
+#import <DOM/Event.idl>
+
+[Exposed=(Window,Worker)]
+interface WebGLContextEvent : Event {
+    constructor(DOMString type, optional WebGLContextEventInit eventInit = {});
+    readonly attribute DOMString statusMessage;
+};
+
+dictionary WebGLContextEventInit : EventInit {
+    DOMString statusMessage = "";
+};