[adapters] 增加小游戏适配部分源码

adapters/platforms/bytedance/wrapper/builtin/HTMLCanvasElement.js

@@ -0,0 +1,20 @@
+// import HTMLElement from './HTMLElement';
+
+// export default class HTMLCanvasElement extends HTMLElement
+// {
+//     constructor(){
+//         super('canvas')
+//     }
+// };
+
+import Canvas from './Canvas'
+import HTMLElement from './HTMLElement'
+
+GameGlobal.screencanvas = GameGlobal.screencanvas || new Canvas();
+const canvas = GameGlobal.screencanvas;
+
+const canvasConstructor = canvas.constructor;
+
+// canvasConstructor.__proto__.__proto__ = new HTMLElement();
+
+export default canvasConstructor;