[adapters] 增加小游戏适配部分源码

adapters/platforms/xiaomi/index.js

@@ -0,0 +1,18 @@
+const _global = window;
+const adapter = _global.__globalAdapter = {};
+
+Object.assign(adapter, {
+    init () {
+        require('./wrapper/builtin');
+        _global.DOMParser = require('../../common/xmldom/dom-parser').DOMParser;
+        require('./wrapper/unify');
+        require('./wrapper/fs-utils');
+        require('../../common/engine/globalAdapter');
+        require('./wrapper/systemInfo');
+    },
+
+    adaptEngine () {
+        require('../../common/engine');
+        require('./wrapper/engine/');
+    },
+});