[adapters] 增加小游戏适配部分源码

adapters/platforms/baidu/wrapper/engine/Texture2D.js

@@ -0,0 +1,24 @@
+if (cc.Texture2D) {
+    cc.Texture2D.prototype._checkPackable = function () {
+        let dynamicAtlas = cc.dynamicAtlasManager;
+        if (!dynamicAtlas) return;
+
+        if (this._isCompressed()) {
+            this._packable = false;
+            return;
+        }
+
+        let w = this.width, h = this.height;
+        if (!this._image ||
+            w > dynamicAtlas.maxFrameSize || h > dynamicAtlas.maxFrameSize || 
+            this._getHash() !== dynamicAtlas.Atlas.DEFAULT_HASH) {
+            this._packable = false;
+            return;
+        }
+
+        // HACK: Can't tell if it's a Canvas or an Image by instanceof on Baidu.
+        if (this._image && this._image.getContext) {
+            this._packable = true;
+        }
+    };
+}

adapters/platforms/baidu/wrapper/engine/index.js

@@ -0,0 +1 @@
+require('./Texture2D');