CodeMirrorGadget: Add getSupportedTypeList Method

gadget/codemirror.gadget.js

@@ -108,6 +108,15 @@
       this.editor.focus();
     })
 
+    .declareMethod('getSupportedTypeList', function () {
+      var result_list = [], key;
+      for (key in CodeMirror.mimeModes) {
+        if (CodeMirror.mimeModes.hasOwnProperty(key)) {
+          result_list.push(key);
+        }
+      }
+      return result_list;
+    })
     .declareMethod('getContent', function () {
       var form_data = {};
       if (this.state.editable) {