add remix api bundle (for manual testing purpose)

src/app/plugin/bundle.js

+(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+'use strict';
+
+var _createClass = function () {
+  function defineProperties(target, props) {
+    for (var i = 0; i < props.length; i++) {
+      var descriptor = props[i];descriptor.enumerable = descriptor.enumerable || false;descriptor.configurable = true;if ("value" in descriptor) descriptor.writable = true;Object.defineProperty(target, descriptor.key, descriptor);
+    }
+  }return function (Constructor, protoProps, staticProps) {
+    if (protoProps) defineProperties(Constructor.prototype, protoProps);if (staticProps) defineProperties(Constructor, staticProps);return Constructor;
+  };
+}();
+
+function _classCallCheck(instance, Constructor) {
+  if (!(instance instanceof Constructor)) {
+    throw new TypeError("Cannot call a class as a function");
+  }
+}
+
+var RemixExtension = function () {
+  function RemixExtension() {
+    var _this = this;
+
+    _classCallCheck(this, RemixExtension);
+
+    this._notifications = {};
+    this._pendingRequests = {};
+    this._id = 0;
+    window.addEventListener('message', function (event) {
+      return _this._newMessage(event);
+    }, false);
+  }
+
+  _createClass(RemixExtension, [{
+    key: 'listen',
+    value: function listen(key, type, callback) {
+      if (!this._notifications[key]) this._notifications[key] = {};
+      this._notifications[key][type] = callback;
+    }
+  }, {
+    key: 'call',
+    value: function call(key, type, params, callback) {
+      this._id++;
+      this._pendingRequests[this._id] = callback;
+      window.parent.postMessage(JSON.stringify({
+        action: 'request',
+        key: key,
+        type: type,
+        value: params,
+        id: this._id
+      }), '*');
+    }
+  }, {
+    key: '_newMessage',
+    value: function _newMessage(event) {
+      if (!event.data) return;
+      if (typeof event.data !== 'string') return;
+
+      var msg;
+      try {
+        msg = JSON.parse(event.data);
+      } catch (e) {
+        return console.log('unable to parse data');
+      }
+      var _msg = msg,
+          action = _msg.action,
+          key = _msg.key,
+          type = _msg.type,
+          value = _msg.value;
+
+      if (action === 'notification') {
+        if (this._notifications[key] && this._notifications[key][type]) {
+          this._notifications[key][type](value);
+        }
+      } else if (action === 'response') {
+        var _msg2 = msg,
+            id = _msg2.id,
+            error = _msg2.error;
+
+        if (this._pendingRequests[id]) {
+          this._pendingRequests[id](error, value);
+          delete this._pendingRequests[id];
+        }
+      }
+    }
+  }]);
+
+  return RemixExtension;
+}();
+
+if (window) window.RemixExtension = RemixExtension;
+if (module && module.exports) module.exports = RemixExtension;
+
+},{}]},{},[1]);