export underlying wrapper for interop

Author: kevzoid

lib/chrome.js

@@ -242,27 +242,28 @@ class Chrome extends EventEmitter {
     // establish the connection wrapper and start processing user commands
     _connect() {
         return new Promise((fulfill, reject) => {
-            let wrapper;
             try {
-                wrapper = this.process ? this._createStdioWrapper() : this._createWebSocketWrapper();
+                this._wrapper = this.process
+                    ? this._createStdioWrapper()
+                    : this._createWebSocketWrapper();
             } catch (err) {
                 // handle missing stdio streams, bad URLs...
                 reject(err);
                 return;
             }
             // set up event handlers
-            wrapper.on('open', () => {
+            this._wrapper.on('open', () => {
                 fulfill();
             });
-            wrapper.on('message', (data) => {
+            this._wrapper.on('message', (data) => {
                 const message = JSON.parse(data);
                 this._handleMessage(message);
             });
-            wrapper.on('close', (code) => {
+            this._wrapper.on('close', (code) => {
                 this._handleConnectionClose();
                 this.emit('disconnect');
             });
-            wrapper.on('error', (err) => {
+            this._wrapper.on('error', (err) => {
                 reject(err);
             });
         });
@@ -334,6 +335,7 @@ class Chrome extends EventEmitter {
             }
         });
     }
+    get wrapper(){ return this._wrapper; }
 }
 
 module.exports = Chrome;