add debugInterpreter option

Author: cpirich

blockly/src/dev/app.html.ejs

@@ -13,7 +13,12 @@
        (app === "webapp" && options.levelId.indexOf('ec_') === 0) ||
        (app === "studio" && options.levelId.indexOf('ec_') === 0) ||
        (app === "turtle" && options.levelId.indexOf('ec_') === 0)) { -%>
-  <script type="text/javascript" src="../js/jsinterpreter/acorn_interpreter.js"></script>
+  <% if (options.debugInterpreter) { -%>
+    <script type="text/javascript" src="../js/jsinterpreter/acorn.js"></script>
+    <script type="text/javascript" src="../js/jsinterpreter/interpreter.js"></script>
+  <% } else { -%>
+    <script type="text/javascript" src="../js/jsinterpreter/acorn_interpreter.js"></script>
+  <% } -%>
   <script type="text/javascript" src="../js/requirejs/require.js"></script>
   <script type="text/javascript" src="../js/ace/ace.js"></script>
   <script type="text/javascript" src="../js/ace/ext-language_tools.js"></script>

blockly/src/dev/server.js

@@ -31,6 +31,7 @@ var renderApp = function(app, req, res) {
       containerId: 'blocklyApp',
       levelId: req.query.level,
       skinId: req.query.skin,
+      debugInterpreter: req.query.debugInterpreter,
       baseUrl: baseUrl(req),
       cacheBust: false // or 'test-string'
     }