Include basic scopes information in 'backtrace' response

src/mirror-delay.js

Index: src/mirror-delay.js
===================================================================
--- src/mirror-delay.js	(revision 2226)
+++ src/mirror-delay.js	(working copy)
@@ -2232,6 +2232,15 @@
   if (!IS_UNDEFINED(source_line_text)) {
     content.sourceLineText = source_line_text;
   }
+  
+  content.scopes = [];
+  for (var i = 0; i < mirror.scopeCount(); i++) {
+    var scope = mirror.scope(i);
+    content.scopes.push({
+      type: scope.scopeType(),
+      index: i
+    });
+  }
 }