DevTools: Show preview for ES6 MapIterator, SetIterator in console.

Source/bindings/core/v8/DebuggerScript.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 67 matching lines @@
     for (var i = 0; i < count; i++) {
         var scopeDetails = mirror.scope(i).details();
         result[i] = {
             type: scopeDetails.type(),
             object: DebuggerScript._buildScopeObject(scopeDetails.type(), scopeDetails.object())
         };
     }
     return result;
 }
 
 DebuggerScript.getCollectionEntries = function(object)

[yurys, 2014/11/10 07:38:03]

We should pick a better name for the method as not it accepts iterator too.

 {
     var mirror = MakeMirror(object, true /* transient */);
     if (mirror.isMap())
         return mirror.entries();
-    if (mirror.isSet()) {
+    if (mirror.isSet() || mirror.isIterator()) {
         var result = [];
-        var values = mirror.values();
+        var values = mirror.isSet() ? mirror.values() : mirror.preview();
         for (var i = 0; i < values.length; ++i)
             result.push({ value: values[i] });
         return result;
     }
 }
 
 DebuggerScript.getInternalProperties = function(value)
 {
     var properties = ObjectMirror.GetInternalProperties(value);
     var result = [];
@@ skipping 433 matching lines @@
         "parentPromise": eventData.parentPromise().value(),
         "status": eventData.status()
     };
 }
 
 // We never resolve Mirror by its handle so to avoid memory leaks caused by Mirrors in the cache we disable it.
 ToggleMirrorCache(false);
 
 return DebuggerScript;
 })();