Add StackOverflowError and expose error type to api.

src/mirror-debugger.js

 // Copyright 2006-2012 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 624 matching lines @@
   var elementNames;
   var total = 0;
 
   // Find all the named properties.
   if (kind & PropertyKind.Named) {
     // Get all the local property names.
     propertyNames =
         %GetLocalPropertyNames(this.value_, PROPERTY_ATTRIBUTES_NONE);
     total += propertyNames.length;
 
+    // TODO(dcarney): handle symbols correctly.
+    // Remove symbols from total.
+    for (var i = 0; i < propertyNames.length; i++) {
+      if (IS_SYMBOL(propertyNames[i])) total--;
+    }
+
     // Get names for named interceptor properties if any.
     if (this.hasNamedInterceptor() && (kind & PropertyKind.Named)) {
       var namedInterceptorNames =
           %GetNamedInterceptorPropertyNames(this.value_);
       if (namedInterceptorNames) {
         propertyNames = propertyNames.concat(namedInterceptorNames);
         total += namedInterceptorNames.length;
       }
     }
   }
@@ skipping 15 matching lines @@
     }
   }
   limit = Math.min(limit || total, total);
 
   var names = new Array(limit);
   var index = 0;
 
   // Copy names for named properties.
   if (kind & PropertyKind.Named) {
     for (var i = 0; index < limit && i < propertyNames.length; i++) {
+      if (IS_SYMBOL(propertyNames[i])) continue;  // Skip symbols.
       names[index++] = propertyNames[i];
     }
   }
 
   // Copy names for indexed properties.
   if (kind & PropertyKind.Indexed) {
     for (var i = 0; index < limit && i < elementNames.length; i++) {
       names[index++] = elementNames[i];
     }
   }
@@ skipping 1955 matching lines @@
   }
   if (!NUMBER_IS_FINITE(value)) {
     if (value > 0) {
       return 'Infinity';
     } else {
       return '-Infinity';
     }
   }
   return value;
 }