Additional HandleScopes to limit Handle consumption.

src/handles.h

Index: src/handles.h
diff --git a/src/handles.h b/src/handles.h
index eb57f0e26089383c9d7fe9f57a8cba5f41a111e2..f4172ba742267bd96732882de4224e5b0af8cfd0 100644
--- a/src/handles.h
+++ b/src/handles.h
@@ -208,6 +208,8 @@ class HandleScope {
 
   Isolate* isolate() { return isolate_; }
 
+  static const int kCheckHandleThreshold = 32 * 1024;
+
  private:
   // Prevent heap allocation or illegal handle scopes.
   HandleScope(const HandleScope&);