Allow implicit 'close your eyes' of native methods. This will hopefully fix issue 3466.

vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1362 matching lines @@
   }
   void set_deoptimization_counter(intptr_t value) const {
     raw_ptr()->deoptimization_counter_ = value;
   }
 
   bool is_optimizable() const {
     return raw_ptr()->is_optimizable_;
   }
   void set_is_optimizable(bool value) const;
 
+  bool is_native() const { return raw_ptr()->is_native_; }
+  void set_is_native(bool value) const;
+
   bool HasOptimizedCode() const;
 
   intptr_t NumberOfParameters() const;
 
   bool AreValidArgumentCounts(int num_arguments, int num_named_arguments) const;
   bool AreValidArguments(int num_arguments, const Array& argument_names) const;
 
   // Fully qualified name uniquely identifying the function under gdb and during
   // ast printing. The special ':' character, if present, is replaced by '_'.
   const char* ToFullyQualifiedCString() const;
@@ skipping 3582 matching lines @@
 }
 
 
 intptr_t Stackmap::SizeInBits() const {
   return (Smi::Value(raw_ptr()->bitmap_size_in_bytes_) * kBitsPerByte);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_