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

vm/ast.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_AST_H_
 #define VM_AST_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
@@ skipping 1475 matching lines @@
 };
 
 
 // The body of a Dart function marked as 'native' consists of this node.
 class NativeBodyNode : public AstNode {
  public:
   NativeBodyNode(intptr_t token_index,
                  const String& native_c_function_name,
                  NativeFunction native_c_function,
                  int argument_count,
-                 bool has_optional_parameters)
+                 bool has_optional_parameters,
+                 bool is_native_instance_closure)
       : AstNode(token_index),
         native_c_function_name_(native_c_function_name),
         native_c_function_(native_c_function),
         argument_count_(argument_count),
-        has_optional_parameters_(has_optional_parameters) {
+        has_optional_parameters_(has_optional_parameters),
+        is_native_instance_closure_(is_native_instance_closure) {
     ASSERT(native_c_function_ != NULL);
     ASSERT(native_c_function_name_.IsZoneHandle());
     ASSERT(native_c_function_name_.IsSymbol());
   }
 
   const String& native_c_function_name() const {
     return native_c_function_name_;
   }
   NativeFunction native_c_function() const { return native_c_function_; }
   int argument_count() const { return argument_count_; }
   bool has_optional_parameters() const {
     return has_optional_parameters_;
   }
+  bool is_native_instance_closure() const {
+    return is_native_instance_closure_;
+  }
 
   virtual void VisitChildren(AstNodeVisitor* visitor) const { }
 
   DECLARE_COMMON_NODE_FUNCTIONS(NativeBodyNode);
 
  private:
   const String& native_c_function_name_;
   NativeFunction native_c_function_;  // Actual non-Dart implementation.
   const int argument_count_;  // Native Dart function argument count.
   const bool has_optional_parameters_;  // Native Dart function kind.
+  const bool is_native_instance_closure_;  // An implicit native closure.
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(NativeBodyNode);
 };
 
 
 class CatchClauseNode : public AstNode {
  public:
   static const int kInvalidTryIndex = -1;
 
   CatchClauseNode(intptr_t token_index,
@@ skipping 135 matching lines @@
   const LocalVariable& context_var_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(InlinedFinallyNode);
 };
 
 }  // namespace dart
 
 #undef DECLARE_COMMON_NODE_FUNCTIONS
 
 #endif  // VM_AST_H_