Allow the native resolver to setup whether it needs the Dart API scope to

samples/sample_extension/sample_extension.cc

 // 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.
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
-Dart_NativeFunction ResolveName(Dart_Handle name, int argc);
+Dart_NativeFunction ResolveName(Dart_Handle name,
+                                int argc,
+                                bool* auto_setup_scope);
 
 DART_EXPORT Dart_Handle sample_extension_Init(Dart_Handle parent_library) {
   if (Dart_IsError(parent_library)) { return parent_library; }
 
   Dart_Handle result_code = Dart_SetNativeResolver(parent_library, ResolveName);
   if (Dart_IsError(result_code)) return result_code;
 
   return Dart_Null();
 }
 
@@ skipping 91 matching lines @@
   const char* name;
   Dart_NativeFunction function;
 };
 
 FunctionLookup function_list[] = {
     {"SystemRand", SystemRand},
     {"SystemSrand", SystemSrand},
     {"RandomArray_ServicePort", randomArrayServicePort},
     {NULL, NULL}};
 
-Dart_NativeFunction ResolveName(Dart_Handle name, int argc) {
+Dart_NativeFunction ResolveName(Dart_Handle name,
+                                int argc,
+                                bool* auto_setup_scope) {
   if (!Dart_IsString(name)) return NULL;
   Dart_NativeFunction result = NULL;
+  if (auto_setup_scope == NULL) return NULL;
+  *auto_setup_scope = true;
   Dart_EnterScope();
   const char* cname;
   HandleError(Dart_StringToCString(name, &cname));
 
   for (int i=0; function_list[i].name != NULL; ++i) {
     if (strcmp(function_list[i].name, cname) == 0) {
       result = function_list[i].function;
       break;
     }
   }
   Dart_ExitScope();
   return result;
 }