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

runtime/bin/builtin_natives.cc

Index: runtime/bin/builtin_natives.cc
===================================================================
--- runtime/bin/builtin_natives.cc	(revision 31283)
+++ runtime/bin/builtin_natives.cc	(working copy)
@@ -85,11 +85,14 @@
  * Looks up native functions in both libdart_builtin and libdart_io.
  */
 Dart_NativeFunction Builtin::NativeLookup(Dart_Handle name,
-                                          int argument_count) {
+                                          int argument_count,
+                                          bool* auto_setup_scope) {
   const char* function_name = NULL;
   Dart_Handle result = Dart_StringToCString(name, &function_name);
   DART_CHECK_VALID(result);
   ASSERT(function_name != NULL);
+  ASSERT(auto_setup_scope != NULL);
+  *auto_setup_scope = true;
   int num_entries = sizeof(BuiltinEntries) / sizeof(struct NativeEntries);
   for (int i = 0; i < num_entries; i++) {
     struct NativeEntries* entry = &(BuiltinEntries[i]);
@@ -98,7 +101,7 @@
       return reinterpret_cast<Dart_NativeFunction>(entry->function_);
     }
   }
-  return IONativeLookup(name, argument_count);
+  return IONativeLookup(name, argument_count, auto_setup_scope);
 }