Second step towards loading the core library scripts directly from the sources

runtime/bin/run_vm_tests.cc

Index: runtime/bin/run_vm_tests.cc
===================================================================
--- runtime/bin/run_vm_tests.cc	(revision 22375)
+++ runtime/bin/run_vm_tests.cc	(working copy)
@@ -8,8 +8,10 @@
 
 #include "vm/benchmark_test.h"
 #include "vm/dart.h"
+#include "bin/dartutils.h"
 #include "vm/unit_test.h"
 
+
 // TODO(iposva, asiva): This is a placeholder for the real unittest framework.
 namespace dart {
 
@@ -104,7 +106,10 @@
                                                              dart_argv);
   ASSERT(set_vm_flags_success);
   const char* err_msg = Dart::InitOnce(NULL, NULL, NULL, NULL,
-                                       NULL, NULL, NULL);
+                                       dart::bin::DartUtils::OpenFile,
+                                       dart::bin::DartUtils::ReadFile,
+                                       dart::bin::DartUtils::WriteFile,
+                                       dart::bin::DartUtils::CloseFile);
   ASSERT(err_msg == NULL);
   // Apply the filter to all registered tests.
   TestCaseBase::RunAll();