[dart:io][windows] Make unicode characters display correctly.

runtime/bin/run_vm_tests.cc

Index: runtime/bin/run_vm_tests.cc
diff --git a/runtime/bin/run_vm_tests.cc b/runtime/bin/run_vm_tests.cc
index 784ee990d337c1998d216e05f76324f279e288b6..2749b14d592724e9bdf152c2adae4c65293ce70e 100644
--- a/runtime/bin/run_vm_tests.cc
+++ b/runtime/bin/run_vm_tests.cc
@@ -87,6 +87,11 @@ static int Main(int argc, const char** argv) {
   int dart_argc = 0;
   const char** dart_argv = NULL;
 
+  // Perform platform specific initialization.
+  if (!dart::bin::Platform::Initialize()) {
+    OS::PrintErr("Initialization failed\n");
+  }
+
   if (argc < 2) {
     // Bad parameter count.
     PrintUsage();