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

runtime/bin/file.cc

Index: runtime/bin/file.cc
diff --git a/runtime/bin/file.cc b/runtime/bin/file.cc
index feeb130fec57106d5851ef6b3fde0b32920e0b55..55ed95260d7936bb7a577c700df043824ae6f398 100644
--- a/runtime/bin/file.cc
+++ b/runtime/bin/file.cc
@@ -76,6 +76,22 @@ void FUNCTION_NAME(File_SetPointer)(Dart_NativeArguments args) {
 }
 
 
+void FUNCTION_NAME(File_SetTranslation)(Dart_NativeArguments args) {
+  File* file = GetFile(args);
+  ASSERT(file != NULL);
+  int64_t translation;
+  Dart_Handle status = Dart_GetNativeIntegerArgument(args, 1, &translation);
+  if (Dart_IsError(status)) {
+    Dart_PropagateError(status);
+  }
+  if ((translation != File::kText) && (translation != File::kBinary)) {
+    Dart_ThrowException(DartUtils::NewDartArgumentError(
+        "The argument must be a FileTranslation mode"));
+  }
+  file->SetTranslation(static_cast<File::DartFileTranslation>(translation));
+}
+
+
 void FUNCTION_NAME(File_Open)(Dart_NativeArguments args) {
   const char* filename =
       DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));