[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..2c284efa17cff77b475015a14fe674bc37166823 100644
--- a/runtime/bin/file.cc
+++ b/runtime/bin/file.cc
@@ -76,6 +76,19 @@ void FUNCTION_NAME(File_SetPointer)(Dart_NativeArguments args) {
 }
 
 
+void FUNCTION_NAME(File_SetTranslation)(Dart_NativeArguments args) {
+  File* file = GetFile(args);
+  ASSERT(file != NULL);
+  intptr_t translation =
+      DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 1));

[siva, 2017/02/22 00:58:45]

Dart_GetNativeIntegerArgument might work here, just one transition into the VM.

[zra, 2017/02/22 05:07:15]

Done.

+  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));