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

sdk/lib/io/file_impl.dart

Index: sdk/lib/io/file_impl.dart
diff --git a/sdk/lib/io/file_impl.dart b/sdk/lib/io/file_impl.dart
index 3ae67e3e91d1bb31f7a216cb6842892df5d3da96..1a69a0d4a9807178ccdcc947523cadb0b9f4ee14 100644
--- a/sdk/lib/io/file_impl.dart
+++ b/sdk/lib/io/file_impl.dart
@@ -643,8 +643,25 @@ abstract class _RandomAccessFileOps {
   length();
   flush();
   lock(int lock, int start, int end);
+  setTranslation(int translation);
 }
 
+
+/**
+ * The translation mode of a File.
+ *
+ * Whether the data written to a file should be interpreted as text
+ * or binary data. This distinction is only meaningful on platforms that
+ * recognize a difference, in particular on Windows.
+ */
+enum _FileTranslation {
+  /// Data should be interpreted as text.
+  text,
+  /// Data should be interpreted as binary data.
+  binary,
+}
+
+
 class _RandomAccessFile implements RandomAccessFile {
   static bool _connectedResourceHandler = false;
 
@@ -656,9 +673,12 @@ class _RandomAccessFile implements RandomAccessFile {
   _FileResourceInfo _resourceInfo;
   _RandomAccessFileOps _ops;
 
+  _FileTranslation _translation;
+
   _RandomAccessFile(int pointer, this.path) {
     _ops = new _RandomAccessFileOps(pointer);
     _resourceInfo = new _FileResourceInfo(this);
+    _translation = _FileTranslation.binary;
     _maybeConnectHandler();
   }
 
@@ -1059,6 +1079,15 @@ class _RandomAccessFile implements RandomAccessFile {
     }
   }
 
+  _FileTranslation get translation => _translation;
+
+  void set translation(_FileTranslation translation) {
+    if (_translation != translation) {
+      _ops.setTranslation(translation.index);
+      _translation = translation;
+    }
+  }
+
   bool closed = false;
 
   // Calling this function will increase the reference count on the native