Implement list based output stream and add pipe to list based input streams

runtime/bin/file_impl.dart

Index: runtime/bin/file_impl.dart
diff --git a/runtime/bin/file_impl.dart b/runtime/bin/file_impl.dart
index 60eef959111f01d46c62ccc72cb3c9e9b47f6c2f..61528246131343e55117e5c4d306e41dc7292184 100644
--- a/runtime/bin/file_impl.dart
+++ b/runtime/bin/file_impl.dart
@@ -128,7 +128,7 @@ class _FileOutputStream implements FileOutputStream {
     return _write(buffer, 0, buffer.length);
   }
 
-  bool writeFrom(List<int> buffer, [int offset, int len]) {
+  bool writeFrom(List<int> buffer, [int offset = 0, int len]) {
     return _write(
         buffer, offset, (len == null) ? buffer.length - offset : len);
   }