Add executable to Options interface to get the name of the executable used to execute the script.

tests/standalone/io/process_broken_pipe_test.dart

Index: tests/standalone/io/process_broken_pipe_test.dart
diff --git a/tests/standalone/io/process_broken_pipe_test.dart b/tests/standalone/io/process_broken_pipe_test.dart
index 440fda06c67d32dcb14dab384dd26ecbd2f53c15..8cb16903753e663d190893e8e6462d5fa55cc57f 100644
--- a/tests/standalone/io/process_broken_pipe_test.dart
+++ b/tests/standalone/io/process_broken_pipe_test.dart
@@ -10,7 +10,7 @@
 
 main() {
   // Running dart without arguments makes it close right away.
-  Process process = new Process.start(getDartFileName(), []);
+  Process process = new Process.start(new Options().executable, []);
 
   // Ignore error on stdin.
   process.stdin.onError = (e) => null;