Add both sync and async methods for getting streams for a File

tools/testing/dart/status_file_parser.dart

Index: tools/testing/dart/status_file_parser.dart
diff --git a/tools/testing/dart/status_file_parser.dart b/tools/testing/dart/status_file_parser.dart
index 58e24831d55f2c2d489390d7f14cbcd02d3cc9b1..ec701111fe3cb5c942eee4a826e3ac1c58412c20 100644
--- a/tools/testing/dart/status_file_parser.dart
+++ b/tools/testing/dart/status_file_parser.dart
@@ -59,7 +59,14 @@ void ReadConfigurationInto(path, sections, onDone) {
   if (!file.existsSync()) {
     throw new Exception('Cannot find test status file $path');
   }
-  InputStream file_stream = file.openInputStream();
+  // TODO(1797): When the checked in binary is updated to include the
+  // openInputStreamSync API remove this try/catch.
+  InputStream file_stream;
+  try {
+    file_stream = file.openInputStreamSync();
+  } catch (NoSuchMethodException e) {
+    file_stream = file.openInputStream();
+  }
   StringInputStream lines = new StringInputStream(file_stream);
 
   Section current = new Section.always();