Support "..." VM frames in pkg/stack_trace.

pkg/stack_trace/test/frame_test.dart

Index: pkg/stack_trace/test/frame_test.dart
diff --git a/pkg/stack_trace/test/frame_test.dart b/pkg/stack_trace/test/frame_test.dart
index 75302a7a865442dc7c142e72a1d148a939697daf..0be717da0552f8eacf8166b0f5944ff3dcfabd3e 100644
--- a/pkg/stack_trace/test/frame_test.dart
+++ b/pkg/stack_trace/test/frame_test.dart
@@ -29,6 +29,15 @@ void main() {
           equals('<fn>.<fn>.bar'));
     });
 
+    test('parses a folded frame correctly', () {
+      var frame = new Frame.parseVM('...');
+
+      expect(frame.member, equals('...'));
+      expect(frame.uri, equals(new Uri()));
+      expect(frame.line, isNull);
+      expect(frame.column, isNull);
+    });
+
     test('throws a FormatException for malformed frames', () {
       expect(() => new Frame.parseVM(''), throwsFormatException);
       expect(() => new Frame.parseVM('#1'), throwsFormatException);