Support "[as ...]" in V8 stack traces 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 0be717da0552f8eacf8166b0f5944ff3dcfabd3e..26a0f21cd32754c87303c6faa087fde97ef29e7a 100644
--- a/pkg/stack_trace/test/frame_test.dart
+++ b/pkg/stack_trace/test/frame_test.dart
@@ -74,6 +74,18 @@ void main() {
       expect(frame.member, equals('<fn>'));
     });
 
+    test('parses a stack frame with [as ...] correctly', () {
+      // Ignore "[as ...]", since other stack trace formats don't support a
+      // similar construct.
+      var frame = new Frame.parseV8("    at VW.call\$0 [as call\$4] "
+          "(http://pub.dartlang.org/stuff.dart.js:560:28)");
+      expect(frame.uri,
+          equals(Uri.parse("http://pub.dartlang.org/stuff.dart.js")));
+      expect(frame.line, equals(560));
+      expect(frame.column, equals(28));
+      expect(frame.member, equals('VW.call\$0'));
+    });
+
     test('converts "<anonymous>" to "<fn>"', () {
       String parsedMember(String member) =>
           new Frame.parseV8('    at $member (foo:0:0)').member;