Create an apptesting framework for dart.

third_party/dart-packages/stack_trace/stack_trace/src/vm_trace.dart

Index: third_party/dart-packages/stack_trace/stack_trace/src/vm_trace.dart
diff --git a/sky/tests/resources/third_party/stack_trace/src/vm_trace.dart b/third_party/dart-packages/stack_trace/stack_trace/src/vm_trace.dart
similarity index 81%
copy from sky/tests/resources/third_party/stack_trace/src/vm_trace.dart
copy to third_party/dart-packages/stack_trace/stack_trace/src/vm_trace.dart
index 811601529bbd8f018e7540aa2ec1f34ce47068bf..79911602ac7b59abadfc31d8315a8a17eb93c186 100644
--- a/sky/tests/resources/third_party/stack_trace/src/vm_trace.dart
+++ b/third_party/dart-packages/stack_trace/stack_trace/src/vm_trace.dart
@@ -22,7 +22,10 @@ class VMTrace implements StackTrace {
     var i = 1;
     return frames.map((frame) {
       var number = padRight("#${i++}", 8);
-      var member = frame.member.replaceAll("<fn>", "<anonymous closure>");
+      var member = frame.member
+          .replaceAllMapped(new RegExp(r"[^.]+\.<async>"),
+              (match) => "${match[1]}.<${match[1]}_async_body>")
+          .replaceAll("<fn>", "<anonymous closure>");
       var line = frame.line == null ? 0 : frame.line;
       var column = frame.column == null ? 0 : frame.column;
       return "$number$member (${frame.uri}:$line:$column)\n";