Print stack traces of tests timing out on Windows

tools/testing/dart/test_runner.dart

Index: tools/testing/dart/test_runner.dart
diff --git a/tools/testing/dart/test_runner.dart b/tools/testing/dart/test_runner.dart
index 1680066f6a7c925f9256b86ee68383bb108f5f1b..e69a6ac2e9daafc532ded4b0ee6484799ba8ff28 100644
--- a/tools/testing/dart/test_runner.dart
+++ b/tools/testing/dart/test_runner.dart
@@ -2008,6 +2008,9 @@ class RunningProcess {
                 // sample the threads once.
                 executable = '/usr/bin/sample';
                 arguments = ['${process.pid}', '1', '4000', '-mayDie'];
+              } else if (io.Platform.isWindows) {
+                executable = "cdb.exe";

[kustermann, 2017/02/02 13:59:23]

How do you ensure the correct version of cdb.exe is used?

We can modify PATH if we know where the two different versions are.

[Florian Schneider, 2017/02/02 18:22:02]

Yes, the correct version has to be in the PATH. I don't want to put any code to
find it here.

+                arguments = ['-p', '${process.pid}', '-c', '!uniqstack;qd'];
               }
 
               if (executable != null) {