Add debugging output to crash_dump_test to help track down timeout.

runtime/observatory/tests/service/crash_dump_test.dart

Index: runtime/observatory/tests/service/crash_dump_test.dart
diff --git a/runtime/observatory/tests/service/crash_dump_test.dart b/runtime/observatory/tests/service/crash_dump_test.dart
index 8b60567ea19bd8c59bcea9a4c97dd7390659306b..0d9d178cc90cdde34ea900f4c469cf6fcb2617cb 100644
--- a/runtime/observatory/tests/service/crash_dump_test.dart
+++ b/runtime/observatory/tests/service/crash_dump_test.dart
@@ -18,9 +18,11 @@ Future warmup() async {
 var tests = [
   (VM vm) async {
     HttpClient client = new HttpClient();
+    print('Requesting uri ${serviceHttpAddress}/_getCrashDump');
     var request =
         await client.getUrl(Uri.parse('$serviceHttpAddress/_getCrashDump'));
     var response = await request.close();
+    print('Received response');
     Completer completer = new Completer();
     StringBuffer sb = new StringBuffer();
     response.transform(UTF8.decoder).listen((chunk) {