[inspector] test for fixed empty stack processing in console.count

test/inspector/debugger/async-console-count-doesnt-crash.js

Index: test/inspector/debugger/async-console-count-doesnt-crash.js
diff --git a/test/inspector/debugger/async-console-count-doesnt-crash.js b/test/inspector/debugger/async-console-count-doesnt-crash.js
new file mode 100644
index 0000000000000000000000000000000000000000..8eace1eaa61193156360f07d2fff1e4caabf6060
--- /dev/null
+++ b/test/inspector/debugger/async-console-count-doesnt-crash.js
@@ -0,0 +1,10 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+print("setTimeout(console.count, 0) doesn't crash with enabled async stacks.")
+
+InspectorTest.sendCommand("Debugger.enable", {});
+InspectorTest.sendCommand("Debugger.setAsyncCallStackDepth", { maxDepth: 1 });
+InspectorTest.sendCommand("Runtime.evaluate", { expression: "setTimeout(console.count, 0)" });
+InspectorTest.completeTestAfterPendingTimeouts();