[DevTools] Added public method for async execution of scripts

Source/core/dom/ScriptExecutionCallback.cpp

Index: Source/core/dom/ScriptExecutionCallback.cpp
diff --git a/Source/core/dom/ScriptExecutionCallback.cpp b/Source/core/dom/ScriptExecutionCallback.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..14cccb86ac22a8ecf55134cbfdfae95df4274b50
--- /dev/null
+++ b/Source/core/dom/ScriptExecutionCallback.cpp
@@ -0,0 +1,18 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/dom/ScriptExecutionCallback.h"
+
+namespace blink {
+
+ScriptExecutionCallback::ScriptExecutionCallback()
+{
+}
+
+ScriptExecutionCallback::~ScriptExecutionCallback()
+{
+}
+
+} // namespace blink