[DevTools] Added public method for async execution of scripts

public/web/WebScriptCallback.h

+// 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.
+
+#ifndef WebScriptCallback_h
+#define WebScriptCallback_h
+
+namespace v8 {
+class Value;
+template <class T> class Local;
+}
+
+namespace blink {
+
+template <typename T> class WebVector;
+
+class WebScriptCallback {
+public:
+    virtual ~WebScriptCallback() { }
+
+    // After function call all objects in vector will be collected
+    virtual void finished(const WebVector<v8::Local<v8::Value> >&) { }
+};
+
+} // namespace blink
+
+#endif // WebScriptCallback_h