Factor out NullExecutionContext from unittest files.

Source/core/testing/NullExecutionContext.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 NullExecutionContext_h
+#define NullExecutionContext_h
+
+#include "core/dom/ExecutionContext.h"
+#include "core/dom/SecurityContext.h"
+#include "core/events/EventQueue.h"
+#include "platform/heap/Handle.h"
+#include "platform/weborigin/KURL.h"
+#include "wtf/RefCounted.h"
+
+namespace WebCore {
+
+class NullExecutionContext FINAL : public RefCountedWillBeGarbageCollectedFinalized<NullExecutionContext>, public SecurityContext, public ExecutionContext {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NullExecutionContext);
+public:
+    NullExecutionContext();
+
+    virtual EventQueue* eventQueue() const OVERRIDE { return m_queue.get(); }
+
+    virtual bool tasksNeedSuspension() OVERRIDE { return m_tasksNeedSuspension; }
+    void setTasksNeedSuspension(bool flag) { m_tasksNeedSuspension = flag; }
+
+    void trace(Visitor* visitor)
+    {
+        visitor->trace(m_queue);
+        ExecutionContext::trace(visitor);
+    }
+
+    virtual void reportBlockedScriptExecutionToInspector(const String& directiveText) OVERRIDE { }
+    virtual SecurityContext& securityContext() OVERRIDE { return *this; }
+
+#if !ENABLE(OILPAN)
+    using RefCounted<NullExecutionContext>::ref;
+    using RefCounted<NullExecutionContext>::deref;
+
+    virtual void refExecutionContext() OVERRIDE { ref(); }
+    virtual void derefExecutionContext() OVERRIDE { deref(); }
+#endif
+
+protected:
+    virtual const KURL& virtualURL() const OVERRIDE { return m_dummyURL; }
+    virtual KURL virtualCompleteURL(const String&) const OVERRIDE { return m_dummyURL; }
+
+private:
+    bool m_tasksNeedSuspension;
+    OwnPtrWillBeMember<EventQueue> m_queue;
+
+    KURL m_dummyURL;
+};
+
+} // namespace WebCore
+
+#endif // NullExecutionContext_h