[bindings] Refactor ScriptStateForTesting, V8TestingScope into V8BindingForTesting.h/cpp

Source/bindings/core/v8/V8BindingForTesting.h

+// Copyright (c) 2015 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 V8BindingForTesting_h
+#define V8BindingForTesting_h
+
+#include "bindings/core/v8/DOMWrapperWorld.h"
+#include "bindings/core/v8/ScriptState.h"
+#include "wtf/Forward.h"
+
+#include <v8.h>
+
+namespace blink {
+
+class ScriptStateForTesting : public ScriptState {
+public:
+    static PassRefPtr<ScriptStateForTesting> create(v8::Handle<v8::Context>, PassRefPtr<DOMWrapperWorld>);
+    virtual ExecutionContext* executionContext() const override;
+    virtual void setExecutionContext(ExecutionContext*) override;
+private:
+    ScriptStateForTesting(v8::Handle<v8::Context>, PassRefPtr<DOMWrapperWorld>);
+    ExecutionContext* m_executionContext;
+};
+
+class V8TestingScope {
+public:
+    explicit V8TestingScope(v8::Isolate*);
+    ScriptState* scriptState() const;
+    v8::Isolate* isolate() const;
+    ~V8TestingScope();
+
+private:
+    v8::HandleScope m_handleScope;
+    v8::Context::Scope m_contextScope;
+    RefPtr<ScriptState> m_scriptState;
+};
+
+} // namespace blink
+
+#endif // V8BindingForTesting_h