First version of PerformanceObserver

Source/bindings/core/v8/V8PerformanceObserverCallback.h

+// Copyright 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 V8PerformanceObserverCallback_h
+#define V8PerformanceObserverCallback_h
+
+#include "bindings/core/v8/ActiveDOMCallback.h"
+#include "bindings/core/v8/DOMWrapperWorld.h"
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "core/CoreExport.h"
+#include "core/timing/PerformanceObserverCallback.h"
+
+namespace blink {
+
+class V8PerformanceObserverCallback final : public PerformanceObserverCallback, public ActiveDOMCallback {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(V8PerformanceObserverCallback);
+public:
+    static V8PerformanceObserverCallback* create(v8::Local<v8::Function> callback, v8::Local<v8::Object> owner, ScriptState* scriptState)
+    {
+        return new V8PerformanceObserverCallback(callback, owner, scriptState);
+    }
+
+    ~V8PerformanceObserverCallback() override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+    void handleEvent(PerformanceObserverEntryList*, PerformanceObserver*) override;
+    ExecutionContext* executionContext() const override { return ContextLifecycleObserver::executionContext(); }
+private:
+    CORE_EXPORT V8PerformanceObserverCallback(v8::Local<v8::Function>, v8::Local<v8::Object>, ScriptState*);
+
+    static void setWeakCallback(const v8::WeakCallbackInfo<V8PerformanceObserverCallback>&);
+
+    ScopedPersistent<v8::Function> m_callback;
+    RefPtr<ScriptState> m_scriptState;
+};
+
+}
+#endif // V8PerformanceObserverCallback_h