Initial ResizeObserver implementation

third_party/WebKit/Source/core/observer/ResizeObserverEntry.h

+// Copyright 2016 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 ResizeObserverEntry_h
+#define ResizeObserverEntry_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/observer/ResizeObservation.h"
+#include "platform/geometry/LayoutRect.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Element;
+class DOMRectReadOnly;
+class ClientRect;
+
+class ResizeObserverEntry final : public GarbageCollected<ResizeObserverEntry>, public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+
+public:
+    ResizeObserverEntry(Element* target);
+
+    Element* target() const { return m_target.get(); }
+    // FIXME(atotic): should return DOMReadOnlyRect once GeometryInterfaces land
+    ClientRect* contentRect() const { return m_contentRect; }
+    LayoutSize contentSize() const;
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    Member<Element> m_target;
+    Member<ClientRect> m_contentRect;
+};
+
+} // namespace blink
+
+#endif // ResizeObserverEntry_h