Initial ResizeObserver implementation

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

Index: third_party/WebKit/Source/core/observer/ResizeObserverEntry.h
diff --git a/third_party/WebKit/Source/core/observer/ResizeObserverEntry.h b/third_party/WebKit/Source/core/observer/ResizeObserverEntry.h
new file mode 100644
index 0000000000000000000000000000000000000000..f5ad799f45e7f3c0778d409b75253fe07e0557e2
--- /dev/null
+++ b/third_party/WebKit/Source/core/observer/ResizeObserverEntry.h
@@ -0,0 +1,39 @@
+// 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;
+    LayoutSize contentSize() const;
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    Member<Element> m_target;
+    LayoutRect m_contentRect;

[szager1, 2016/07/11 18:33:47]

This should be stored as a ClientRect*, because we need to preserve its identity
in javascript, i.e.:

entry.contentRect() === entry.contentRect();

[atotic1, 2016/07/11 23:18:58]

Did not think of that. Thanks.

+};
+
+} // namespace blink
+
+#endif // ResizeObserverEntry_h