ResizeObserver pt1: IDLs with stubs

third_party/WebKit/Source/core/observer/ResizeObserverCallback.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 ResizeObserverCallback_h
+#define ResizeObserverCallback_h
+
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class ExecutionContext;
+class ResizeObserver;
+class ResizeObserverEntry;
+
+class ResizeObserverCallback : public GarbageCollectedFinalized<ResizeObserverCallback> {
+public:
+    virtual ~ResizeObserverCallback() {}
+    virtual void handleEvent(const HeapVector<Member<ResizeObserverEntry>>& entries, ResizeObserver*) = 0;
+    DEFINE_INLINE_VIRTUAL_TRACE() { }
+};
+
+} // namespace blink
+
+#endif // ResizeObserverCallback_h