Use union type in ImageBitmapFactories.idl

third_party/WebKit/Source/core/imagebitmap/ImageBitmapSource.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 ImageBitmapSource_h
+#define ImageBitmapSource_h
+
+#include "core/CoreExport.h"
+#include "platform/geometry/IntSize.h"
+
+namespace blink {
+
+class CORE_EXPORT ImageBitmapSource {
+public:
+    virtual IntSize bitmapSourceSize() const { return IntSize(); };
+
+    virtual bool isBlob() const { return false; }
+    virtual bool isImageData() const { return false; }
+    virtual bool isHTMLImageElement() const { return false; }
+    virtual bool isHTMLVideoElement() const { return false; }
+    virtual bool isCanvasElement() const { return false; }
+
+protected:
+    virtual ~ImageBitmapSource() {}
+};
+
+} // namespace blink
+
+#endif