Basic implementation of <import>

sky/engine/core/html/HTMLImportElement.h

Index: sky/engine/core/html/HTMLImportElement.h
diff --git a/sky/engine/core/html/HTMLImportElement.h b/sky/engine/core/html/HTMLImportElement.h
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+++ b/sky/engine/core/html/HTMLImportElement.h
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+// Copyright 2014 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 HTMLImportElement_h
+#define HTMLImportElement_h
+
+#include "core/html/HTMLElement.h"
+#include "core/html/imports/HTMLImportChildClient.h"
+
+namespace blink {
+
+class HTMLImportElement final : public HTMLElement, public HTMLImportChildClient {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static PassRefPtr<HTMLImportElement> create(Document&);
+
+
+private:
+    explicit HTMLImportElement(Document&);
+
+    bool shouldLoad() const;
+    void load();
+
+    // From HTMLElement
+    InsertionNotificationRequest insertedInto(ContainerNode*) override;
+
+    // From HTMLImportChildClient
+    void didFinish() override;
+    void importChildWasDestroyed(HTMLImportChild*) override;
+    bool isSync() const override;
+    Element* link() override;
+
+    HTMLImportChild* m_child;
+};
+
+} // namespace blink
+
+#endif // HTMLImportElement_h