Initial work on a new <view> element backed by a mojo::View.

sky/engine/core/html/HTMLIFrameElement.h

Index: sky/engine/core/html/HTMLIFrameElement.h
diff --git a/sky/engine/core/html/HTMLIFrameElement.h b/sky/engine/core/html/HTMLIFrameElement.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 HTMLIFrameElement_h
+#define HTMLIFrameElement_h
+
+#include "core/HTMLNames.h"
+#include "core/dom/DOMURLUtils.h"
+#include "core/dom/Document.h"
+#include "core/html/HTMLElement.h"
+
+namespace blink {
+
+class HTMLIFrameElement : public HTMLElement {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static PassRefPtr<HTMLIFrameElement> create(Document&);
+
+    virtual ~HTMLIFrameElement();
+
+private:
+    explicit HTMLIFrameElement(Document&);
+
+    virtual RenderObject* createRenderer(RenderStyle* style) override;
+
+    virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
+    virtual void removedFrom(ContainerNode*) override;
+
+private:
+    void createView();
+};
+
+} // namespace blink
+
+#endif // HTMLIFrameElement_h