Add a separate call to initialize the bounds for a sky <iframe> element.

sky/engine/core/html/HTMLIFrameElement.h

 // 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();
 
+    uint32_t frame_id() const { return frame_id_; }
+
 private:
     explicit HTMLIFrameElement(Document&);
 
     virtual RenderObject* createRenderer(RenderStyle* style) override;
 
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
     virtual void removedFrom(ContainerNode*) override;
 
 private:
     void createView();
+
+    uint32_t frame_id_;
 };
 
 } // namespace blink
 
 #endif // HTMLIFrameElement_h