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

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
index 577f4b1d47699a15791ab825be01850f26b38544..c4ce56e5f0679b8b27739b67e438d49432b776ed 100644
--- a/sky/engine/core/html/HTMLIFrameElement.h
+++ b/sky/engine/core/html/HTMLIFrameElement.h
@@ -9,26 +9,39 @@
 #include "core/dom/DOMURLUtils.h"
 #include "core/dom/Document.h"
 #include "core/html/HTMLElement.h"
+#include "mojo/services/public/cpp/view_manager/view_observer.h"
+#include "wtf/OwnPtr.h"
 
 namespace blink {
 
-class HTMLIFrameElement : public HTMLElement {
+class RemoteFrame;
+
+class HTMLIFrameElement : public HTMLElement,
+                          public mojo::ViewObserver {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtr<HTMLIFrameElement> create(Document&);
 
     virtual ~HTMLIFrameElement();
 
+    mojo::View* contentView() const { return m_contentView; }
+
 private:
     explicit HTMLIFrameElement(Document&);
 
+    // HTMLElement methods:
     virtual RenderObject* createRenderer(RenderStyle* style) override;
 
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
     virtual void removedFrom(ContainerNode*) override;
 
+    // ViewObserver methods:
+    void OnViewDestroyed(mojo::View* view) override;
+
 private:
     void createView();
+
+    mojo::View* m_contentView;
 };
 
 } // namespace blink