<iframe> should expose its mojo::ServiceProvider handle

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 SKY_ENGINE_CORE_HTML_HTMLIFRAMEELEMENT_H_
 #define SKY_ENGINE_CORE_HTML_HTMLIFRAMEELEMENT_H_
 
 #include "gen/sky/core/HTMLNames.h"
 #include "mojo/services/view_manager/public/cpp/view_observer.h"
 #include "sky/engine/core/dom/DOMURLUtils.h"
 #include "sky/engine/core/dom/Document.h"
 #include "sky/engine/core/html/HTMLElement.h"
 #include "sky/engine/wtf/OwnPtr.h"
 
 namespace blink {
 
 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; }
 
+    ScriptValue takeServiceProvider(ScriptState*);
+
 private:
     explicit HTMLIFrameElement(Document&);
 
     // HTMLElement methods:
     virtual RenderObject* createRenderer(RenderStyle* style) override;
 
     virtual void insertedInto(ContainerNode*) override;
     virtual void removedFrom(ContainerNode*) override;
 
     // ViewObserver methods:
     void OnViewDestroyed(mojo::View* view) override;
 
 private:
     void createView();
 
     mojo::View* m_contentView;
+    mojo::ScopedMessagePipeHandle m_serviceProvider;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_HTML_HTMLIFRAMEELEMENT_H_