<iframe> should expose its mojo::ServiceProvider handle

sky/engine/core/html/HTMLIFrameElement.cpp

 // 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.
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/html/HTMLIFrameElement.h"
 
 #include "gen/sky/core/HTMLNames.h"
+#include "mojo/edk/js/handle.h"
 #include "sky/engine/core/frame/LocalFrame.h"
 #include "sky/engine/core/html/parser/HTMLParserIdioms.h"
 #include "sky/engine/core/loader/FrameLoaderClient.h"
 #include "sky/engine/core/rendering/RenderIFrame.h"
 
 namespace blink {
 
 PassRefPtr<HTMLIFrameElement> HTMLIFrameElement::create(Document& document)
 {
     return adoptRef(new HTMLIFrameElement(document));
@@ skipping 29 matching lines @@
 {
     return new RenderIFrame(this);
 }
 
 void HTMLIFrameElement::OnViewDestroyed(mojo::View* view)
 {
     DCHECK_EQ(view, m_contentView);
     m_contentView = nullptr;
 }
 
+ScriptValue HTMLIFrameElement::takeServiceProvider(ScriptState* scriptState)
+{
+    return ScriptValue(scriptState, gin::ConvertToV8(scriptState->isolate(), m_serviceProvider.release()));
+}
+
 void HTMLIFrameElement::createView()
 {
     String urlString = stripLeadingAndTrailingHTMLSpaces(getAttribute(HTMLNames::srcAttr));
     if (urlString.isEmpty())
         urlString = blankURL().string();
 
     LocalFrame* parentFrame = document().frame();
     if (!parentFrame)
         return;
 
     KURL url = document().completeURL(urlString);
     m_contentView = parentFrame->loaderClient()->createChildFrame();
     if (!m_contentView)
         return;
 
-    m_contentView->Embed(mojo::String::From(url.string().utf8().data()));
+    mojo::MessagePipe pipe;
+    m_serviceProvider = pipe.handle0.Pass();
+    m_contentView->Embed(mojo::String::From(url.string().utf8().data()),
+        mojo::MakeRequest<mojo::ServiceProvider>(pipe.handle1.Pass()));
     m_contentView->AddObserver(this);
 }
 
 }