Fire visibilityChange event on out-of-process iframes.

chrome/renderer/prerender/prerender_helper.cc

 // Copyright (c) 2012 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 "chrome/renderer/prerender/prerender_helper.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "chrome/common/prerender_messages.h"
 #include "content/public/renderer/document_state.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 using content::DocumentState;
 
 namespace {
 
 // Updates the visibility state of the RenderFrame.  Must be called whenever
 // prerendering starts or finishes and the page is about to be show.  At both
 // those times, the RenderFrame is hidden.
 void UpdateVisibilityState(content::RenderFrame* render_frame) {
   // TODO(jam): until the prerendering code works on frames instead of views, we
   // have to do this awkward check.
   content::RenderView* render_view = render_frame->GetRenderView();
   if (render_view->GetMainRenderFrame() == render_frame) {
     render_view->GetWebView()->setVisibilityState(
-        render_view->GetVisibilityState(), false);
+        render_frame->GetVisibilityState(), false);
   }
 }
 
 }  // namespace
 
 namespace prerender {
 
 PrerenderHelper::PrerenderHelper(content::RenderFrame* render_frame)
     : content::RenderFrameObserver(render_frame),
       content::RenderFrameObserverTracker<PrerenderHelper>(render_frame) {
@@ skipping 27 matching lines @@
   content::RenderFrame* frame = render_frame();
   // |this| must be deleted so PrerenderHelper::IsPrerendering returns false
   // when the visibility state is updated, so the visibility state string will
   // not be "prerendered".
   delete this;
 
   UpdateVisibilityState(frame);
 }
 
 }  // namespace prerender