Fire visibilityChange event on out-of-process iframes.

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 258 matching lines @@
 
 void WebEmbeddedWorkerImpl::prepareShadowPageForLoader()
 {
     // Create 'shadow page', which is never displayed and is used mainly to
     // provide a context for loading on the main thread.
     //
     // FIXME: This does mostly same as WebSharedWorkerImpl::initializeLoader.
     // This code, and probably most of the code in this class should be shared
     // with SharedWorker.
     DCHECK(!m_webView);
-    m_webView = WebView::create(0);
+    m_webView = WebView::create(nullptr, WebPageVisibilityStateVisible);
     WebSettings* settings = m_webView->settings();
     // FIXME: http://crbug.com/363843. This needs to find a better way to
     // not create graphics layers.
     settings->setAcceleratedCompositingEnabled(false);
     // Currently we block all mixed-content requests from a ServiceWorker.
     // FIXME: When we support FetchEvent.default(), we should relax this
     // restriction.
     settings->setStrictMixedContentChecking(true);
     settings->setAllowDisplayOfInsecureContent(false);
     settings->setAllowRunningOfInsecureContent(false);
@@ skipping 145 matching lines @@
     m_mainScriptLoader.clear();
 
     m_workerGlobalScopeProxy = ServiceWorkerGlobalScopeProxy::create(*this, *document, *m_workerContextClient);
     m_loaderProxy = WorkerLoaderProxy::create(this);
     m_workerThread = ServiceWorkerThread::create(m_loaderProxy, *m_workerGlobalScopeProxy);
     m_workerThread->start(std::move(startupData));
     m_workerInspectorProxy->workerThreadCreated(document, m_workerThread.get(), scriptURL);
 }
 
 } // namespace blink