Fire visibilityChange event on out-of-process iframes.

third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp

 /*
  * Copyright (C) 2009 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 109 matching lines @@
         m_workerThread->terminate();
     m_workerInspectorProxy->workerThreadTerminated();
 }
 
 void WebSharedWorkerImpl::initializeLoader()
 {
     // Create 'shadow page'. This page is never displayed, it is used to proxy the
     // loading requests from the worker context to the rest of WebKit and Chromium
     // infrastructure.
     DCHECK(!m_webView);
-    m_webView = WebView::create(0);
+    m_webView = WebView::create(nullptr, WebPageVisibilityStateVisible);
     // FIXME: http://crbug.com/363843. This needs to find a better way to
     // not create graphics layers.
     m_webView->settings()->setAcceleratedCompositingEnabled(false);
     // FIXME: Settings information should be passed to the Worker process from Browser process when the worker
     // is created (similar to RenderThread::OnCreateNewView).
     m_mainFrame = toWebLocalFrameImpl(WebLocalFrame::create(WebTreeScopeType::Document, this));
     m_webView->setMainFrame(m_mainFrame.get());
     m_mainFrame->setDevToolsAgentClient(this);
 
     // If we were asked to pause worker context on start and wait for debugger then it is the good time to do that.
@@ skipping 258 matching lines @@
     if (devtoolsAgent)
         devtoolsAgent->dispatchOnInspectorBackend(sessionId, callId, method, message);
 }
 
 WebSharedWorker* WebSharedWorker::create(WebSharedWorkerClient* client)
 {
     return new WebSharedWorkerImpl(client);
 }
 
 } // namespace blink