Fire visibilityChange event on out-of-process iframes.

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

Index: third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
index 7c3e78c269685851819ae4adfb9e0d8eb28bede5..b556f7269806ccfd6ad61e31d108aa494e3f0392 100644
--- a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
@@ -274,7 +274,7 @@ void WebEmbeddedWorkerImpl::prepareShadowPageForLoader()
     // 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.