Fire visibilityChange event on out-of-process iframes.

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index 1b130a7368a06b6ecaefac789f3004d5baecac32..409299b84e28cd4a177c4ca28b0539bc415330fe 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -100,7 +100,7 @@ class WEB_EXPORT WebViewImpl final : WTF_NON_EXPORTED_BASE(public WebView)
     , WTF_NON_EXPORTED_BASE(public WebGestureCurveTarget)
     , public PageWidgetEventHandler {
 public:
-    static WebViewImpl* create(WebViewClient*);
+    static WebViewImpl* create(WebViewClient*, WebPageVisibilityState);
     static HashSet<WebViewImpl*>& allInstances();
 
     // WebWidget methods:
@@ -556,7 +556,7 @@ private:
       DragOver
     };
 
-    explicit WebViewImpl(WebViewClient*);
+    explicit WebViewImpl(WebViewClient*, WebPageVisibilityState);
     ~WebViewImpl() override;
 
     int textInputFlags();