Log to UMA when x-origin frames (1) are created and (2) become visible

third_party/WebKit/Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 1077 matching lines @@
     Element* rootScroller() const;
     void setRootScroller(Element*, ExceptionState&);
     RootScrollerController* rootScrollerController() const { return m_rootScrollerController.get(); }
 
     // TODO(bokan): Temporarily added to allow ScrollCustomization to properly
     // opt out for wheel scrolls. crbug.com/623079.
     bool isViewportScrollCallback(const ScrollStateCallback*);
 
     bool isInMainFrame() const;
 
+    void onVisibilityMaybeChanged(bool visible);
+
 protected:
     Document(const DocumentInit&, DocumentClassFlags = DefaultDocumentClass);
 
     void didUpdateSecurityOrigin() final;
 
     void clearXMLVersion() { m_xmlVersion = String(); }
 
     virtual Document* cloneDocumentWithoutChildren();
 
     bool importContainerNodeChildren(ContainerNode* oldContainerNode, ContainerNode* newContainerNode, ExceptionState&);
@@ skipping 302 matching lines @@
 
     Member<IntersectionObserverController> m_intersectionObserverController;
     Member<NodeIntersectionObserverData> m_intersectionObserverData;
     Member<ResizeObserverController> m_resizeObserverController;
 
     int m_nodeCount;
 
     bool m_mayContainV0Shadow = false;
 
     Member<SnapCoordinator> m_snapCoordinator;
+
+    bool m_visibilityWasLogged;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Document>;
 
 inline bool Document::shouldOverrideLegacyDescription(ViewportDescription::Type origin) const
 {
     // The different (legacy) meta tags have different priorities based on the type
     // regardless of which order they appear in the DOM. The priority is given by the
     // ViewportDescription::Type enum.
     return origin >= m_legacyViewportDescription.type;
@@ skipping 29 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h