Ensure RemoteViewportIntersection rect persists across frame navigations

third_party/WebKit/Source/core/frame/LocalFrame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 235 matching lines @@
   static void RegisterInitializationCallback(FrameInitCallback);
 
   // If the frame hosts a PluginDocument, this method returns the
   // WebPluginContainerBase that hosts the plugin. If the provided node is a
   // plugin, then it returns its WebPluginContainerBase. Otherwise, uses the
   // currently focused element (if any).
   // TODO(slangley): Refactor this method to extract the logic of looking up
   // focused element or passed node into explicit methods.
   WebPluginContainerBase* GetWebPluginContainerBase(Node* = nullptr) const;
 
+  // Called on a view for a LocalFrame with a RemoteFrame parent. This makes
+  // viewport intersection available that accounts for remote ancestor frames
+  // and their respective scroll positions, clips, etc.
+  void SetViewportIntersectionFromParent(const IntRect&);
+  IntRect RemoteViewportIntersection() { return remote_viewport_intersection_; }
+
  private:
   friend class FrameNavigationDisabler;
 
   LocalFrame(LocalFrameClient*,
              Page&,
              FrameOwner*,
              InterfaceProvider*,
              InterfaceRegistry*);
 
   // Intentionally private to prevent redundant checks when the type is
@@ skipping 28 matching lines @@
   float page_zoom_factor_;
   float text_zoom_factor_;
 
   bool in_view_source_mode_;
 
   Member<CoreProbeSink> probe_sink_;
   Member<PerformanceMonitor> performance_monitor_;
 
   InterfaceProvider* const interface_provider_;
   InterfaceRegistry* const interface_registry_;
+
+  IntRect remote_viewport_intersection_;
 };
 
 inline FrameLoader& LocalFrame::Loader() const {
   return loader_;
 }
 
 inline NavigationScheduler& LocalFrame::GetNavigationScheduler() const {
   DCHECK(navigation_scheduler_);
   return *navigation_scheduler_.Get();
 }
@@ skipping 81 matching lines @@
   explicit ScopedFrameBlamer(LocalFrame*);
   ~ScopedFrameBlamer();
 
  private:
   Member<LocalFrame> frame_;
 };
 
 }  // namespace blink
 
 #endif  // LocalFrame_h