Ensure RemoteViewportIntersection rect persists across frame navigations

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
@@ skipping 1183 matching lines @@
     DCHECK(GetDocument());
     node = GetDocument()->FocusedElement();
   }
 
   if (node) {
     return node->GetWebPluginContainerBase();
   }
   return nullptr;
 }
 
+void LocalFrame::SetViewportIntersectionFromParent(
+    const IntRect& viewport_intersection) {
+  if (remote_viewport_intersection_ != viewport_intersection) {
+    remote_viewport_intersection_ = viewport_intersection;
+    if (View())
+      View()->ScheduleAnimation();
+  }
+}
+
 }  // namespace blink