Ensure RemoteViewportIntersection rect persists across frame navigations

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 5264 matching lines @@
             .c_str());
     return result;
   }
 
   String result(MainThreadScrollingReason::mainThreadScrollingReasonsAsText(
                     main_thread_scrolling_reasons_)
                     .c_str());
   return result;
 }
 
-void FrameView::SetViewportIntersectionFromParent(
-    const IntRect& viewport_intersection) {
-  if (remote_viewport_intersection_ != viewport_intersection) {
-    remote_viewport_intersection_ = viewport_intersection;
-    ScheduleAnimation();
-  }
-}
-
 IntRect FrameView::RemoteViewportIntersection() {
-  IntRect intersection(remote_viewport_intersection_);
+  IntRect intersection(GetFrame().RemoteViewportIntersection());
   intersection.Move(ScrollOffsetInt());
   return intersection;
 }
 
 void FrameView::MapQuadToAncestorFrameIncludingScrollOffset(
     LayoutRect& rect,
     const LayoutObject* descendant,
     const LayoutView* ancestor,
     MapCoordinatesFlags mode) {
   FloatQuad mapped_quad = descendant->LocalToAncestorQuad(
@@ skipping 44 matching lines @@
 void FrameView::SetAnimationHost(
     std::unique_ptr<CompositorAnimationHost> host) {
   animation_host_ = std::move(host);
 }
 
 LayoutUnit FrameView::CaretWidth() const {
   return LayoutUnit(GetChromeClient()->WindowToViewportScalar(1));
 }
 
 }  // namespace blink