Correct location adjustment in FrameView::ConvertSelfToChild

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 3633 matching lines @@
   // Convert from FrameView coords into page ("absolute") coordinates.
   point += IntSize(ScrollX(), ScrollY());
 
   return RoundedIntPoint(layout_item.AbsoluteToLocal(point, kUseTransforms));
 }
 
 IntPoint FrameView::ConvertSelfToChild(const FrameOrPlugin& child,
                                        const IntPoint& point) const {
   IntPoint new_point = point;
   new_point = FrameToContents(point);
-  new_point.MoveBy(child.FrameRect().Location());
+  new_point.MoveBy(-child.FrameRect().Location());
   return new_point;
 }
 
 IntRect FrameView::ConvertToContainingFrameViewBase(
     const IntRect& local_rect) const {
   if (parent_) {
     // Get our layoutObject in the parent view
     LayoutPartItem layout_item = frame_->OwnerLayoutItem();
     if (layout_item.IsNull())
       return local_rect;
@@ skipping 1697 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