Fix point conversions in PopupContainer.

Source/web/PopupContainer.cpp

 /*
  * Copyright (c) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 507 matching lines @@
 {
     if (HostWindow* h = hostWindow())
         h->invalidateContentsAndRootView(rect);
 }
 
 HostWindow* PopupContainer::hostWindow() const
 {
     return const_cast<PopupContainerClient*>(m_client);
 }
 
+IntPoint PopupContainer::convertChildToSelf(const Widget* child, const IntPoint& point) const
+{
+    IntPoint newPoint = point;
+    newPoint.moveBy(child->location());
+    return newPoint;
+}
+
+IntPoint PopupContainer::convertSelfToChild(const Widget* child, const IntPoint& point) const
+{
+    IntPoint newPoint = point;
+    newPoint.moveBy(-child->location());
+    return newPoint;
+}
+
 } // namespace blink