Adjust DOMWindow properties to emulate old style pinch semantics

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 1513 matching lines @@
 void FrameView::scrollElementToRect(Element* element, const IntRect& rect)
 {
     // FIXME(http://crbug.com/371896) - This method shouldn't be manually doing
     // coordinate transformations to the PinchViewport.
     IntRect targetRect(rect);
 
     m_frame->document()->updateLayoutIgnorePendingStylesheets();
 
     bool pinchVirtualViewportEnabled = m_frame->settings()->pinchVirtualViewportEnabled();
 
+    // FIXME: This needs an isMainFrame() check as well. crbug.com/378776.
     if (pinchVirtualViewportEnabled) {
         PinchViewport& pinchViewport = m_frame->page()->frameHost().pinchViewport();
 
         IntSize pinchViewportSize = expandedIntSize(pinchViewport.visibleRect().size());
         targetRect.moveBy(ceiledIntPoint(pinchViewport.visibleRect().location()));
         targetRect.setSize(pinchViewportSize.shrunkTo(targetRect.size()));
     }
 
     LayoutRect bounds = element->boundingBox();
     int centeringOffsetX = (targetRect.width() - bounds.width()) / 2;
@@ skipping 2460 matching lines @@
         return;
 
     ScrollableArea::setScrollOrigin(origin);
 
     // Update if the scroll origin changes, since our position will be different if the content size did not change.
     if (updatePositionAtAll && updatePositionSynchronously)
         updateScrollbars(scrollOffsetDouble());
 }
 
 } // namespace blink