Don't apply container flip when computing offset to transformed ancestor.

third_party/WebKit/Source/core/paint/PaintLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 886 matching lines @@
     PaintLayer* curr = parent();
     while (curr && !curr->isRootLayer() && !curr->layoutObject()->hasTransformRelatedProperty())
         curr = curr->parent();
 
     return curr;
 }
 
 LayoutPoint PaintLayer::computeOffsetFromTransformedAncestor() const
 {
     TransformState transformState(TransformState::ApplyTransformDirection, FloatPoint());
-    // FIXME: add a test that checks flipped writing mode and ApplyContainerFlip are correct.
-    layoutObject()->mapLocalToAncestor(transformAncestor() ? transformAncestor()->layoutObject() : nullptr, transformState, ApplyContainerFlip);
+    layoutObject()->mapLocalToAncestor(transformAncestor() ? transformAncestor()->layoutObject() : nullptr, transformState, 0);
     transformState.flatten();
     return LayoutPoint(transformState.lastPlanarPoint());
 }
 
 PaintLayer* PaintLayer::compositingContainer() const
 {
     if (!stackingNode()->isStacked())
         return parent();
     if (PaintLayerStackingNode* ancestorStackingNode = stackingNode()->ancestorStackingContextNode())
         return ancestorStackingNode->layer();
@@ skipping 1994 matching lines @@
 
 void showLayerTree(const blink::LayoutObject* layoutObject)
 {
     if (!layoutObject) {
         fprintf(stderr, "Cannot showLayerTree. Root is (nil)\n");
         return;
     }
     showLayerTree(layoutObject->enclosingLayer());
 }
 #endif