Add localToAbsoluteTransform and localToAncestorTransform.

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2397 matching lines @@
         LayoutRect containerRect = LayoutRect(containerQuad.boundingBox());
         if (containerRect.isEmpty()) {
             rects.remove(i--);
             continue;
         }
         containerRect.moveBy(postOffset);
         rects[i] = containerRect;
     }
 }
 
+TransformationMatrix LayoutObject::localToAncestorTransform(const LayoutBoxModelObject* ancestor, MapCoordinatesFlags mode, bool* wasFixed) const
+{
+    TransformState transformState(TransformState::ApplyTransformDirection);
+    mapLocalToAncestor(ancestor, transformState, mode | ApplyContainerFlip | UseTransforms, wasFixed);
+    return transformState.accumulatedTransform();
+}
+
 FloatPoint LayoutObject::localToInvalidationBackingPoint(const LayoutPoint& localPoint, PaintLayer** backingLayer)
 {
     const LayoutBoxModelObject& paintInvalidationContainer = containerForPaintInvalidation();
     ASSERT(paintInvalidationContainer.layer());
 
     if (backingLayer)
         *backingLayer = paintInvalidationContainer.layer();
     FloatPoint containerPoint = localToAncestorPoint(FloatPoint(localPoint), &paintInvalidationContainer, TraverseDocumentBoundaries);
 
     // A layoutObject can have no invalidation backing if it is from a detached frame,
@@ skipping 1300 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif