Implement accessibility support for CSS-transformed iframes.

third_party/WebKit/Source/modules/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 1064 matching lines @@
     for (const auto& child : m_children)
         child->markCachedElementRectDirty();
 }
 
 IntPoint AXObject::clickPoint()
 {
     LayoutRect rect = elementRect();
     return roundedIntPoint(LayoutPoint(rect.x() + rect.width() / 2, rect.y() + rect.height() / 2));
 }
 
+SkMatrix44 AXObject::transformFromLocalParentFrame() const
+{
+    return SkMatrix44();
+}
+
 IntRect AXObject::boundingBoxForQuads(LayoutObject* obj, const Vector<FloatQuad>& quads)
 {
     ASSERT(obj);
     if (!obj)
         return IntRect();
 
     size_t count = quads.size();
     if (!count)
         return IntRect();
 
@@ skipping 590 matching lines @@
 
 DEFINE_TRACE(AXObject)
 {
     visitor->trace(m_children);
     visitor->trace(m_parent);
     visitor->trace(m_cachedLiveRegionRoot);
     visitor->trace(m_axObjectCache);
 }
 
 } // namespace blink