Fix hit testing to be aware of inert inlines.

Source/core/rendering/RenderObject.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 2938 matching lines @@
     }
 
     rect.inflate(outlineSize);
 }
 
 AnimationController* RenderObject::animation() const
 {
     return frame()->animation();
 }
 
+bool RenderObject::isInert() const
+{
+    const RenderObject* renderer = this;
+    while (!renderer->node())
+        renderer = renderer->parent();
+    const Node* parentNode = renderer->node();
+    while (parentNode && !parentNode->isElementNode())
+        parentNode = parentNode->parentNode();
+    return parentNode && toElement(parentNode)->isInert();
+}
+
 void RenderObject::imageChanged(CachedImage* image, const IntRect* rect)
 {
     imageChanged(static_cast<WrappedImagePtr>(image), rect);
 }
 
 Element* RenderObject::offsetParent() const
 {
     if (isRoot() || isBody())
         return 0;
 
@@ skipping 213 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif